Patent Publication Number: US-7913302-B2

Title: Advanced responses to online fraud

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation-in-part of, and claims the benefit of, U.S. patent application Ser. No. 10/709,398 filed May 2, 2004 by Shraim et al. and entitled “Online Fraud Solution,” the entire disclosure of which is incorporated herein by reference for all purposes. This application also claims the benefit of the following provisional applications, the entire disclosures of which are incorporated herein by reference for all purposes: U.S. Prov. App. No. 60/615,973, filed Oct. 4, 2004 by Shraim et al. and entitled “Online Fraud Solution”; U.S. Prov. App. No. 60/610,716, filed Sep. 17, 2004 by Shull and entitled “Methods and Systems for Preventing Online Fraud”; and U.S. Prov. App. No. 60/610,715, filed Sep. 17, 2004 by Shull et al. and entitled “Customer-Based Detection of Online Fraud.” 
    
    
     COPYRIGHT NOTICE 
     A portion of the disclosure of this patent document contains material that is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever. 
     This application is also related to the following commonly-owned, copending applications, each of which is filed on a date even herewith and is incorporated by reference herein for all purposes: U.S. patent application Ser. No. 10/996,991, filed Nov. 23, 2004 by Shraim et al. and entitled “Online Fraud Solution”; U.S. patent application Ser. No. 10/996,567, filed Nov. 23, 2004 by Shraim et al. and entitled “Enhanced Responses to Online Fraud”; U.S. patent application Ser. No. 10/996,990, filed Nov. 23, 2004 by Shraim et al., and entitled “Customer-Based Detection of Online Fraud”; U.S. patent application Ser. No. 10/996,566, filed Nov. 23, 2004 by Shraim et al. and entitled “Early Detection and Monitoring of Online Fraud”; U.S. patent application Ser. No. 10/996,646, filed Nov. 23, 2004 by Shraim et al. and entitled “Enhanced Responses to Online Fraud”; U.S. patent application Ser. No. 10/996,568, filed Nov. 23, 2004 by Shraim et al. and entitled “Generating Phish Messages”; and U.S. patent application Ser. No. 10/997,626, filed Nov. 23, 2004 by Shraim et al. and entitled “Methods and Systems for Analyzing Data Related to Possible Online Fraud”. 
     BACKGROUND OF THE INVENTION 
     The present invention relates computer systems, and more particularly to systems, methods and software for detecting, preventing, responding to and/or otherwise dealing with online fraud. 
     Electronic mail (“email”) has become a staple of modern communications. Unfortunately, however, anyone who uses email on a regular basis is familiar with the vast quantities of “spam” (unsolicited email) sent to nearly every email addressee from various advertisers. Although somewhat analogous to traditional paper “junk mail,” spam is unique in that, for virtually no cost, a purveyor of spam (“spammer”) can easily and quickly generate and transmit copious amounts of spam. Further, limitations in the Internet-standard simple mail transport protocol (“SMTP”) allow spammers to transmit spam with relative anonymity and, therefore, with correspondingly little accountability. Consequently, even though spam annoys the vast majority of recipients and, thus, generates few successful sales opportunities for the spammer relative to the amount of spam transmitted, the spam “industry” is burgeoning: Given their ability to inexpensively and quickly transmit enormous quantities of spam, spammers can make a handsome profit even from the relatively low response rate to the spam advertising. 
     By their nature, spammers continually search for new recipients (victims) to which to send spam. The spam “industry,” therefore has launched a derivative industry of “harvesters,” who scour the Internet and other sources to generate lists of valid email addresses, which they then sell to the spammers. (Obviously, since these activities go hand-in-hand, many spammers act as harvesters for themselves or their fellow spammers). Harvesters use a variety of techniques for obtaining email address lists, and often develop automated search programs (commonly referred to as “robots” or “webcrawlers”) that continually skulk about the Internet searching for new email addresses. For example, harvesters obtain email addresses from Internet (and other) news groups, chat rooms, and directory service (e.g., white pages) sites, as well as message boards, mailing lists, and web pages, on which users commonly provide email addresses for feedback, etc. 
     The success of spam as a marketing technique has begun to result in the use of spam to perpetrate “phishing” operations. A phishing operation can be defined as any type of social engineering attack (typically relying the illegitimate use of a brand name) to induce a consumer to take an action that he/she otherwise would not take. Phishing scams can operate by bribery, flattery, deceit, cajoling and through other methods. Phishing operations often involve mass contact of consumers (for example, by “spam” email messages, text messages, VoIP calls, instant messages, etc. as well as through other devices) and generally direct contacted consumers to a response site, which often is a web site but can also be a telephone number, etc. 
     One fairly common example of a phishing scam is a spam email message advertising a well-known software application or package (which in fact was pirated or otherwise obtained illegitimately) at a greatly reduced price, and directing respondents to a web site where the software can be purchased. Upon visiting the site, consumers would (or should) know that the advertised price is grossly unrealistic and probably indicates some time of illegitimacy, such as black- or gray-market goods. Some consumers, however, either out of ignorance or willful blindness, will accept the phisher&#39;s assurances that the software is legitimate and therefore will purchase the illegitimate software, completing the phishing scam. 
     Another common phishing operation is known as a “spoofing” scam. This practice involves inserting a false email address in the “From” or “Reply-to” headers of an email message, thereby misleading the recipient into believing that the email originated from a relatively trusted source. Spoofed emails often appear to be from well-known Internet service providers (“ISPs”) (such as, for example, America Online™ and The Microsoft Network™), or other high-profile entities with easily-identifiable email addresses (including, for example IBM™, Microsoft™, General Motors™ and E-Bay™, as well as various financial institutions, online retailers and the like). This spoofing is unacceptable to these entities for many reasons, not the least because it causes customer confusion, destroys the value of a well-cultivated online presence, creates general mistrust of the spoofed brands and largely dilutes the value of a reputable entity&#39;s online communications and transactions. 
     Further, in many cases, spammers and/or spoofers have developed avenues of disseminating information amongst their “industry,” including a variety of online fora such as message boards, chat rooms, newsgroups, and the like. At such locations, spammers often discuss strategies for more effective spamming/spoofing, new spoof sites, etc., as well as trade and/or advertise lists of harvested addresses. By using these resources, spammers and/or spoofers can focus on the most effective spamming/spoofing techniques, learn from and/or copy the spoofed web sites of others, and the like. Such resources also allow a new spammer or spoofer to quickly pick up effective spamming and/or spoofing techniques. 
     Perhaps most alarmingly, spam (and spoofed spam in particular) has increasingly been used to promote fraudulent activity such as phishing attacks, including identity theft, unauthorized credit card transactions and/or account withdrawals, and the like. This technique involves masquerading as a trusted business in order to induce an unsuspecting consumer to provide confidential personal information, often in response to a purported request to update account information, confirm an online transaction, etc. Merely by way of example, a spoofer may send a spoof email purporting to be from the recipient&#39;s bank and requesting (ironically) that the recipient “confirm” her identity by providing confidential information by reply email or by logging on to a fraudulent web site. Similarly, a common spoofed message requests that the recipient log on to a well-known e-commerce site and “update” credit card information stored by that site. 
     Spam messages (and in particular those that are part of a phishing scheme) often include a uniform resource locator (“URL”) linking to the web site of the phisher. The web site may, for example, be a response point for the sale of illegitimate goods. In other cases, the URL may be configured to appear to be associated with the web site of a spoofed sender, but may actually redirects the recipient to a spoofed web site (i.e., a web site that imitates or is designed to look like the web site of the spoofed source of the email). Upon visiting the spoofed web site, the recipient may be presented with a form that requests information such as the recipient&#39;s address, phone number, social security number, bank account number, credit card number, mother&#39;s maiden name, etc. The recipient, believing that she is communicating with a trusted company, may provide some or all of this information, which then is at the spammer&#39;s disposal to use for any of a variety of illegitimate purposes. (In some cases, the link may be configured to present a legitimate web site, with an illegitimate and/or spoofed popup window presented over the legitimate web site with instructions to provide personal information, etc., which will be collected by the phisher) 
     Thus, phishing scams and other illegitimate online activities have flourished. While such activity is indisputably both illegal and immoral, the relative anonymity of the phishers, as well as the international nature of the Internet, hinders effective legal prosecution for these activities. Merely by way of example, the server associated with a fraudulent web site may be located in a country from which prosecution/extradition is highly unlikely. Moreover, these fraudulent web sites are often highly transient, existing on a given server or ISP for a short time (perhaps only a matter of days or even hours) before the phisher moves on to a new server or ISP. Compounding the enforcement problem is the fact that many of the servers hosting fraudulent web sites are legitimate servers that have been compromised (or “hacked”) by the phisher or his associates, with the owner/operator of the server having no idea that the server is secretly being used for illegitimate purposes. 
     Accordingly, there is a need for efficient solutions to deal with these abuses. 
     BRIEF SUMMARY 
     Various embodiments of the invention provide solutions (including inter alia, systems, methods and software) for dealing with online fraud. In particular, various embodiments of the invention provide advanced responses to an identified instance of online fraud. Such advanced responses can incorporate one or more of a variety of strategies for defeating an attempt by a server to filter and/or otherwise avoid responses to its fraudulent activity. Merely by way of example, in accordance with some embodiments, one or more HTTP responses to a server&#39;s request (such as an online form, etc.) may be submitted and/or transmitted for reception by the server. In some cases, each of the submitted responses may appear to comprise valid information responsive to the server&#39;s request. In other cases, one or more countermeasures may be implemented to defeat an attempt by a phisher (or any other operator of an illegitimate server) to filter responses. 
     One set of embodiments provides methods, including without limitation methods of combating online fraud. An exemplary method comprises creating a plurality of HTTP responses for transmission to a web server. Each of the responses may appear to comprise valid information responsive to a request from a web server (such as an Online form, etc. The method may further comprise transmitting the plurality of HTTP responses for reception by the web server. In some cases, this can comprise transmitting each of the responses from one of a plurality of diverse IP addresses (e.g., from a plurality of computers each having one of the plurality of IP addresses and/or from a computer, such as a megaproxy, etc. configured to use a plurality of IP addresses). 
     In a particular embodiment, the method further comprises determining that a server is engaged in a fraudulent activity. This determination may be made using any of the procedures described below and/or in the applications incorporated by reference. Merely by way of example, in some embodiments, the web server may be interrogated to make this determination. 
     In other embodiments, one or more countermeasures may be implemented. Such countermeasures can impair an attempt to filter and/or block the plurality of HTTP responses. Merely by way of example, the method can comprise receiving one or more electronic messages (which may include, for example, a URL referencing a web site hosted by the web server), and the countermeasure can include parsing the message to determine at least one piece of information to be submitted with one or more of the responses. Examples of such information can include, without limitation, an electronic mail address (e.g., of an intended recipient of the message), a response code, etc. In some cases, a plurality of electronic messages may be received. 
     The messages can be analyzed, e.g., to determine at least one similarity between the messages, and the method can also include ensuring that each of the responses accounts for the at least one similarity. Merely by way of example, if each of the messages was transmitted for an intended recipient, and all of the recipients had a common domain name (e.g., “user1@domain.com,” “user2@domain.com,” etc.) the responses each might include a reference to a user at that domain (although not necessarily to the same user or even to users who were the intended recipients). The reference could be, again merely by way of example, the inclusion of an email address in the response. 
     Another countermeasure can comprise analyzing an embedded test on a web page hosted by the web server. The embedded test may be used by the server (and/or the perpetrator of a fraudulent activity) to validate responses. The method, then, can comprise ensuring that each of the responses does not violate the embedded test. Yet another countermeasure can comprise ensuing that one or more data elements of a response complies with a known standard (such as formatting for credit card numbers, etc.) that applies to that data element. 
     Another exemplary method can comprise identifying (perhaps with a computer) an online form served by a web server (such as an HTML form on a web page hosted by the server, etc.) and used to perpetrate a fraudulent activity. The online form may be analyzed to determine a plurality of fields by which the online form collects data from a user. In accordance with some embodiments, a response to the online form can be created. The response may, in some cases, comprise a plurality of data elements corresponding to the plurality of fields. The method may include verifying that at least one of the data elements does not violate a test used by the web server to filter responses to the online form, and/or may include transmitting the response for reception by the web server. Optionally, the method may include determining that the web server is engaged in a fraudulent activity. 
     In a particular embodiment, the response may comprise safe data associated with a fictitious identity, and/or the safe data may appear to comprise a valid response to an online form. The safe data may also be associated with an account at a financial institution. Hence, in some cases, the method can further comprise monitoring the account at the financial institution for use, which might indicate an attempted online fraud, and/or tracing the sue to identify a perpetrator of the attempted online fraud. 
     An exemplary method of responding to a web site can comprise receiving an electronic message comprising a URL referencing a web site, accessing the web site referenced by the URL, and/or downloading an online form provided by the web site. The online form may comprise a plurality of fields configured to allow a user to provide information to the web site. The method, in some cases, can also include identifying a test on the web site. The test, for example, may be designed to identify a user by reference to an electronic message transmitted by an operator of the web site (who may be a different entity than the operator of a server hosting the web site, for instance, in cases where the server has been compromised) and comprising a URL referencing the web site. 
     A set of safe data may be created; the set of safe date might comprise a plurality of data elements, each of which corresponds to one of the online form&#39;s fields. The method can further comprise ensuring that the set of safe data does not violate the test on the web site, e.g., by identifying a user to whom the operator of the web site believes an electronic message was transmitted. Optionally, the set of safe data may be transmitted for reception by the web site (e.g., as a response to an online form). In some cases, a plurality of sets of safe data may be created and/or transmitted. In other cases, to ensure that the set of safe data does not violate the test on the web site, the safe data may be transmitted using the identity of a user to whom the operator of the web site believes an electronic message was transmitted (for example, by providing information in the response that identifies such a user, such as an email address, name, etc.). 
     If a plurality of electronic messages are received, the method can include identifying a similarity among the plurality of received electronic messages (such as those described elsewhere herein), and/or ensuring that the set of safe data is consistent with the identified similarity among the plurality of electronic messages. Merely by way of example, if the plurality of electronic messages were transmitted for reception by recipients at a particular domain, identifying the similarity among the plurality of messages can comprise identifying the particular domain. As another example, if each of the plurality of electronic messages comprises a response code generated by an algorithm, identifying the similarity among the plurality of electronic messages may comprises identifying the algorithm responsible for generating the response code in each of the plurality of messages. In such cases, the method can include ensuring that the data set comprises a data element corresponding to a response code generated from the algorithm. 
     Some embodiments provide methods for analyzing an online form. One such method can comprise accessing a web site and/or downloading from the web site an online form, which may comprise a plurality of fields corresponding to information requested by the web site. The method may include identifying an embedded test associated with the online form. Further, in some cases, a set of safe data may be created. The set of safe data may comprise a plurality of data elements, each of which may comprise information corresponding to one of the plurality of the online form&#39;s fields. In some cases, one or more of the data elements comprises a response that conforms with the embedded test. 
     The embedded test may be implemented (e.g., by a phisher) in a variety of ways. Merely by way of example, the embedded test may be incorporated within the online form and/or a web page comprising the online form (e.g., as portable code, such as a Java applet, etc.). Alternatively and/or in addition, the embedded test may be incorporated within an electronic message directing users to the web site (e.g., by including in the message a URL referencing the web site). The embedded test may reside on the web site itself (e.g., in a CGI program, server-side script, etc.). Hence, in particular cases, the executable code may be a Java applet, a JavaScript, a CGI application, etc. In other cases, the embedded test may implement one or more of a variety of tracking devices and/or other devices known in the art, including without limitation cookies, timers, counters, hash functions, etc. 
     Other sets of embodiments provide systems and/or software programs, including without limitation systems configured to perform methods of the invention and/or software programs comprising instructions executable by one or more computers to perform methods of the invention. Merely by way of example, an exemplary system comprises a processor and instructions executable by the processor to perform one or more of the methods described above. As another example, a software program (which can be embodied on a computer readable medium) may comprise instructions executable by one or more computers to perform one or more of the methods described above. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A further understanding of the nature and advantages of the present invention may be realized by reference to the figures which are described in remaining portions of the specification. In the figures, like reference numerals are used throughout several to refer to similar components. In some instances, a sub-label consisting of a lower case letter is associated with a reference numeral to denote one of multiple similar components. When reference is made to a reference numeral without specification to an existing sub-label, it is intended to refer to all such multiple similar components. 
         FIG. 1A  is a functional diagram illustrating a system for combating online fraud, in accordance with various embodiments of the invention; 
         FIG. 1B  is a functional diagram illustrating a system for planting bait email addresses, in accordance with various embodiments of the invention; 
         FIG. 2  is a schematic diagram illustrating a system for combating online fraud, in accordance with various embodiments of the invention; 
         FIG. 3  is a generalized schematic diagram of a computer that may be implemented in a system for combating online fraud, in accordance with various embodiments of the invention; 
         FIGS. 4A ,  4 B and  4 C are process flow diagrams illustrating various methods for obtaining information about possible fraudulent activities, in accordance with various embodiments of the invention; 
         FIG. 5A  is a process flow diagram illustrating a method of collecting and analyzing data, in accordance with various embodiments of the invention; 
         FIG. 5B  is a process flow diagram illustrating procedures for analyzing a uniform resource locator and/or a web site, in accordance with various embodiments of the invention; 
         FIG. 6  is a process flow diagram illustrating a method of combating online fraud, in accordance with various embodiments of the invention; 
         FIG. 7  is a process flow diagram illustrating a method of investigating a suspicious uniform resource locator and/or web site, in accordance with various embodiments of the invention; 
         FIG. 8  is a process flow diagram illustrating a method of responding to an attempted online fraud, in accordance with various embodiments of the invention. 
         FIGS. 9A and 10  illustrate systems that can be used to submit responses to a phishing scam, in accordance with various embodiments of the invention. 
         FIG. 9B  illustrates a method of submitting responses to a phishing scam, in accordance with various embodiments of the invention. 
         FIG. 11A  illustrates a system that can be used to identify an improper use of a customer&#39;s online identity, in accordance with various embodiments of the invention. 
         FIG. 11B  is a process flow diagram illustrating a method of identifying an improper use of a customer&#39;s online identity, in accordance with various embodiments of the invention. 
     
    
    
     DETAILED DESCRIPTION OF CERTAIN EMBODIMENTS 
     In accordance with various embodiments, systems, methods and software are provided for combating online fraud, and specifically “phishing” operations. An exemplary phishing operation, known as a “spoofing” scam, uses “spoofed” email messages to induce unsuspecting consumers into accessing an illicit web site and providing personal information to a server believed to be operated by a trusted affiliate (such as a bank, online retailer, etc.), when in fact the server is operated by another party masquerading as the trusted affiliate in order to gain access to the consumers&#39; personal information. As used herein, the term “personal information” should be understood to include any information that could be used to identify a person and/or normally would be revealed by that person only to a relatively trusted entity. Merely by way of example, personal information can include, without limitation, a financial institution account number, credit card number, expiration date and/or security code (sometimes referred to in the art as a “Card Verification Number,” “Card Verification Value,” “Card Verification Code” or “CVV”), and/or other financial information; a userid, password, mother&#39;s maiden name, and/or other security information; a full name, address, phone number, social security number, driver&#39;s license number, and/or other identifying information. 
     1. Overview 
     Certain embodiments of the invention feature systems, methods and/or software that attract such spoofed email messages, analyze the messages to assess the probability that the message is involved with a fraudulent activity (and/or comprises a spoofed message), and provide responses to any identified fraudulent activity.  FIG. 1A  illustrates the functional elements of an exemplary system  100  that can be used to combat online fraud in accordance with some of these embodiments and provides a general overview of how certain embodiments can operate. (Various embodiments will be discussed in additional detail below). It should be noted that the functional architecture depicted by  FIG. 1A  and the procedures described with respect to each functional component are provided for purposes of illustration only, and that embodiments of the invention are not necessarily limited to a particular functional or structural architecture; the various procedures discussed herein may be performed in any suitable framework. 
     In many cases, the system  100  of  FIG. 1A  may be operated by a fraud prevention service, security service, etc. (referred to herein as a “fraud prevention provider”) for one or more customers. Often, the customers will be entities with products, brands and/or web sites that risk being imitated, counterfeited and/or spoofed, such as online merchants, financial institutions, businesses, etc. In other cases, however, the fraud prevention provider may be an employee of the customer an/or an entity affiliated with and/or incorporated within the customer, such as the customer&#39;s security department, information services department, etc. 
     In accordance with some embodiments, of the invention, the system  100  can include (and/or have access to) a variety of data sources  105 . Although the data sources  105  are depicted, for ease of illustration, as part of system  100 , those skilled in the art will appreciate, based on the disclosure herein, that the data sources  105  often are maintained independently by third parties and/or may be accessed by the system  100 . In some cases, certain of the data sources  105  may be mirrored and/or copied locally (as appropriate), e.g., for easier access by the system  100 . 
     The data sources  105  can comprise any source from which data about a possible online fraud may be obtained, including, without limitation, one or more chat rooms  105   a , newsgroup feeds  105   b , domain registration files  105   c , and/or email feeds  105   d . The system  100  can use information obtained from any of the data sources  105  to detect an instance of online fraud and/or to enhance the efficiency and/or effectiveness of the fraud prevention methodology discussed herein. In some cases, the system  100  (and/or components thereof) can be configured to “crawl” (e.g., to automatically access and/or download information from) various of the data sources  105  to find pertinent information, perhaps on a scheduled basis (e.g., once every 10 minutes, once per day, once per week, etc.). 
     Merely by way of example, there are several newsgroups commonly used to discuss new spamming/spoofing schemes, as well as to trade lists of harvested email addresses. There are also anti-abuse newsgroups that track such schemes. The system  100  may be configured to crawl any applicable newsgroup(s)  105   b  to find information about new spoof scams, new lists of harvested addresses, new sources for harvested addresses, etc. In some cases, the system  100  may be configured to search for specified keywords (such as “phish,” “spoof,” etc.) in such crawling. In other cases, newsgroups may be scanned for URLs, which may be download (or copied) and subjected to further analysis, for instance, as described in detail below. In addition, as noted above, there may be one or more anti-abuse groups that can be monitored. Such anti-abuse newsgroups often list new scams that have been discovered and/or provide URLs for such scams. Thus, such anti-abuse groups may be monitored/crawled, e.g., in the way described above, to find relevant information, which may then be subjected to further analysis. Any other data source (including, for example, web pages and/or entire web sites, email messages, etc.) may be crawled and/or searched in a similar manner. 
     As another example, online chat rooms (including without limitation, Internet Relay Chat (“IRC”) channels, chat rooms maintained/hosted by various ISPs, such as Yahoo™, America Online™, etc., and/or the like) (e.g.,  105   a ) may be monitored (and/or logs from such chat rooms may be crawled) for pertinent information. In some cases, an automated process (known in the art as a “bot”) may be used for this purpose. In other cases, however, a human attendant may monitor such chat rooms personally. Those skilled in the art will appreciate that often such chat rooms require participation to maintain access privileges. In some cases, therefore, either a bot or a human attendant may post entries to such chat rooms in order to be seen as a contributor. 
     Domain registration zone files  105   c  (and/or any other sources of domain and/or network information, such as Internet registry e.g., ARIN) may also be used as data sources. As those skilled in the art will appreciate, zone files are updated periodically (e.g., hourly or daily) to reflect new domain registrations. These files may be crawled/scanned periodically to look for new domain registrations. In particular embodiments, a zone file  105   c  may be scanned for registrations similar to a customer&#39;s name and/or domain. Merely by way of example, the system  100  can be configured to search for similar domains registration with a different top level domain (“TLD”) or global top level domain (“gTLD”), and/or a domains with similar spellings. Thus, if a customer uses the &lt;acmeproducts.com&gt; domain, the registration of &lt;acmeproducts.biz&gt;, &lt;acmeproducts.co.uk&gt;, and/or &lt;acmeproduct.com&gt; might be of interest as potential hosts for spoof sites, and domain registrations for such domains could be downloaded and/or noted, for further analysis of the domains to which the registrations correspond. In some embodiments, if a suspicious domain is found, that domain may be placed on a monitoring list. Domains on the monitoring list may be monitored periodically, as described in further detail below, to determine whether the domain has become “live” (e.g., whether there is an accessible web page associated with the domain). 
     One or more email feeds  105   d  can provide additional data sources for the system  100 . An email feed can be any source of email messages, including spam messages, as described above. (Indeed, a single incoming email message may be considered an email feed in accordance with some embodiments.) In some cases, for instance as described in more detail below, bait email addresses may be “seeded” or planted by embodiments of the invention, and/or these planted addresses can provide a source of email (i.e., an email feed). The system  100 , therefore, can include an address planter  170 , which is shown in detail with respect to  FIG. 1B . 
     The address planter  170  can include an email address generator  175 . The address generator  175  can be in communication with a user interface  180  and/or one or more databases  185  (each of which may comprise a relational database and/or any other suitable storage mechanism). One such data store may comprises a database of userid information  185   a . The userid information  185   a  can include a list of names, numbers and/or other identifiers that can be used to generate userids in accordance with embodiments of the invention. In some cases, the userid information  185   a  may be categorized (e.g., into first names, last names, modifiers, such as numbers or other characters, etc.). Another data store may comprise domain information  180 . The database of domain information  180  may include a list of domains available for addresses. In many cases, these domains will be domains that are owned/managed by the operator of the address planter  170 . In other cases, however, the domains might be managed by others, such as commercial and/or consumer ISPs, etc. 
     The address generator  175  comprises an address generation engine, which can be configured to generate (on an individual and/or batch basis), email addresses that can be planted at appropriate locations on the Internet (or elsewhere). Merely by way of example, the address generator  175  may be configured to select one or more elements of userid information from the userid data store  185   a  (and/or to combine a plurality of such elements), and append to those elements a domain selected from the domain data store  185   b , thereby creating an email address. The procedure for combining these components is discretionary. Merely by way of example, in some embodiments, the address generator  175  can be configured to prioritize certain domain names, such that relatively more addresses will be generated for those domains. In other embodiments, the process might comprise a random selection of one or more address components. 
     Some embodiments of the address planter  170  include a tracking database  190 , which can be used to track planting operations, including without limitation the location (e.g., web site, etc.) at which a particular address is planted, the date/time of the planting, as well as any other pertinent detail about the planting. Merely by way of example, if an address is planted by subscribing to a mailing list with a given address, the mailing list (as well, perhaps, as the web site, list maintainer&#39;s email address, etc.) can be documented in the tracking database. In some cases, the tracking of this information can be automated (e.g., if the address planter&#39;s  170  user interface  180  includes a web browser and/or email client, and that web browser/email client is used to plant the address, information about the planting information may be automatically registered by the address planter  170 ). Alternatively, a user may plant an address manually (e.g., using her own web browser, email client, etc.), and therefore may add pertinent information to the tracking database via a dedicated input window, web browser, etc. 
     In one set of embodiments, therefore, the address planter  170  may be used to generate an email address, plant an email address (whether or not generated by the address planter  170 ) in a specified location and/or track information about the planting operation. In particular embodiments, the address planter  170  may also include one or more application programming interfaces (“API”)  195 , which can allow other components of the system  100  of  FIG. 1  (or any other appropriate system) to interact programmatically with the address planter. Merely by way of example, in some embodiments, an API  195  can allow the address planter  170  to interface with a web browser, email client, etc. to perform planting operations. (In other embodiments, as described above, such functionality may be included in the address planter  170  itself). 
     A particular use of the API  195  in certain embodiments is to allow other system components (including, in particular, the event manager  135 ) to obtain and/or update information about address planting operations (and/or their results). (In some cases, programmatic access to the address planter  170  may not be needed—the necessary components of the system  100  can merely have access—via SQL, etc.—one or more of the data stores  185 , as needed.) Merely by way of example, if an email message is analyzed by the system  100  (e.g., as described in detail below), the system  100  may interrogate the address planter  170  and/or one or more of the data stores  185  to determine whether the email message was addressed to an address planted by the address planter  170 . If so, the address planter  170  (or some other component of the system  100 , such as the event manager  135 ), may note the planting location as a location likely to provoke phish messages, so that additional addresses may be planted in such a location, as desired. In this way, the system  100  can implement a feedback loop to enhance the efficiency of planting operations. (Note that this feedback process can be implemented for any desired type of “unsolicited” message, including without limitation phish messages, generic spam messages, messages evidencing trademark misuse, etc.). 
     Other email feeds are described elsewhere herein, and they can include (but are not limited to), messages received directly from spammers/phishers; email forwarded from users, ISPs and/or any other source (based, perhaps, on a suspicion that the email is a spam and/or phish); email forwarded from mailing lists (including without limitation anti-abuse mailing lists), etc. When an email message (which might be a spam message) is received by the system  100 , that message can be analyzed to determine whether it is part of a phishing/spoofing scheme. The analysis of information received from any of these data feeds is described in further detail below, and it often includes an evaluation of whether a web site (often referenced by a URL or other information received/downloaded from a data source  105 ) is likely to be engaged in a phishing and/or spoofing scam. 
     Any email message incoming to the system can be analyzed according to various methods of the invention. As those skilled in the art will appreciate, there is a vast quantity of unsolicited email traffic on the Internet, and many of those messages may be of interest in the online fraud context. Merely by way of example, some email messages may be transmitted as part of a phishing scam, described in more detail herein. Other messages may solicit customers for black- and/or grey-market goods, such as pirated software, counterfeit designer items (including without limitation watches, handbags, etc.). Still other messages may be advertisements for legitimate goods, but may comprise unlawful or otherwise forbidden (e.g., by contract) practices, such as improper trademark use and/or infringement, deliberate under-pricing of goods, etc. Various embodiments of the invention can be configured to search for, identify and/or respond to one or more of these practices, as detailed below. (It should be noted as well that certain embodiments may be configured to access, monitor, crawl, etc. data sources—including zone files, web sites, chat rooms, etc.—other than email feeds for similar conduct). Merely by way of example, the system  100  could be configured to scan one or more data sources for the term ROLEX™, and/or identify any improper advertisements for ROLEX™ watches. 
     Those skilled in the art will further appreciate that an average email address will receive many unsolicited email messages, and the system  100  may be configured, as described below, to receive and/or analyze such messages. Incoming messages may be received in many ways. Merely by way of example, some messages might be received “randomly,” in that no action is taken to prompt the messages. Alternatively, one or more users may forward such messages to the system. Merely by way of example, an ISP might instruct its users to forward all unsolicited messages to a particular address, which could be monitored by the system  100 , as described below, or might automatically forward copies of users&#39; incoming messages to such an address. In particular embodiments, an ISP might forward suspicious messages transmitted to its users (and/or parts of such suspicious messages, including, for example, any URLs included in such messages) to the system  100  (and/or any appropriate component thereof) on a periodic basis. In some cases, the ISP might have a filtering system designed to facilitate this process, and/or certain features of the system  100  might be implemented (and/or duplicated) within the ISP&#39;s system. 
     As described above, the system  100  can also plant or “seed” bait email addresses (and/or other bait information) in certain of the data sources, e.g. for harvesting by spammers/phishers. In general, these bait email addresses are designed to offer an attractive target to a harvester of email addresses, and the bait email addresses usually (but not always) will be generated specifically for the purpose of attracting phishers and therefore will not be used for normal email correspondence. 
     Returning to  FIG. 1A , therefore, the system  100  can further include a “honey pot”  110 . The honey pot  110  can be used to receive information from each of the data sources  105  and/or to correlate that information for further analysis if needed. The honey pot  110  can receive such information in a variety of ways, according to various embodiments of the invention, and how the honey pot  110  receives the information is discretionary. 
     Merely by way of example, the honey pot  100  may, but need not, be used to do the actual crawling/monitoring of the data sources, as described above. (In some cases, one or more other computers/programs may be used to do the actual crawling/monitoring operations and/or may transmit to the honey pot  110  any relevant information obtained through such operations. For instance, a process might be configured to monitor zone files and transmit to the honey pot  110  for analysis any new, lapsed and/or otherwise modified domain registrations. Alternatively, a zone file can be fed as input to the honey pot  110 , and/or the honey pot  110  can be used to search for any modified domain registrations.) The honey pot  110  may also be configured to receive email messages (which might be forwarded from another recipient) and/or to monitor one or more bait email addresses for incoming email. In particular embodiments, the system  100  may be configured such that the honey pot  110  is the mail server for one or more email addresses (which may be bait addresses), so that all mail addressed to such addresses is sent directly to the honey pot  110 . The honey pot  110 , therefore, can comprise a device and/or software that functions to receive email messages (such as an SMTP server, etc.) and/or retrieve email messages (such as a POP3 and/or IMAP client, etc.) addressed to the bait email addresses. Such devices and software are well-known in the art and need not be discussed in detail herein. In accordance with various embodiments, the honey pot  110  can be configured to receive any (or all) of a variety of well-known message formats, including SMTP, MIME, HTML, RTF, SMS and/or the like. The honey pot  110  may also comprise one or more databases (and/or other data structures), which can be used to hold/categorize information obtained from email messages and other data (such as zone files, etc.), as well as from crawling/monitoring operations. 
     In some aspects, the honey pot  110  might be configured to do some preliminary categorization and/or filtration of received data (including without limitation received email messages). In particular embodiments, for example, the honey pot  110  can be configured to search received data for “blacklisted” words or phrases. (The concept of a “blacklist” is described in further detail below). The honey pot  110  can segregate data/messages containing such blacklisted terms for prioritized processing, etc. and/or filter data/messages based on these or other criteria. 
     The honey pot  110  also may be configured to operate in accordance with a customer policy  115 . An exemplary customer policy might instruct the honey pot to watch for certain types and/or formats of emails, including, for instance, to search for certain keywords, allowing for customization on a customer-by-customer basis. In addition, the honey pot  110  may utilize extended monitoring options  120 , including monitoring for other conditions, such as monitoring a customer&#39;s web site for compromises, etc. The honey pot  110 , upon receiving a message, optionally can convert the email message into a data file. 
     In some embodiments, the honey pot  110  will be in communication with one or more correlation engines  125 , which can perform a more detailed analysis of the email messages (and/or other information/data, such as information received from crawling/monitoring operations) received by the honey pot  110 . (It should be noted, however, that the assignment of functions herein to various components, such as honey pots  110 , correlation engines  125 , etc. is arbitrary, and in accordance with some embodiments, certain components may embody the functionality ascribed to other components.) 
     On a periodic basis and/or as incoming messages/information are received/retrieved by the honey pot  110 , the honey pot  110  will transmit the received/retrieved email messages (and/or corresponding data files) to an available correlation engine  125  for aralysis. Alternatively, each correlation engine  125  may be configured to periodically retrieve messages/data files from the honey pot  110  (e.g., using a scheduled FTP process, etc.). For example, in certain implementations, the honey pot  110  may store email messages and/or other data (which may or may not be categorized/filtered), as described above, and each correlation engine may retrieve data an/or messages on a periodic and/or ad hoc basis. For instance, when a correlation engine  125  has available processing capacity (e.g., it has finished processing any data/messages in its queue), it might download the next one hundred messages, data files, etc. from the honeypot  110  for processing. In accordance with certain embodiments, various correlation engines (e.g.,  125   a ,  125   b ,  125   c ,  125   d ) may be specifically configured to process certain types of data (e.g., domain registrations, email, etc.). In other embodiments, all correlation engines  125  may be configured to process any available data, and/or the plurality of correlation engines (e.g.,  125   a ,  125   b ,  125   c ,  125   d ) can be implemented to take advantage of the enhanced efficiency of parallel processing. 
     The correlation engine(s)  125  can analyze the data (including, merely by way of example, email messages) to determine whether any of the messages received by the honey pot  110  are phish messages and/or are likely to evidence a fraudulent attempt to collect personal information. Procedures for performing this analysis are described in detail below. 
     The correlation engine  125  can be in communication an event manager  135 , which may also be in communication with a monitoring center  130 . (Alternatively, the correlation engine  125  may also be in direct communication with the monitoring center  130 .) In particular embodiments, the event manager  135  may be a computer and/or software application, which can be accessible by a technician in the monitoring center  130 . If the correlation engine  125  determines that a particular incoming email message is a likely candidate for fraudulent activity or that information obtained through crawling/monitoring operations may indicate fraudulent activity, the correlation engine  125  can signal to the event manager  135  that an event should be created for the email message. In particular embodiments, the correlation engine  125  and/or event manager  135  can be configured to communicate using the Simple Network Management (“SNMP”) protocol well known in the art, and the correlation engine&#39;s signal can comprise an SNMP “trap” indicating that analyzed message(s) and/or data have indicated a possible fraudulent event that should be investigated further. In response to the signal (e.g., SNMP trap), the event manager  135  can create an event (which may comprise an SNMP event or may be of a proprietary format). 
     Upon the creation of an event, the event manager  135  can commence an intelligence gathering operation (investigation)  140  of the message/information and/or any URLs included in and/or associated with message/information. As described in detail below, the investigation can include gathering information about the domain and/or IP address associated with the URLs, as well as interrogating the server(s) hosting the resources (e.g., web page, etc.) referenced by the URLs. (As used herein, the term “server” is sometimes used, as the context indicates, any computer system that is capable of offering IP-based services or conducting online transactions in which personal information may be exchanged, and specifically a computer system that may be engaged in the fraudulent collection of personal information, such as by serving web pages that request personal information. The most common example of such a server, therefore, is a web server that operates using the hypertext transfer protocol (“HTTP”) and/or any of several related services, although in some cases, servers may provide other services, such as database services, etc.). In certain embodiments, if a single email message (or information file) includes multiple URLs, a separate event may be created for each URL; in other cases, a single event may cover all of the URLs in a particular message. If the message and/or investigation indicates that the event relates to a particular customer, the event may be associated with that customer. 
     The event manager can also prepare an automated report  145  (and/or cause another process, such as a reporting module (not shown) to generate a report), which may be analyzed by an additional technician at the monitoring center  130  (or any other location, for that matter), for the event; the report can include a summary of the investigation and/or any information obtained by the investigation. In some embodiments, the process may be completely automated, so that no human analysis is necessary. If desired (and perhaps as indicated by the customer policy  115 ), the event manager  135  can automatically create a customer notification  150  informing the affected customer of the event. The customer notification  150  can comprise some (or all) of the information from the report  145 . Alternatively, the customer notification  150  can merely notify the customer of an event (e.g., via email, telephone, pager, etc.) allowing a customer to access a copy of the report (e.g., via a web browser, client application, etc.). Customers may also view events of interest to the using a portal, such as a dedicated web site that shows events involving that customer (e.g., where the event involves a fraud using the customer&#39;s trademarks, products, business identity, etc.). 
     If the investigation  140  reveals that the server referenced by the URL is involved in a fraudulent attempt to collect personal information, the technician may initiate an interdiction response  155  (also referred to herein as a “technical response”). (Alternatively, the event manager  135  could be configured to initiate a response automatically without intervention by the technician). Depending on the circumstances and the embodiment, a variety of responses could be appropriate. For instance, those skilled in the art will recognize that in some cases, a server can be compromised (i.e., “hacked”), in which case the server is executing applications and/or providing services not under the control of the operator of the server. (As used in this context, the term “operator” means an entity that owns, maintains and/or otherwise is responsible for the server.) If the investigation  140  reveals that the server appears to be compromised, such that the operator of the server is merely an unwitting victim and not a participant in the fraudulent scheme, the appropriate response could simply comprise informing the operator of the server that the server has been compromised, and perhaps explaining how to repair any vulnerabilities that allowed the compromise. 
     In other cases, other responses may be more appropriate. Such responses can be classified generally as either administrative  160  or technical  165  in nature, as described more fully below. In some cases, the system  100  may include a dilution engine (not shown), which can be used to undertake technical responses, as described more fully below. In some embodiments, the dilution engine may be a software application running on a computer and configured, inter alia, to create and/or format responses to a phishing scam, in accordance with methods of the invention. The dilution engine may reside on the same computer as (and/or be incorporated in) a correlation engine  125 , event manager  135 , etc. and/or may reside on a separate computer, which may be in communication with any of these components. 
     As described above, in some embodiments, the system  100  may incorporate a feedback process, to facilitate a determination of which planting locations/techniques are relatively more effective at generating spam. Merely by way of example, the system  100  can include an address planter  170 , which may provide a mechanism for tracking information about planted addresses, as described above. Correspondingly, the event manager  135  may be configured to analyze an email message (and particular, a message resulting in an event) to determine if the message resulted from a planting operation. For instance, the addressees of the message may be evaluated to determine which, if any, correspond to one or more addressees) planted by the system  100 . If it is determined that the message does correspond to one or more planted addresses, a database of planted addresses may be consulted to determine the circumstances of the planting, and the system  100  might display this information for a technician. In this way, a technician could choose to plant additional addresses in fruitful locations. Alternatively, the system  100  could be configured to provide automatic feedback to the address planter  170 , which in turn could be configured to automatically plant additional addresses in such locations. 
     In accordance with various embodiments of the invention, therefore, a set of data about a possible online fraud (which may be an email message, domain registration, URL, and/or any other relevant data about an online fraud) may be received and analyzed to determine the existence of a fraudulent activity, an example of which may be a phishing scheme. As used herein, the term “phishing” means a fraudulent scheme to induce a user to take an action that the user would not otherwise take, such as provide his or her personal information, buy illegitimate products, etc., often by sending unsolicited email message (or some other communication, such as a telephone call, web page, SMS message, etc.) requesting that the user access an server, such as a web server, which may appear to be legitimate. If so, any relevant email message, URL, web site, etc. may be investigated, and/or responsive action may be taken. Additional features and other embodiments are discussed in further detail below. 
     2. Exemplary Embodiments 
     As noted above, certain embodiments of the invention provide systems for dealing with online fraud. The system  200  of  FIG. 2  can be considered exemplary of one set of embodiments. The system  200  generally runs in a networked environment, which can include a network  205 . In many cases, the network  205  will be the Internet, although in some embodiments, the network  205  may be some other public and/or private network. In general, any network capable of supporting data communications between computers will suffice. The system  200  includes a master computer  210 , which can be used to perform any of the procedures or methods discussed herein. In particular, the master computer  210  can be configured (e.g., via a software application) to crawl/monitor various data sources, seed bait email addresses, gather and/or analyze email messages transmitted to the bait email addresses, create and/or track events, investigate URLs and/or servers, prepare reports about events, notify customers about events, and/or communicate with a monitoring center  215  (and, more particularly, with a monitoring computer  220  within the monitoring center) e.g. via a telecommunication link. The master computer  210  may be a plurality of computers, and each of the plurality of computers may be configured to perform specific processes in accordance with various embodiments. Merely by way of example, one computer may be configured to perform the functions described above with respect to a honey pot, another computer may be configured to execute software associated with a correlation engine, e.g. performing the analysis of email messages/data files; a third computer may be configured to serve as an event manager, e.g., investigating and/or responding to incidents of suspected fraud, and/or a fourth computer may be configured to act as a dilution engine, e.g., to generate and/or transmit a technical response, which may comprise, merely by way of example, one or more HTTP requests, as described in further detail below. Likewise, the monitoring computer  220  may be configured to perform any appropriate functions. 
     The monitoring center  215 , the monitoring computer  220 , and/or the master computer  210  may be in communication with one or more customers  225  e.g., via a telecommunication link, which can comprise connection via any medium capable of providing voice and/or data communication, such as a telephone line, wireless connection, wide area network, local area network, virtual private network, and/or the like. Such communications may be data communications and/or voice communications (e.g., a technician at the monitoring center can conduct telephone communications with a person at the customer). Communications with the customer(s)  225  can include transmission of an event report, notification of an event, and/or consultation with respect to responses to fraudulent activities. 
     The master computer  210  can include (and/or be in communication with) a plurality of data sources, including without limitation the data sources  105  described above. Other data sources may be used as well. For example, the master computer can comprise an evidence database  230  and/or a database of “safe data,”  235 , which can be used to generate and/or store bait email addresses and/or personal information for one or more fictitious (or real) identities, for use as discussed in detail below. (As used herein, the term “database” should be interpreted broadly to include any means of storing data, including traditional database management software, operating system file systems, and/or the like.) The master computer  210  can also be in communication with one or more sources of information about the Internet and/or any servers to be investigated. Such sources of information can include a domain WHOIS database  240 , zone data file  245 , etc. Those skilled in the art will appreciate that WHOIS databases often are maintained by central registration authorities (e.g., the American Registry for Internet Numbers (“ARIN”), Network Solutions, Inc., etc), and the master computer  210  can be configured to query those authorities; alternatively, the master computer  210  could be configured to obtain such information from other sources, such as privately-maintained databases, etc. The master computer  210  (and/or any other appropriate system component) may use these resources, and others, such as publicly-available domain name server (DNS) data, routing data and/or the like, to investigate a server  250  suspected of conducting fraudulent activities. As noted above, the server  250  can be any computer capable of processing online transactions, serving web pages and/or otherwise collecting personal information. 
     The system can also include one or more response computers  255 , which can be used to provide a technical response to fraudulent activities, as described in more detail below. In particular embodiments, one or more the response computers  255  may comprise and/or be in communication with a dilution engine, which can be used to create and/or format a response to a phishing scam. (It should be noted that the functions of the response computers  255  can also be performed by the master computer  210 , monitoring computer  220 , etc.) In particular embodiments, a plurality of computers (e.g.,  255   a - c ) can be used to provide a distributed response. The response computers  255 , as well as the master computer  210  and/or the monitoring computer  220 , can be special-purpose computers with hardware, firmware and/or software instructions for performing the necessary tasks. Alternatively, these computers  210 ,  220 ,  255  may be general purpose computers having an operating system including, for example, personal computers and/or laptop computers running any appropriate flavor of Microsoft Corp.&#39;s Windows™ and/or Apple Corp.&#39;s Macintosh™ operating systems) and/or workstation computers running any of a variety of commercially-available UNIX™ or UNIX-like operating systems. In particular embodiments, the computers  210 ,  220 ,  255  can run any of a variety of free operating systems such as GNU/Linux, FreeBSD, etc. 
     The computers  210 ,  220 ,  255  can also run a variety of server applications, including HTTP servers, FTP servers, CGI servers, database servers, Java servers, and the like. These computers can be one or more general purpose computers capable of executing programs or scripts in response to requests from and/or interaction with other computers, including without limitation web applications. Such applications can be implemented as one or more scripts or programs written in any programming language, including merely by way of example, C, C++, Java™, COBOL, or any scripting language, such as Perl, Python, or TCL, or any combination thereof. The computers  210 ,  220 ,  255  can also include database server software, including without limitation packages commercially available from Oracle™, Microsoft™, Sybase™, IBM™ and the like, which can process requests from database clients running locally and/or on other computers. Merely by way of example, the master computer  210  can be an Intel™ processor-machine operating the GNU/Linux operating system and the PostgreSQL database engine, configured to run proprietary application software for performing tasks in accordance with embodiments of the invention. 
     In some embodiments, one or more computers  110  can create web pages dynamically as necessary for displaying investigation reports, etc. These web pages can serve as an interface between one computer (e.g., the master computer  210 ) and another (e.g., the monitoring computer  220 ). Alternatively, a computer (e.g., the master computer  210 ) may run a server application, while another (e.g., the monitoring computer  220 ) device can run a dedicated client application. The server application, therefore, can serve as an interface for the user device running the client application. Alternatively, certain of the computers may be configured as “thin clients” or terminals in communication with other computers. 
     The system  200  can include one or more data stores, which can comprise one or more hard drives, etc. and which can be used to store, for example, databases (e.g.,  230 ,  235 ) The location of the data stores is discretionary: Merely by way of example, they can reside on a storage medium local to (and/or resident in) one or more of the computers. Alternatively, they can be remote from any or all of these devices, so long as they are in communication (e.g., via the network  205 ) with one or more of these. In some embodiments, the data stores can reside in a storage-area network (“SAN”) familiar to those skilled in the art. (Likewise, any necessary files for performing the functions attributed to the computers  210 ,  220 ,  255  can be stored a computer-readable storage medium local to and/or remote from the respective computer, as appropriate.) 
       FIG. 3  provides a generalized schematic illustration of one embodiment of a computer system  300  that can perform the methods of the invention and/or the functions of a master computer, monitoring computer and/or response computer, as described herein.  FIG. 3  is meant only to provide a generalized illustration of various components, any of which may be utilized as appropriate. The computer system  300  can include hardware components that can be coupled electrically via a bus  305 , including one or more processors  310 ; one or more storage devices  315 , which can include without limitation a disk drive, an optical storage device, solid-state storage device such as a random access memory (“RAM”) and/or a read-only memory (“ROM”), which can be programmable, flash-updateable and/or the like (and which can function as a data store, as described above). Also in communication with the bus  305  can be one or more input devices  320 , which can include without limitation a mouse, a keyboard and/or the like; one or more output devices  325 , which can include without limitation a display device, a printer and/or the like; and a communications subsystem  330 ; which can include without limitation a modem, a network card (wireless or wired), an infra-red communication device, and/or the like). 
     The computer system  300  also can comprise software elements, shown as being currently located within a working memory  335 , including an operating system  340  and/or other code  345 , such as an application program as described above and/or designed to implement methods of the invention. Those skilled in the art will appreciate that substantial variations may be made in accordance with specific embodiments and/or requirements. For example, customized hardware might also be used, and/or particular elements might be implemented in hardware, software (including portable software, such as applets), or both. 
     Another set of embodiments provides methods of combating online fraud which can be, in some cases, implemented by a computer or embodied in a computer software program. These methods may be, but need not be, implemented as a computer software application and/or with a computer system, including the systems described above.  FIGS. 4-8  collectively illustrate several such methods, which may be implemented separately and/or in conjunction with one another (as well as other methods). Some or all of the procedures described as part of these methods may be (but need not be) performed by the various components of system similar to that described with respect to  FIG. 1A , perhaps with interaction from one or more human technicians. 
       FIGS. 4A ,  4 B and  4 C illustrate methods of collecting information about possible incidents of online fraud. For instance,  FIG. 4A  illustrates a method  400  for inducing, receiving and/or categorizing incoming email message in accordance with certain embodiments of the invention. In some cases, a honeypot and/or a correlation engine may be used to perform the method  400 . In particular embodiments, an address generator, such as the address generator  170  described with respect to  FIG. 1B  may be used to perform certain operations, such planting bait email addresses, implementing a feedback loop, etc. The exemplary method  400  can include establishing a customer profile (block  402 ) for one or more customers. The customer profile can identify a blacklist of particular keywords that may indicate an incoming email message is attempting to spoof the customer. For instance, for a customer in the financial services industry, key words could be “loan,” “account,” “credit card,” and/or the like. The customer profile can also identify servers, URLs, domains and/or IP addresses known to be involved with phishing activities involving that customer, as well as default configuration information, such as the customer&#39;s threshold for considering an email message as a phish (e.g., relatively lenient or relatively strict), and/or the customer&#39;s preferences for responding to fraudulent activity (e.g., a preference for administrative response, a preferred level of technical response, etc.). 
     At block  404 , one or more “safe accounts” may be created, e.g., in the customer&#39;s system. These safe accounts can be valid accounts (e.g., active credit card accounts) that do not correspond to any real account holder, and the safe accounts may be associated with fictitious personal information, including a valid (or apparently valid) identifier, such as an account number, social security number, credit card number, etc., that does not correspond to any real account holder but may be accepted as valid by the customer&#39;s system. The safe accounts thereafter can be monitored (block  406 ) for any transactions or access attempts. Because the safe accounts do not correspond to a real account holder, any transactions, access attempt, etc. (“account activity”) represent an illegitimate use. In addition, the safe account can be used to trace and/or track the use of the identifier, as described in more detail below, and/or to compile an evidentiary record of fraudulent activity. 
     The method  400  can also include generating and/or planting bait email addresses, which can be used to attract spam and/or phish messages. In some cases, the bait addresses may be selected to be attractive to phishers (e.g., from attractive domains and/or using English proper names as the userids) and/or to be prioritized on harvested lists (e.g., having userids that begin with numbers, the letter a, or non-alphabetic characters, etc.). In this way, if a phisher sends a phish message to each of the addresses on a harvested list, there may be a higher probability that the bait addresses will receive the phish message relatively early in the mailing process, allowing the system to take responsive action before many actual recipients have had a chance to provide personal information in response to the phish. 
     Thus, in some embodiments, generating an email address can comprise selecting one or more userid elements (block  408 ) such as those described above, which can be used to generate an email address. The selection of userid elements can be performed by an address planter (as described above), by any other appropriate tool, and/or manually. If desired, two or more userid elements may be concatenated or otherwise combined to form a userid (block  410 ). In particular embodiments, the userid may simply comprise a single userid element. 
     The method  400  can further comprise selecting a hostname and/or domain name for the bait address (block  412 ). As described herein, the selection of a domain may consider several factors. Merely by way of example, certain domains may be prioritized as relatively more likely to provoke spam and/or phish messages (e.g., because of the nature of the domain name, because email addresses using that domain have provoked relatively more phish messages in the past, etc.). In many cases, the domain may be a domain that is owned and/or managed by the entity responsible for planting the addresses (or a domain to which such an entity has access). In particular cases, popular consumer ISP domains (such as “aol.com,” “msn.com,” etc. may be used. The owners of such domains may be in cooperation with the entity responsible for planting addresses. Alternatively, the address planter (or another tool) may be used to create an account at the appropriate ISP and/or to configure the account to auto-forward received messages to a honeypot, etc. 
     The domain name then may be appended to the userid to create an email address (block  414 ). (At this point, any necessary steps to enable the email address, such as creating a userid on the appropriate host, opening an account with an ISP, etc. may be taken, either automatically or by a technician. It can be appreciated, however, that in many cases no steps need be taken for a particular userid, since the mail exchange for the selected domain may be configured to accept incoming mail to any userid, as described herein). 
     One or more planting locations for the generated email address may be selected (block  416 ). Planting locations can include web sites, newsgroups and/or other locations described herein that may be likely to result in the planted address being harvested and/or receiving spam and/or phish emails. In some cases, it may be desirable to plant each email address in only one location (e.g., to facilitate the tracking and feedback processes, described below and with respect to  FIG. 1B ). In other cases, e.g., when it is desirable to maximize the impact of each generated address, a particular address may be planted in multiple locations. In particular embodiments, the selection of planting locations may be designed to facilitate triangulation procedures in assessing which planting location produced a phish/spam message, as described below in detail. 
     At block  418 , then, bait email addresses can be planted in appropriate locations, as described above. (Bait email addresses may be generated addresses, addresses associated with purchased domains, pre-existing addresses, etc.) In some cases, the planting locations may be the locations selected at block  416 . The task of planting (also referred to herein as “seeding”) the bait addresses can be automated (e.g. performed by a computer system such as a honey pot, address generator etc.) and/or performed manually. Merely by way of example, an address generator similar to the address generator  170  described with respect to  FIG. 1B  can be used to plant bait email addresses, using, in certain embodiments, a process similar to that described in detail with respect to  FIG. 1B . As noted above, in particular embodiments, it may be desirable to plant each created address in only one location (e.g., to assist in tracking and/or implementing a feedback loop). In other cases, to maximize the effect of each generated address, it may be desirable to plant each address in multiple locations. 
     In other embodiments, a variety of automated and/or manual processes could be used to plant (seed) bait addresses (which themselves may have been generated by an address generator, manually and/or through other automated processes); merely by way of example, an automated process could post newsgroup items that include bait email addresses, create a domain registration with a bait email address as the administrative contact, compile and/or distribute lists of bait addresses formatted to appear as a list of harvested addresses, etc. In some situations, planting an email address can comprise providing additional information. Merely by way of example, if planting an address comprises creating a WHOIS record with the address as an administrative contact, the planting operation can comprise providing other relevant information for inclusion in the WHOIS record, such as a telephone number, contact name, address, etc. In other examples, for instance when subscribing to a newsletter, a first and/or last name may be provided with the bait address. This information may be supplied manually and/or may be generated in automated fashion (e.g., by an address planter), perhaps in a manner similar to the generation of userids. In some cases, as described below, such additional information may be used to refine the process of determining which planting location resulted in a spam/phish email. Consequently, it may be useful to provide different information in each planting location (even if the bait address is the same). 
     The planting locations may be tracked (block  420 ), e.g. through the use of a tracking database, as described above. Additionally, any information provided along with the planted address may also be tracked. The tracking of planting locations can facilitate a feedback process, as described below. 
     After the bait email addresses have been planted, any incoming email messages to the bait addresses can be gathered (block  422 ), using any acceptable procedure, including the procedures discussed above. In accordance with some embodiments, for example, gathering an incoming email message can comprise downloading the incoming email message from a honey pot/mail server and/or converting the email message into a data file, which can have separate portions and/or fields corresponding to the header information of the email message, the body portion of the email message, any URLs included in the email message, and/or any attachments to the email message. Gathering the email message can further comprise transmitting the email message to a correlation engine for analysis, and/or the correlation downloading the email message. Any gathered incoming email messages (and/or corresponding data files) can be analyzed to determine whether the message should be categorized as a likely phish (i.e., a fraudulent email message) (block  424 ). One exemplary process for analyzing email messages is described below by reference to  FIG. 5 . 
     In accordance with particular embodiments, the planting process may implement a feedback loop (block  426 ), including, for instance, as described above. Merely by way of example, when an incoming email message is analyzed, the addressee of the incoming email message may be examined to determine if it correlates to any generated and/or planted address. If so, a lookup may be performed to determine where the address was planted (e.g., by searching a tracking database), and feedback may be provided to an address generator (and/or any other tool or entity responsible for planting addresses) to indicate that the planting location for that address is a likely source for spam and/or phish email messages. If desired, then, such location may be prioritized as a location for additional planting operations. 
     In some embodiments (e.g., where a generated address is planted in multiple locations), the feedback process may be more sophisticated. For example, if a particular address was planted in multiple locations, merely ascertaining the addressee of the incoming phish/spam message may be insufficient to determine which of the planting locations resulted in the message. In such cases, any of several procedures may be used to provide more information about which planting location generated the message. Merely by way of example, a triangulation procedure may be used. Consider the situation in which address A was planted in locations X and Y, while address B was planted in locations Y and Z, and address C was planted in locations X and Z. If phish messages are received by addresses A and C, it is likely that location X was the plant location that produced the phish messages. Similarly, if phish messages are received by addresses A and B, it is likely that location Y was the plant location that produced the phish messages, and so on. (It should be noted that the selection of plant locations for particular generated addresses may be configured to enhance the ability to perform such triangulation). 
     Another exemplary procedure can include parsing the incoming message for information identifying which of the planting locations produced the phish message. In a simple case, the domain from which the message originated may correlate with a domain at which the address was planted. (In some cases, domain analysis, as described elsewhere herein, may be used to refine this analysis. Merely by way of example, the WHOIS records for the planting locations may be analyzed to find any information that matches corresponding WHOIS information for the domain from which the phish message originated.) In other cases, the phish message may correlated to information provided with a planted address (such as a given name, last name, etc.), and such information may be used to determine which planting location resulted in the message. Based on the disclosure herein, one skilled in the art can appreciate that a variety of procedures may be used to ascertain which of several planting locations resulted in a phish message. 
       FIG. 4B  illustrates another method  435  that may be used to obtain information about potential fraudulent activities, including phishing/spoofing scams. The method  435  of  FIG. 4B , which may, in some cases be implemented using a honeypot, correlation engine and/or event manager (as described above, for example), can be used to acquire information from any appropriate data source, including without limitation the data sources  105  described above. In accordance with some embodiments, the method  435  can include accessing a data source (block  440 ). Accessing a data source can comprise any of a variety of procedures, depending on the type of data source, the type of information desired, and/or other pertinent factors. Merely by way of example, in some embodiments, accessing a data source can comprise using a process (which may be unattended and/or automated) to crawl the data source. Thus, for example, if the data source is a web site, one or more files on the web site may be crawled (i.e., accessed and/or downloaded), and such files optionally may be saved locally to the fraud-prevention system. In other cases, a web search engine (such as Google™, Lycos™, etc. may be used to search for information. If the data source is a limited-access data source, accessing the data source might comprise one or more authentication procedures (e.g., providing a usemame and/or password), which may be performed manually, interactively and/or in automated fashion. As another example, for instance, if the data source is an online chat room, accessing the data source can include logging onto the chat room. In further cases, accessing a data source can include downloading the entire data source, e.g., on a periodic or as-needed basis, and/or accessing (reading, parsing, searching, etc.) the downloaded data source. Merely by way of example, a domain registration zone file may be downloaded locally on a periodic basis, so that searches against the zone file can performed more quickly and/or in an offline fashion. 
     In particular embodiments, accessing a data source can include monitoring that data source. Monitoring a data source can include, in some cases, accessing the data source on a periodic basis. In accordance with some embodiments, monitoring a data source can comprise evaluating the data source for changes (e.g., additional and/or updated information) occurring since a previous access of the data source. Merely by way of example, a domain registration zone file may be monitored to find modifications to domain registrations (as described in more detail below). In other embodiments, monitoring a data source can comprise tracking changes to the data source occurring while the data source is being accessed. As one example, if the data source is an online chat room, monitoring the data source can comprise viewing, downloading, copying, etc. an online “conversation” taking place in the chat room. Somewhat analogously, if the data source is a newsgroup, the newsgroup may be monitored for new posts, replies, etc. 
     The method  435  can also include acquiring information from an accessed/monitored data source (block  445 ). Like accessing/monitoring a data source, acquiring information can take a variety of forms. For instance, if the data source is a file or set of files (such as a web site, domain registration file, newsgroup), acquiring information can comprise searching the file(s), e.g., for keywords, etc. Merely by way of example, information may be acquired by searching for URLs and/or relevant terms, such as “phish,” “spoof,” “scam,” etc., as well as variants of such words. Names of particular customers might also be search terms, as the presence of one of those names could indicate a possible fraudulent activity involving the customer. Files including such words may be downloaded and/or categorized for further analysis. In other cases, acquiring information can comprise copying and/or logging transcripts of online chat sessions that include relevant information, including information comprising URLS and/or relevant terms. 
     In particular embodiments, including for instance, if a data source is being monitored, acquiring information can comprise downloading and/or otherwise making a record of any modifications to the data source. This can be done generically (i.e., with respect to all modifications of the data source and/or the information contained therein) and/or selectively (i.e., only with respect to relevant information). Merely by way of example, if a domain registration zone file is being monitored, all changes to registration records might be noted and/or downloaded. Alternatively, only changes that meet certain criteria (e.g., new domains that are suspiciously similar to a client&#39;s domain name and/or trademark, or new domains that appear to cater to spammers, phishers and/or spoofers) might be noted and/or downloaded. In particular cases, if a useful domain name expires (e.g., is marked “expired” and/or disappears from a domain name registration zone file), that information may be noted, as described in further detail with respect to  FIG. 4C . 
     In general, acquiring information can comprise any action by which information may be obtained from a data source. Moreover, based on the disclosure herein, those skilled in the art will appreciate that the procedures of acquiring accessing a data source and acquiring information may be consolidated into a single procedure. In some cases, the process of acquiring information may also include notifying an administrator (and/or an automated process) that new information has been acquired and needs to be evaluated. This notification can include, without limitation, an email message, an inter-process software message, an application call, etc. In particular cases, acquired information may be placed in a particular location (e.g., a database or other data structure, a particular directory in a file system, etc.), and/or a process may monitor that location for new information to be evaluated. Hence, the notification might simply comprise placing the information in the correct location. 
     Once information has been acquired, that information may be evaluated (block  450 ). Evaluation of the information may be performed by an automated process and/or by a human technician. In some cases, evaluation may be performed during the process of acquiring the information. In a general sense, evaluating the information comprises making a determination of whether the information is likely to require further action, and/or determining what type of action may be required. Hence, the procedures for evaluating the information are likely to vary, depending at least in part on the type of information acquired, customer preferences (as noted in a customer policy, for example) 
     Merely by way of example, if the information relates to a suspected phishing scam, evaluation of the information may comprise parsing the information for a URL. If a URL is found, that may indicate that further investigation of the URL should be performed. Likewise, if information indicates a possible spam source and/or harvesting operation, it may be appropriate to further investigate the possibility of planting bait email addresses for harvesting. In other embodiments, the acquired information may indicate domain activity, such as a new registration, expired registration, etc., and evaluation of the information may include evaluating whether the domain activity warrants further action. 
     Merely by way of example, in particular cases, if the acquired information indicates that a suspicious domain has been registered, it may be appropriate to monitor the domain (block  455 ). (Monitoring the domain can be considered, in some cases, to be part of the evaluation process.) In accordance with certain embodiments, monitoring the domain can comprise checking the domain for activity, perhaps periodically (e.g., every fifteen minutes, every hour, every day, etc.). Checking the domain for activity can comprise attempting to access a website at the domain (e.g., by sending an HTTP GET request either to the domain itself and/or to common hostnames—www, web, etc.—at the domain), interrogating the domain for servers, monitoring domain registration records and/or DNS records, etc. If a domain becomes “live” (i.e., a server begins operating in that domain), that might indicate a need for further investigation of a possible fraudulent activity. 
     If evaluation of the information (and/or monitoring of a domain) does indicate that further investigation is necessary, such an investigation may be conducted. In accordance with some embodiments, an investigation may be initiated by creating an event (block  460 ), e.g., in an event manager, and/or otherwise making a record of the need for further investigation.  FIG. 6  (described below) illustrates some exemplary methods of investigating possible fraudulent activity, and block  605  (also described below) illustrates one possible procedure for creating an event. In some embodiments, events may be prioritized for investigation and/or response. Some events may be judged to be relatively less critical than other events, and the determination of which events are considered relatively more critical is discretionary. Merely by way of example, some types of online fraud (e.g., the selling of fake watches) may be judged to be less harmful than other types (e.g., attempts to collect personal information). In some cases, global parameters may define, for all customers, the relative urgency of different types of events. In other cases, a particular customer&#39;s profile can be configured to indicate, for that customer, which events should be treated as relatively more urgent. There may be several levels of urgency, and/or the levels can be identified using colors (e.g., yellow, orange, red), numbers (e.g., 1-5), and/or any other appropriate scheme to help the system, technicians and/or any other interested parties in identifying the relative urgency of a particular event. 
     As an example of how the method  400  can be used to monitor a domain in accordance with particular embodiments of the invention, consider the following scenario. If a company “Acme Products” wishes to avoid phishing schemes associated with its brand name, the company (and/or a third party security service provider, for example), may choose to monitor a zone file as a data source. Through the monitoring of the data source, it is discovered that the domain &lt;acmeproduct.com&gt; has been registered. In accordance with methods of the invention, a monitoring system can monitor that domain, for instance by periodically making HTTP GET requests to the domain (and/or to a host on that domain, such as www.acmeproduct.com). Once the domain has become available (i.e., the HTTP GET request returns something other than a failure), the system can be configured to crawl the web site, taking a “snapshot” of one or more (perhaps all) available pages on the web site. The snapshot can comprise a copy of the page(s) themselves and/or merely one or more checksums and/or hash values computed from, e.g., the contents of the page(s). This procedure can be continued periodically (such as, for example, once per minute, hour, day, etc.), and/or such periodic snapshots can be compared one against the other (for example, by quickly comparing hash values for returned pages, etc.). One skilled in the art will appreciate that, in its initial stages, a domain usually will have a “park” page indicating that the web site is “under construction,” etc. Hence, when the web site goes “live” (i.e., has some content other than a park page), the comparison of periodic snapshots will reveal this change. At the point the web site goes live, an investigation and/or analysis of the web site may be performed. In particular embodiments, for example, an event may be opened in an event manager and/or the investigation/analysis procedures described elsewhere herein may be performed. Thus, by monitoring the domain, a possible phishing operation may be uncovered before and phish messages have been sent (and, consequently, before any customers have been scammed by the phishing operation). 
     Other embodiments of the invention provide methods that can be used to encourage additional incoming spam messages.  FIG. 4C  illustrates one such method  465 . Messages prompted by such methods may, in some embodiments, be processed in similar fashion to that described with respect to  FIG. 4A  and/or analyzed as described in further detail below. In general, the method  465  involves the acquisition of expired domains and the collection of email messages addressed to those domains. As those skilled in the art will appreciate, once a domain expires, email addressed to recipients at that domain generally will no longer be routed to the recipients. Such recipients, therefore, generally will acquire new email addresses and notify their correspondents of those new addresses, who thereafter will use the new address, not the address at the expired domain. Thus, in many cases, any email messages still being sent to the expired domain will have a higher-than-average probability of being spam messages. 
     The method  465  can comprise accessing domain information (block  470 ). In many cases, accessing domain information can comprise accessing a relevant data source (e.g., a domain registration zone file) and/or acquiring information from that data source. The procedures described above may be used to access domain information in this fashion. In other cases, a variety of resources may be used to access domain information, including, merely by way of example, subscription to newsletters identifying expired domains (and/or domains about to expire), domain-squatting websites (which often advertise expired domains for sale), and/or the like. 
     The method  465  can further comprise evaluating the suitability of the domain for attracting spam messages (block  475 ). Merely by way of example, spammers sometimes send messages by demographics, and any attempt to attract such spam can attempt to simulate such demographics. For instance, a particular domain (e.g., &lt;musclecars.com&gt;) might indicate that users receiving email at that domain are likely to be car enthusiasts, and/or another domain (e.g., &lt;finearts.com&gt;) might indicate that users receiving email at that domain are likely to be enthusiasts of the arts. Other domains might indicate other likely demographics, such as female users, male users, young users, etc. 
     Other factors might be considered in evaluating the suitability of a domain. Merely by way of example, a domain that has been registered for a relatively long period of time would be relatively more likely to receive a greater quantity of spam than a domain with a relatively short history. Thus, evaluating the suitability of a domain might include an analysis of the length of time the domain has been registered and/or in existence. Such an analysis could include an examination of the relevant domain registration record, a review of various archive sites (including, merely by way of example, &lt;archive.org&gt;) that store archived web sites, etc. Further, if the domain registration already has expired, the length of time since the domain was last in use may be considered as a factor: a recently-expired domain is relatively more likely to receive spam than a long-expired domain. 
     If the domain registration has not already expired, the method  465  may comprise monitoring domain registration records (and/or other data sources for expiration (block  480 ). Merely by way of example, those skilled in the art will understand that a typical domain registration record (e.g., a record in a zone file), often will provide an indication of an expiration date for the domain. If a suitable domain is found, the expiration date may be noted, and/or data sources (e.g., zone files) may be monitored around the scheduled expiration date to determine whether the domain registration is renewed or expired. Similarly, zone file updates may be monitored for expired domains (as discussed above), and such domains may be evaluated for suitability. Thus, in accordance with various embodiments, the procedures for evaluating the suitability of the domain and monitoring the expiration of a domain may occur in any suitable order. In certain embodiments, monitoring the expiration of a domain may include monitoring any activity at the domain, for instance using the techniques described above. 
     If a suitable expired (or otherwise available) domain is found, that domain may be acquired (block  485 ). In some cases, acquiring a domain can comprise registering the domain with an appropriate registrar, a procedure familiar to those skilled in the art. This procedure may be automated and/or performed manually by a technician. In other cases, acquiring a domain can comprise purchasing the domain from a third party. In such cases, re-registration of the domain may be required. Optionally, bait email addresses related to the domain may be seeded and/or planted (block  490 ), e.g., for harvesting. One exemplary procedure for seeding/planting bait addresses is discussed above with respect to  FIG. 4A . Other procedures may be used as well. 
     A mail server (which might be a honeypot) can be configured to receive mail addressed to recipients at the domain, and/or email messages sent to the domain can be accepted by the mail server (block  495 ). Accepted messages may then be processed as described with respect to other methods discussed herein and/or as desired. In accordance with particular embodiments, the system may be configured so that all incoming messages to the domain are accepted, whether or not they are addressed to a valid recipient. In fact, messages addressed to invalid recipient addresses may be more likely to be spam and/or phishing attempts. It can be anticipated, for example, that some quantity of messages will be addressed to former users of the domain, and as described above, it is relatively more likely that such messages will be mass-mailings. 
     Further embodiments of the invention can be used to analyze, investigate and/or respond to any received information and/or messages (including without limitation information/messages received as a result of the methods described above).  FIG. 5 , for example, illustrates in detail a method  500  of analyzing an incoming email message (or data file) in accordance with certain embodiments of the invention. (In the discussion of  FIG. 5 , the terms data file and message are used interchangeably, since the methods of analysis can apply equally to a message and a data file, which may, as discussed above, correspond to a received email message but which also may correspond to any other data set, which may be acquired from a variety of different data sources, such as a news group posting, web page, and/or the like. Similarly, the other methods discussed herein may be applied to data files corresponding to such data sets and/or sources.) It should be noted that some of the procedures illustrated on  FIG. 5  may, in particular embodiments, take place at other points in the method  500  illustrated by  FIG. 5  (including, for example, gathering incoming email messages (block  525 )), and that the organization of the procedures in these methods (and indeed, all of the methods described herein) is merely for ease of description: Certain procedures may occur in an order different than that described herein; indeed, various procedures may be added and/or omitted in accordance with various embodiments of the invention. 
     The method  500  illustrated by  FIG. 5  can include time stamping the message (and/or any other data to be analyzed) and/or assigning an identifier to the message/data (which may be sufficient to uniquely identify the message (block  505 ), which can aid in the identification (e.g., throughout the processes discussed herein) of the message, provide a permanent indication of when the message was received, and/or facilitate the comparison of different messages. The procedure for developing an identifier is discretionary. Merely by way of example, the identifier may include information about when the analysis of the message/data (e.g., a time stamp), an indicator of the source of the message, etc. Alternatively, the identifier (and/or a component thereof) may be assigned serially and/or randomly, and/or the identifier may identify the type of data to be analyzed (e.g., domain registration, email message, etc.). 
     The method  500  can also include, in some embodiments, creating a data file from the message (block  510 ), perhaps in the manner described above. (As noted above, unless the context clearly indicates otherwise, email messages, other data—such as, for example, domain registrations, received URLs, etc.—and data files created from such messages/data can be processed in similar fashion, and the description of the procedures herein generally can be applied equally, with appropriate modifications as necessary, to any of these items.) The data files may then be collected (block  515 ), for instance, by transmitting the data files to a correlation engine and/or by a correlation engine downloading the data files from the computer (e.g. honey pot) that gathered the data files. (In some cases, it may not be necessary to collect the data files; for instance, the correlation engine and the honey pot may be incorporated within a single software program or program module and/or be running on the same computer.) 
     A data file may then be parsed or read by the correlation engine (block  520 ). The parsing can divide the data file into various sections and/or fields, which can allow the fields and/or sections of the data file to be analyzed by the correlation engine. For example, with respect to an email message, the header information can be analyzed (block  525 ) to determine, for instance, whether the source and/or destination information in the header has been forged. If so, it is relatively more likely that the email is a phish. As another example, the routing information in the message header may be analyzed to determine whether the message originated from and/or was routed through a suspect domain, again enhancing the likelihood that the message is a phish. 
     Any text, including without limitation the body of an email message (i.e., the body field of a data file) can then be analyzed (block  530 ). The analysis of the body can include searching the body for blacklisted and/or whitelisted terms; merely by way of example, a blacklisted term might include terms commonly found in phish messages, such as “free trip”; terms indicating that the message refers to personal information, such as “credit card,” “approval,” “confirm,” etc.; and/or brand names, the name of a customer, etc. Conversely, whitelisted terms are those that commonly indicate that the message is not a phish. It should be noted at this point that the system can be configured to provide a feedback loop, such that if a message is determined eventually to be a phish, the list of blacklisted terms can be automatically updated to include the text of that message (or portions of that text). Further, the correlation engine (and/or any other appropriate component) can include heuristic algorithms designed to defeat common phish tactics, such as obvious misspellings, garbage text, and the like. Likewise, the system may implement “stemming” logic, in order to identify common grammatical variations of root words (e.g., the words “going,” “goes,” “gone,” etc. can be identified as variants of “go,” and vice-versa). 
     Analyzing the body of the message can include other forms of analysis as well. Merely by way of example, if the body includes a URL or other form of redirection, the presence of those devices can also indicate a higher likelihood that the message is a phish (or conversely, that the message is not a phish). (In addition, the URLs and other redirection devices can be analyzed separately, as discussed below). Moreover, other factors, such as the length of the body of the email message, whether the body includes graphics, etc., can be considered in the analysis of body of the email message. 
     In addition, if the message does include a URL (or any other form of reference and/or redirection), the URL can be analyzed. (This analysis can also be applied to a URL received from another source, such as a list of URLs transmitted by an ISP, the URL of a suspicious web page, a URL associated with a suspicious domain registration, etc.) For example, network data (including without limitation DNS and/or WHOIS data, as well as network records, e.g., ARIN information), for the domain associated with the URL can be accessed. If this data indicates that the URL does not resolve to a domain (e.g., the URL resolves only to an IP address), the URL may be part of a phishing scam. Similarly, those skilled in the art can appreciate that phishing scams often are based from servers/domains outside the United States; as well, a particular domain may be known to be likely to host phishing scams. Hence, if the URL resolves to a suspicious domain or global top-level domain (“gTLD”), the URL may be part of a phishing scam. As another example, a URL (and/or the network data for the domain and/or IP address associated with the URL) may be compared with information in the email headers (including, for example, source address, “FROM:” field, etc.) and/or network data associated with such header information. If this comparison reveals inconsistencies, it may be relatively more likely that the message is a phish. Conversely, if this information is consistent, it may be (but is not necessarily) relatively more likely that the message is not a phish. 
     In accordance with some embodiments, analyzing a URL (obtained from any source) can involve one or more detailed tests.  FIG. 5B  illustrates an exemplary method  560  comprising a variety of such tests (any of which may be performed in various orders and/or combinations, depending on the embodiment). One test, for example, comprises testing the URL to determine that it is “live” (i.e., that a web page, etc. referenced by the URL is available) (block  562 ). This may be performed using a web browser, an HTTP GET request, etc. Further, the DNS information for a server and/or a domain referenced by the URL may be obtained (using any of several common methods) and/or analyzed (block  564 ) (e.g., to determine the IP address and/or network block of the server to which the URL refers). Similarly, the WHOIS information for the domain may be obtained and/or analyzed (block  566 ), e.g., to determine who owns the domain. In particular, any particular identifying information for the domain (e.g., a contact name, address, email address, phone number, etc.) may be noted. Any of the information obtained by these procedures may be stored for future reference and/or compared to similar information obtained through earlier analyses. In this way, for example, repeat offenders may be identified efficiently. Merely by way of example, if a domain associated with a URL being analyzed has the same contact email address as a domain previously found to be associated with an online scam, the current URL may be relatively more likely to be associated with a scam. 
     In accordance with some embodiments, the geographical location of the server hosting the URL may be determined (block  568 ). Those skilled in the art will appreciated that there are a variety of known procedures for determining the geographical location of a server (based on its domain name and/or IP address, for example) and any of these procedures may be used. The geographical location of a server can provide an indication of whether the server is likely engaged in a fraudulent activity. Merely by way of example, if a server located in Eastern Europe is hosting a web site that purports to be associated with a company located in the U.S., it may be relatively more likely that the web site is fraudulent. In addition, determining the location of the server may provide an indication of what administrative and/or technical responses are available with respect to web pages served by that server. 
     The composition of the URL itself may also reveal whether the URL is likely to refer to a fraudulent web site. Merely by way of example, in many cases, a URL referring to a legitimate corporate web site will have a fairly simple directory path, such as the root (default) path for the web server (e.g., “/”, or perhaps a subdirectory of the root path (e.g., “/verify/”). Any URLs with convoluted or unusual directory paths, therefore, may be more likely to be engaged in fraudulent activity, and an examination of the URL itself might provide some indication of this fact. Thus, the method  560  can include, in some cases, evaluating the directory path of the URL (block  570 ). Merely by way of example, if the URL references a user directory (e.g., “/˜jsmth/”) the URL may be relatively more likely to refer to an illegitimate web site, since a legitimate corporate web site would not be expected to reside in a user&#39;s directory. Because scammers recognize this fact, they sometimes attempt to obscure the directory path of the web site using, for example, URL redirection, which often results in relatively unconventional URLs. Thus, the encoding of the URL also may be examined (block  572 ). If the URL has unconventional coding (such as character strings in the place of a directory path, etc.), such unconventional coding may indicate that the URL includes implicit redirection (e.g., to an obscured path), meaning the URL may be relatively more likely to refer to an illegitimate web site. 
     In some cases, sources of anti-abuse information, such as anti-abuse newsgroups, email lists, etc. may be searched for references to the URL being analyzed (and/or for a host, domain, IP address and/or network block associated with the URL (block  574 ). A reference in one of these anti-abuse sources may indicated that the URL refers to a fraudulent web site. 
     Another factor that may be considered is whether the URL refers to an encrypted connection, such as a connection secured by the Secured Sockets Layer (“SSL”) encryption scheme known to those skilled in the art (block  576 ). For example, if the protocol specified by the URL is “https,” the URL generally will link to a secured connection. Alternatively, the server hosting the resource referenced by the URL may be interrogated to determine whether the server accepts secured connections, for example by submitting an HTTPS GET request to the hostname (or IP address) referenced by the URL. Other procedures may be used as well. The use of encryption or other security may indicate that the referenced web site is relatively more (or less) likely to be engaged in fraudulent activity. 
     In addition to testing for secured connections, the server and/or web site to which the URL refers may be subjected to additional tests. (Such tests may also be performed as part of a web site/server investigation, such as the investigation described with respect to  FIG. 7 ). Merely by way of example, the active ports on the server may be verified (block  578 ), e.g., using a port scanner and/or other diagnostic tools (including without limitation those discussed above, such as NMAP and Nessus). If a server is listening on “high” or “unknown” ports (e.g., any port numbered above  1024 ), the activity of such ports may indicate that the web site is relatively more likely to be illegitimate. (In addition, the URL may be further evaluated to determine whether it refers to a high or unknown port number, which would provide a similar indication). Further, if the server “listens” on ports known to allow security vulnerabilities, it may be relatively more likely that the server has been compromised, which could indicate an enhanced likelihood of a fraudulent activity. 
     In some cases, it may be appropriate to “crawl” the web site referenced by the URL (and/or a portion of that web site, such as the referenced page, the first tell pages, the first level of links, etc.) (block  580 ). This procedure is described in more detail with respect to  FIG. 7 . The downloaded pages may provide additional indications of whether the web site is legitimate. Merely by way of example, the pages can be checked for spelling and/or grammar errors (block  582 ). The presence of such errors (particularly if they are relatively numerous) can indicate that the web site is not professionally designed and/or maintained, and therefore is relatively more likely to be fraudulent. Similarly, the method may test for the presence of any HTML forms (and/or the contents of the forms) (block  584 ), which may provide an indication of the legitimacy of the web site. The testing of forms is described in more detail with respect to  FIGS. 7 and 8 , and similar procedures may be used in this context. 
     The downloaded pages may also be checked to determine whether the pages contain URLs referring to other pages (block  586 ), especially pages external to the web site, including without limitation pages associated with a legitimate business and/or other fraudulent sites, as well whether the pages refer to images hosted on other sites (block  588 ). The presence of either of these types of references may indicate that the web site is relatively more likely to be illegitimate. Merely by way of example, if a web site is spoofing a bank&#39;s web site, the spoofing site may have external URL links to the bank&#39;s actual web site and/or may comprise images hosted by the bank&#39;s web site (so as to appear more authentic). 
     Often, a scammer will move a fraudulent web site (and/or pages from that site) among various servers in an attempt to perform multiple scams and/or avoid detection/prosecution. Further, some scammers purchase (or otherwise acquire) “turnkey” scamming kits comprising pre-built web pages/sites that can be hosted on a server to perform a scam. It follows, therefore, that it can be useful to provide an efficient way to compare URLs and/or web sites from a plurality of investigations. Merely by way of example, in some cases, the method  560  can include generating and/or storing (e.g., in a database, file system, etc.) a checksum and/or hash value associated with the URL and/or page(s) referenced by the URL (e.g., the page directly referenced by the URL and/or the pages crawled in block  580 ) (block  590 ). Merely by way of example, a hashing algorithm may be used to calculate a value for the URL string and/or for the contents of the referenced page(s). Alternatively, a checksum value may be calculated for the contents of these page(s). Either (or both) of these procedures may be used to provide an efficient “snapshot” of a URL, web page and/or web site. (In some cases, a discrete checksum/hash may be generated for a URL, an entire site and/or individual pages from that site). The checksum/hash value(s) may then be compared against other such values (which may be stored, as described above, in a database, file system, etc.) calculated for URLs/web sites investigated previously (block  592 ). If the checksum/hash value matches the value for a web site previously found to be fraudulent, the odds are good that the present site is fraudulent as well. 
     Returning to  FIG. 5A , information about the domain to which the URL resolves may be analyzed (block  540 ), either as a separate step or as a part of the URL analysis. Further, in determining whether a domain is suspicious, the domain may be compared to any brand information contained in the body of the message. For example, if the body of the message includes the brand name of a customer, and the URL resolves to a domain different than a domain owned by and/or associated with that customer, the URL can be considered suspicious. 
     Upon the completion of the analysis (of any portion of a message, as discussed above, and/or of the message as a whole), the data file/message may, in some embodiments be assigned a score (block  545 ). Assigning a score to the data file/message can provide a quantitative measurement of the likelihood that the message is a phish, and in such embodiments, a score can be compared to a threshold score, such that a score meeting a particular threshold can result in further analysis and/or investigation, while a score not meeting that threshold can indicate ajudgment that the email is not a probable phish. In some embodiments, the overall analysis of the message can result in the assignment of a single score. 
     In other embodiments, each type of analysis (e.g., the analysis of the header, of the body, of the URL and/or of the associated domain) can result in the assignment of a separate score, and/or these separate scores can be consolidated to form a composite score that can be assigned to the message. Moreover, the individual scores for each type of analysis may themselves be composite scores. Merely by way of example, each of the tests described with respect to  FIG. 5B  (as well, perhaps as other tests) may result in a score, and the scores of these tests may be consolidated to form a composite URL score. 
     In further embodiments, the analysis of each data file or email message can be performed in hierarchical fashion: the header information may be analyzed and scored, and only if that score meets a certain threshold will the correlation engine proceed to analyze the body. If not, the message is considered not to be a phish and the analysis ends. Likewise, only of the score resulting ftom the body analysis reaches a certain threshold will the URL be analyzed, etc. 
     The score values for various findings can be arbitrary, and they can reflect a judgment of the relative importance of various factors in the analysis. Further, based on the disclosure herein, one skilled in the art can appreciate that the scaling of the scores for various portions of the message (and/or the threshold scores for proceeding to the next stage of analysis) can be adjusted depending on the relative reliability of the analysis of each portion in determining whether the message actually is a phish, as well as the desired degree of precision in identifying possible phish messages. Moreover, the correlation engine can employ an automatic feedback loop, as described above, allowing the correlation engine to be self-tuning if desired for instance, if a particular factor proves to be a reliable indicator in categorizing a message, the correlation engine can automatically begin to give that factor more weight. 
     To understand how a hierarchical scoring system may be implemented in accordance with some embodiments, consider the following, simplified example. An email message with a forged header may be accorded a score of 150, and if a score over 100 is required to proceed to the analysis of the body, that analysis will be performed. The presence of a customer&#39;s name in the body may be worth a score of 1000, and the presence of the term “confirm your credit card” may be worth a score of 2000. A score over 2500 may be required to proceed to URL analysis, so if the message includes both terms, it will have a score of 3150 and will proceed to URL analysis. Finally, if the URL resolves to an IP address, that may be worth a score of 10000. If the threshold composite score for considering a message to be a likely phish is 12000, the composite score of the message (13150) would indicate that the email likely is a phish. (It should be noted that, while, for purposes of illustration, this example requires the assigned score to exceed the threshold score, in other embodiments, a score might have to be lower than the threshold score to meet the threshold. That is, the required relationship between the assigned score and the threshold score is discretionary. It should also be noted that certain factors, such as the presence of a white listed term, can detract from a score.) 
     After the analysis of the message/data file is complete, the message may be categorized as a phish (block  550 ). In some embodiments, a scoring algorithm similar to those discussed above may be used to categorize the message. In some cases, the categorization can depend on an overall and/or composite score for the message, while in other cases, the categorization might depend only on a score for a particular section (e.g., the body portion, the URL, etc.). Other methods of categorization may be used as well. For example, the mere presence of any particular blacklisted term, a URL resolving to a suspicious domain, etc. may cause the message to be categorized as a phish. The choice of criteria for categorization is discretionary. 
     The scoring methodology described above may be applied to the categorization of data (including email messages, URLs, web sites, etc.) in a broader context as well. Merely by way of example, in accordance with some embodiments, a similar scoring system could be used to identify direct email marketing (e.g., from a competitive marketing perspective), to determine whether a business&#39;s products, trademarks, business identity, etc. is being used in an improper manner, etc. With the benefit of this disclosure, those skilled in the art will appreciate that this robust scoring methodology may utilize a variety of different scoring criteria to analyze such data in a wide variety of applications. 
       FIG. 6  illustrates a method  600  for investigating a suspected fraudulent activity. In some cases, a fraudulent activity may be discovered through the analysis of a received email message and/or data obtained from a data source (e.g., via a crawling/monitoring activity, as discussed above). 
     Once a suspected instance of fraud has been uncovered, an event may be created in an event manager (block  605 ). As described above, in accordance with some embodiments of the invention, an event manager can be a computer systems (and/or a software application) that may be configured to track suspected fraudulent activity. In particular embodiments, the event manager may have workflow capabilities, such that an event may be created as a container for all available information about a suspect activity. Merely by way of example, the creation of an event can be similar to the creation of a “trouble ticket” known to those skilled in the art, whereby the event remains open until a final resolution (e.g., classification of the suspect activity as non-fraudulent, cessation of the suspect activity, etc.) renders the event moot, at which point it may be closed. In the interim, various investigative and/or responsive procedures (including without limitation those described in detail below) may be initiated by the event manager (automatically and/or with user interaction) and/or a record of the results of such procedures may be stored and/or tracked by the event manager. All of this information may be contained within an event object. As noted above, in some cases, the event manager can be policy-driven, such that customer policies influence the way a particular event is handled. The event, therefore, may be linked to one or more customer policies, which can inform the behavior of the event manager and/or a technician handling the event. 
     In general, each event may be investigated (block  605 ). In some cases, when an event is opened, a technician might evaluate the event (e.g., by visiting and/or analyzing a web site associated with the event). In other cases, a more rigorous investigation may be performed, for instance by an event manager. 
       FIG. 7  illustrates an exemplary method  700  detailing various procedures that may be undertaken as part of the investigation. At block  705 , the IP address of the server referenced by a URL included in the message may be acquired via any of several well-known methods, such as a DNS query (or, if the URL refers to an IP address instead of a hostname, the URL itself). 
     In addition, an apparent address for the server referenced by the URL may be identified. Those skilled in the art can appreciate that a URL may be associated with an “anchor,” which can be text, an image, etc., such that the anchor appears to be the address for the server referenced by the URL, while the actual URL remains hidden to a casual observer. (In other words, the user may select the anchor in a web browser, email client, etc. to be redirected to the server referenced by the URL). In this way, the anchor may comprise an “apparent address” that actually is different than the address referenced by the URL. Both the apparent address (e.g., the address in the anchor) and the address of the server referenced in the URL (i.e., the actual address in the URL) may comprise a hostname (usually including a domain) and/or an IP address. In addition, the anchor may comprise an identifier for a trusted entity (a business name, etc.) If the apparent address is different than the address actually referenced by the URL (and/or the apparent address comprises an identifier for a trusted entity while the address actually referenced by the URL is not associated with that trusted entity), it may be more likely that the URL is fraudulent and/or that the server reference by the URL is engaged in fraudulent activity. 
     The method  700  may also comprise investigating information about the domain to which the URL resolves (block  710 ), for instance through a domain WHOIS query. This information can show the owner of the domain, the assigned name server for the domain, the geographic location of the domain and administrative contact information for the domain. In addition, information about the IP block to which that domain should be assigned can be investigated (block  715 ), which can elicit similar information to the domain WHOIS query, as well as an indication of which IP block the domain should relate to. Further, the domain information referenced by the URL can be verified (block  720 ), for instance by comparing the IP address obtained through the DNS query (or via the URL, if the URL contains an IP address instead of a hostname) with the IP block to which the domain should belong. Any discrepancy in the domain information can indicate that the domain has been spoofed in the message, providing further evidence that the message is likely a phishing attempt. 
     At block  725 , the server to which the URL refers can be interrogated, using a variety of commercially-available tools, such as port scanners, etc. In some embodiments, the NMAP application and/or the Nessus application may be used to interrogate the server. In a particular set of embodiments, these tools may be incorporated into a proprietary application (which may also perform other investigation, as discussed above) to provide more robust interrogation of the server. The interrogation of the server can indicate what services the server is running (which can provide some indication of whether the server is engaged in fraudulent activity). For instance, if the server is accepting HTTP requests on an unusual port, that service may (or may not) indicate that the server is engaged in fraudulent activity. The interrogation of the server may also show security vulnerabilities, which can indicate that the server may be compromised and therefore may be engaged in fraudulent activity without the knowledge of the server operator. In addition, the route to the server may be traced in a well-known manner, providing more information about the server, its location, and the domain/IP block in which it resides. 
     Interrogating the server can include downloading some or all of the web pages served by that server (using, for example, the WGET command and/or any other HTTP GET function) (block  730 ), especially any pages that appear to masquerade as pages on other servers (spoof pages). The downloaded pages may be analyzed to determine whether the pages request any personal information and/or provide fields for a user to provide personal information (block  735 ). Further, downloaded pages may be archived (block  740 ), which can allow a technician and/or the customer to view the pages to assist in any necessary human evaluation of whether the pages actually are fraudulently requesting personal information. In some cases, a representation of the pages may be saved, as described in detail herein. 
     Finally, an event report may be generated (block  745 ). The event report may include any or all of the information obtained through the investigation, including any archived pages. The event report may be consulted by a technician and/or provided to a customer to assist in formulating a response strategy. In some cases, a redacted version of the event report may be provided to the customer. 
     Returning once again to  FIG. 6 , the results of the investigation may be reported (block  615 ), for instance by displaying a copy of the event report to a technician at a monitoring center (or any other location). Optionally, the technician may analyze the report (block  620 ) to provide a reality check on the information obtained in the investigation and/or to formulate a response strategy. The customer may be notified of the event and/or of the investigation results (block  625 ), by an automated email message, phone call from a technician, etc. The technician may also confer with the customer (block  630 ) to allow the customer to make a decision with respect to how to respond to the attempted fraud. Alternatively, a customer profile may indicate that a specific response strategy should be pursued, such that the customer need not be consulted before formulating a response strategy. 
     If the investigation and/or event report indicates that the server is engaging in fraudulent activity, the method  600  can include responding to the fraudulent activity. Any such response may be initiated and/or pursued automatically and/or manually (i.e., at the direction of a technician). Responses can take a variety of forms. Merely by way of example, the customer, customer policy and/or technician may determine that an administrative response (block  635 ) is appropriate. An administrative response can include any response that does not involve a direct response against the server. For example, one possible administrative response is notifying the ISP hosting the server and/or the registrar for the server&#39;s domain that the server is engaged in fraudulent activity. Another administrative response could be notifying legal authorities about the fraudulent activity and/or preparing evidence for a case under the Uniform Domain-Name-Dispute Resolution Policy (“UDRP”). If the investigation reveals that the server may have been compromised, an administrative response can include notifying the server operator (perhaps via contact information obtained during the investigation of the event) that the server has been compromised and/or providing advice on how to secure the server to avoid future compromises. 
     In addition (or as an alternative) to administrative responses, it may be desirable to pursue a direct technical response against the server (block  640 ).  FIG. 8  illustrates an exemplary method  800  for pursuing a technical response against a server. The method  800  can include parsing a spoofed web page to identify fields in which a user may provide personal information (block  805 ). Those skilled in the art will recognize that an online form (such as an HTML form, etc.) comprises one or more fields, and that those fields generally include a label indicating the information that should be entered. In accordance with some embodiments, therefore, a set of requested fields from the web page may be analyzed (block  810 ); for instance the label accompanying each field can be analyzed to determine whether the field requests personal information, and in what format the information should be submitted. This analysis can include a search for common words, such as “first name,” “credit card,” “expiration,” etc., as well as an analysis of any restrictions imposed by the field (e.g., data type, length, etc.) A set of “safe” data may be generated to populate the fields requesting personal information (and/or any other necessary fields) (block  815 ). In some cases, the safe data can correspond to a safe account, as discussed above. In any event, the safe data can comprise data that appears to be valid (and in fact may be valid, in that it corresponds to a valid account) but that does not pertain to any real account holder or other person. The safe data can be drawn from a database and/or dictionary of safe data (e.g., fictitious first and last names, addresses, etc.) and/or generated algorithmically (e.g., account numbers, credit card numbers, expiration dates, etc.) and/or some combination of the two. 
     Based on the analysis of the requested fields, the safe data can be mapped to the requested fields (block  820 ), such that the data is formatted to appear to be actual personal information for a user. Merely by way of example, if a field requests a credit card number, safe data representing an apparently valid credit card number (e.g. a sixteen digit number starting with a “4,” which would appear to be a valid Visa™ credit card number) can be mapped to that field. A responsive message may be generated and/or formatted to look like a filled-out form from the spoofed web page (block  825 ) and then may be submitted to the server. This process can be repeated as necessary, creating a plurality of “safe” responses. 
     In many cases, a phisher will attempt to filter responses, in order to avoid the deleterious effects of safe data on his collection of acquired data, to avoid the snare of “Marked Money™” (which is discussed in further detail below), and/or for other reasons. Phishers may attempt to use a variety of devices to filter received responses. One type of filtering involves the examination and/or filtering of responses from a particular IP address and/or domain (or set of addresses/domains) the phisher suspects might not be real responses to the phishing scam. Methods of the invention can implement countermeasures, including without limitation those discussed below, to avoid this type of filtration. 
     One type of filtration can be loosely termed “data verification,” and it involves the use of various techniques to check the submitted responses for consistency. Merely by way of example, if the phisher&#39;s web site collects data that is formatted according to a standard (which may be an industry standard, a published standard, etc.), the phisher may implement controls (which can be software applications and/or portable software residing on the phisher&#39;s web server, in the phish email, etc.) to check submitted responses for consistency with such standards. To avoid filtration of safe responses, therefore, the method  800  can implement countermeasures such as identifying and/or evaluating any such standards that may be applicable (block  830 ). For example, the method  800  can include evaluating each of the response fields to determine whether any standards apply to that field, and if so, determining how the standard is implemented. Merely by way of example, as discussed above, credit card networks have developed standards for ensuring the consistency and/or validity of credit card numbers. If a field asks for a credit card number, therefore, the method  800  could include identifying the proper standard for appropriate responses. Similar standards exist for bank routing (“RTN”) numbers, etc. As another, perhaps simpler, example, if a web site requires the submission of an email address, the method  800  can include identifying the requirements for a valid email address (e.g., user@domain.tld). (Other procedures involving the validation of email addresses are discussed below.) In some cases, therefore, the system may comprise logic and/or data structures for identifying common field types and/or correlating those field types with the appropriate standard for data submitted in response to those field types. 
     Phishers sometimes also use one or more embedded tests to validate responses, and the method  800  therefore can comprise countermeasures to defeat such embedded tests. Such countermeasures can include without limitation identifying and/or analyzing such embedded tests (block  835 ). Merely by way of example, the web server and/or the email message may include portable code (such as a Java applet, a JavaScript, a CGI application, etc.) and/or other devices designed to track, identify and/or ignore responses not generated as a result of a phish mailing and/or sent repetitively. Such devices can include, again merely by way of example, counters, timers, cookies, hash values and/or the like. Identifying and/or analyzing such devices can include scanning/parsing an email message and/or web site for the existence of such code, downloading such code and/or executing the code in a sandbox to determine how it operates, and/or reverse-engineering the code to determine how responses are validated. As a simple example, a web site might set a cookie that identifies a particular computer, such that multiple responses from that computer may be identified and/or filtered by the phisher. Identifying and/or analyzing this device can comprise examining the contents of the cookie, so that a modified cookie (which could, for example, change and/or remove the identifying information) could be sent with each response. In other cases, the device might include a counter that is incremented for each access to the web site from a particular computer, and that timer might be identified so that appropriate countermeasures could be taken. In yet other cases, a timer might be implemented to prevent a plurality of responses being sent within a certain time frame, and/or a hash algorithm may be applied to responses, etc., e.g., to identify the responses. 
     In other cases, a phisher may attempt to validate responses based on information about and/or contained in a phish email designed to trigger the response, often requiring the response to comport in some fashion with the email to which it responds. Such strategies can be said to involve “round-trip” information; that is, certain data is sent by the phisher in the email address, and corresponding data is expected to be returned on the “round trip” to the web server. These techniques can be used, for example, to filter responses that do not appear to correlate to any email sent by the phisher, on the assumption that such responses are bogus and/or comprise safe data. Accordingly, the method  800  can comprise countermeasures to defeat attempts by the phisher to user such round-trip information to filter responses. Such countermeasures can include, for instance, identifying and/or analyzing any such “round trip” information (block  840 ). Round trip information may be identified and/or analyzed through a variety of procedures. 
     Merely by way of example, a phisher may retain a list of addresses to which a particular phish message was sent and also require responses to include an email address. The phisher can then filter responses by email address, such that any responses listing an email address not include on the list maintained by the phisher are considered bogus. Alternatively, the phisher may include a response code in each of the phish messages and require responses to provide the response code, then filtering any responses that do not include the response code. (In particular cases, the response code may be keyed to the day of the phish transmission, to the address to which the phish message was transmitted, and/or any other variable, for instance by using portable code in the phish message, and/or analyzing the round trip information can comprising analyzing such portable code, in a manner similar to that discussed above.) 
     Identifying and/or analyzing such round trip information can include analyzing the phish message and/or the response web page; in many cases, a comparison of the phish message and the response web page will reveal the use of round trip information. Further, a collection of phish messages (each of which, perhaps, being collected by a honeypot, as described above, and/or by another method) can reveal similarities and/or patterns that allow for the identification and/or analysis of round trip information. Merely by way of example, the recipient addresses on a plurality of phish emails appearing to originate from a common email “blast” may be compared to find commonalities and/or differences (in recipient addresses and/or domains, in response codes, in included portable code, etc.). This comparison can help in the formulation of responses that will not be filtered by the phisher. 
     In particular cases, a phisher may use one or more of the above techniques in an attempt to filter responses. Moreover, since phishers often operate their web sites on compromised servers (as discussed above), phishers often have incentives to make their filtering procedures as “lightweight” as possible, to avoid imposing a significant load on the compromised server (which could alert the operator of the server to the compromise, for example). Hence, phishers often attempt to generalize their filtering techniques to allow for more efficient searching. Merely by way of example, instead of filtering for particular email addresses corresponding to transmitted phish emails, a phisher may limit a particular spam burst to addresses at a single domain, such as “aol.com” (or a plurality of selected domains) and require an email address as part of responses submitted to a corresponding web site. Any responses listing an email address with a domain different than the domain to which the email blast is addressed may then be filtered. This procedure may prove to be significantly more efficient (from a computing resources standpoint) than actually comparing individual email addresses. The procedures of identifying round trip information (and/or any other devices) may reveal patterns indicating such “shortcuts,” and/or these shortcuts may be exploited in forming responses. Merely by way of example, if an analysis of a collection of phish emails indicates that a particular blast was directed to users at a particular domain, it may be the case that any response using providing an email address in that domain (and/or appearing to originate from a host in that domain) will be accepted by the phisher&#39;s filtering procedures. 
     Hence, the method  800  can include ensuring (block  845 ) that responses to be transmitted to the phisher&#39;s web server meet criteria identified and/or analyzed in blocks  830 - 840  (and/or any other identified validation criteria). Based on the disclosure herein, one skilled in the art will appreciate that ensuring the responses meet a given criteria will often be highly on the nature of the identified criteria. Merely by way of example, if the criteria is that a particular returned value must conform to an industry standard (such as a credit card number, for example), the method  800  likely would include ensuring that all responses included validly-formatted credit card numbers. As another example, if analysis of round trip information indicates that the phish email blast appears only to have transmitted messages to users at a certain domain and/or ISP, the method  800  could ensure that all responses submitted include an address associated with that domain. As yet another example, if an embedded test is identified (for example, by reverse engineering portable code, as discussed above), the method  800  can ensure that each response will be considered valid when evaluated by that portable code (for example, by creating responses compliant with the code and/or by executing the code on the response before transmission to the web server to test the result). 
     Hence, the method  800  can include countermeasures designed to circumvent any filtering techniques (and, in particular, any content-based filtering techniques) implemented by the phisher. It may be noted that the procedures discussed with respect to blocks  830 - 845  have been illustrated as occurring after responses have been formatted (block  825 ). In some embodiments, however, it may be relatively more efficient to perform these procedures at other points in the method  800 , such as before generating safe data (block  815 ) and/or before formatting responses (block  825 ). 
     Safe responses (and/or any other appropriate response and/or request, which could include, for instance, generic HTTP requests, other types of IP communications/packets, etc.) may be submitted to the server in a number and frequency determined by a response strategy. For instance, a “respond to confuse” strategy may be employed, whereby relatively few safe responses are submitted to the server (block  850 ). This strategy can have the effect of introducing invalid data into the server&#39;s database, thereby causing uncertainty for the phisher about which of the data collected actually represents valid personal information that can be exploited and which of the data collected is mere garbage. This alone can significantly affect the profitability of a phishing scam and may be sufficient to prevent the phisher from exploiting significant amounts of valid personal information received from actual consumers. In addition, if the safe data is associated with a safe account, and the phisher attempts to exploit the safe data, the phisher&#39;s use of that data can be traced, and an evidentiary trail of the phisher&#39;s activities can be compiled, aiding the identification of the phisher and possibly providing evidence for a civil litigation or criminal prosecution. 
     If desired, a “respond to impede” strategy can be pursued (block  855 ). In this strategy, safe responses can be transmitted in greater numbers and/or at a greater rate. Safe responses can also be sent from a plurality of response computers, which can reside in different domains and/or IP blocks, preventing easy detection by the phisher of which responses comprise safe information (and are therefore useless to the phisher). In addition to the benefits of the “respond to confuse” strategy (which are in fact magnified under this strategy), the “respond to impede” strategy may signal to the phisher that his scam has been discovered, possibly providing a deterrent against continuing with the scam. 
     If a more aggressive response is desired, a “respond to prevent” strategy may be undertaken (block  860 ). The respond to prevent strategy can involve transmitting large numbers of safe responses at a high rate from numerous, possibly widely-distributed, response computers. In fact, response rates can be sufficiently high to effectively prevent the server from being able to accept any substantial quantity of real responses from actual consumers or others, effectively terminating the scam. This strategy can be pursued until the server stops accepting responses, and may in fact be continued in case the server once again begins accepting responses. 
     Finally, in some cases, a “respond to contain” strategy may be employed (block  865 ). This strategy involves submitting sufficient HTTP requests to a web server operating a spoof scam to effectively disable the server&#39;s ability to service requests. Those skilled in the art will appreciate that typical web servers often implement a connection table, which tracks and limits the number of HTTP connections the server may service at any given time. In accordance with embodiments of the invention, therefore, sufficient simultaneous HTTP requests may be submitted (perhaps by a distributed systems of computers, as described above) to “fill up” the web server&#39;s connection table and thereby prevent the server from accepting any more requests. This process may be continued indefinitely until the fraudulent web site is removed. The HTTP requests may comprise safe responses (as described above) but, in this case, need not. Any generic HTTP request (such as an HTTP GET request) generally will suffice to create a connection and thereby occupy an entry in a connection table. 
     It is worth noting that this technique is different from a generalized attack (e.g., the transmission of an overwhelming number of IP packets) on the system/network from which the online fraud is being perpetrated, in that the number of HTTP requests required to fill a connection table generally will not be high enough to have a significant impact on the network infrastructure. Further, the system running the web server generally will remain otherwise available—it simply will not be above to service HTTP requests. In this way, the fraudulent activity may be impaired or prevented without causing excessive collateral damage to network infrastructure, etc. Of course, a generalized attack (of any variety) could also be used to accomplish this purpose, but such attacks may be infeasible in some cases, e.g., due to ethical and/or political considerations. 
     If desired, the use of responsive information may be traced (block  870 ). As described above, safe responses can comprise information (such as apparently valid credit card numbers) that is not associated with any real user. If the perpetrator of a scam attempts to use such information, the use of that information may be traced to identify the perpetrator. Merely by way of example, if the customer is a bank or credit card issuer, an account associated with a “safe” account number could be opened (or the “safe” account number could otherwise be monitored), and any attempts to access that account (e.g., attempted withdrawals or credit card authorizations) could be flagged for further investigation. This use of “marked money” has been used by authorities in other contexts, such as providing marked cash to bank robbers, then tracing the bank robbers by following the trail of the marked money as it is spend or otherwise distributed. Similar concepts may be implemented in accordance with embodiments of the invention, using the technologies described herein. 
     Sophisticated phishers may also attempt to filter responses according to the origin of the responses. Merely by way of example, if a phisher detects multiple responses from a single IP address (and/or from a range of similar IP addresses), from a single domain, etc., that phisher may filter responses from that IP address/range/domain, on the theory that a plurality of responses from a single location indicate that someone has discovered his scam and is attempting to identify him, submit safe responses, etc. Hence, the method  800  can include one or more procedures designed to defeat such attempts by the phisher. Merely by way of example, one strategy described above involves the use of multiple computers and/or multiple IP addresses to transmit responses in distributed fashion. In some cases, it may be advantageous to provide a diversity of IP addresses (which may be from different address blocks, etc.) to impede the phisher&#39;s ability to identify responses generated according to methods of the invention. 
     One strategy for transmitting a from a plurality of diverse IP address can comprise acquiring a plurality of diverse IP addresses (block  875 ), for instance by purchasing (or otherwise obtaining) relatively “disposable” or temporary IP addresses from a plurality of providers, for instance, by opening accounts with a plurality of different ISPs. In some cases, it may be advantageous to obtain IP addresses associated with (e.g., assigned to) retail ISPs, such as MSN, AOL, etc., because responses from such addresses may be assumed to originate from consumers, often the prime target of a phisher. (A retail ISP can be considered any ISP that provides Internet connectivity to consumers, as opposed to those ISPs that provide connectivity and/or other services merely to businesses.) In some cases, arrangements may be made with such ISPs simply to use addresses temporarily. The method  800 , then, can further include assigning each of the plurality of IP addresses to a computer (and/or other device) configured to generate responses, e.g., in accordance with methods of the invention, and/or to transmit such responses to the phisher&#39;s web server (block  880 ). In some embodiments, each of these computers may be logged on to an appropriate ISP (e.g., the ISP with which the assigned IP address is associated) in order to use the IP address, such that any responses transmitted by the computers will be transmitted via the ISP. Further, in certain embodiments, these computers may be controlled by one or more central computers. In other embodiments, the responses may be generated at one or more central computers and then transmitted to the computers assigned the plurality of IP addresses, which could then forward the responses (perhaps with some modification), such that the responses appear to originate from these computers/IP addresses. 
     Another strategy which can be employed in accordance with embodiments of the invention is the use of a megaproxy (or similar technology) (block  885 ) to provide responses from a single computer (or set of computers), but wherein each of the responses appears to originate from a different IP address, domain and/or network block. Examples of such procedures are described in U.S. Prov. Pat. App. No. 60/610,716, already incorporated by reference herein. Using these and similar procedures, a group of requests may be made to appear as originating from a variety of sources, frustrating the phisher&#39;s attempts to filter the responses and/or forcing the phisher to block actual consumer responses in attempting to block safe responses generated in accordance with methods of the invention. 
     Merely by way of example,  FIG. 9A  illustrates a system  900  that may be used to submit responses to a phishing scam. The system  900  works by using one or more network blocks (e.g., blocks of IP addresses) assigned to one or more entities  905 , which can include, in some cases, major consumer ISPs, such as Comcast, America Online (“AOL”), the Microsoft Network (“MSN”), etc. The network blocks may be “donated” by these entities for use in an anti-phishing solution. (Although the term “donated” is used herein for ease of description, one should not infer that title to the network blocks necessarily is transferred to the security provider or that the blocks are provided without remuneration. In some embodiments, for example, a security provider may purchase or lease blocks for use in accordance with embodiments of the invention, or the blocks may be temporarily loaned to the security provider for such use. In other embodiments, the ISP need not even be aware of the purpose for which the blocks are to be used—those skilled in the art will appreciate that the allocation of dedicated network blocks from an ISP to a business for that business&#39; use is commonplace.) 
     The donated blocks may be relatively permanently assigned to a security provider, etc. and/or may be assigned on an ad hoc basis. Such blocks may be provided by these entities  905  via interior routing protocols, and/or a record of the donated blocks may be stored in a database  910 , for use by the anti-fraud system  900 . The anti-fraud system  900  can also include a network meet-me center  915 , which can be any facility that provides an opaque connection between the network blocks and the rest of the Internet (and in particular, the perpetrator of online fraud). The meet-me center  915  can provide the ability to submit a plurality of responses/requests  930  (e.g., HTTP POST or HTTP GET commands) to a scammer&#39;s server  250 . By way of example, the responses  930  may be similar to the responses discussed above. 
     The meet-me center  915  may comprise a dilution engine  920 , which may function in similar fashion to the dilution engines described above. (Alternatively, the meet-me center  915  may be in communication with a dilution engine maintained by a security provider, perhaps as part of a system such as the system  100  in  FIG. 1A  and/or the system  200  of  FIG. 2 .) Merely by way of example, the dilution engine  920  may be a software application that is designed to create and/or format the responses/requests  930  (perhaps in the manner discussed above), as well as a mega-proxy  925 , which can make the responses/requests  930  appear to be originating from any of the IP addresses contained within the network blocks stored in the database  910 . In operation, therefore, the dilution engine  920  may compose many responses/requests  930 . As described in the above, these requests/responses  930  may be formatted to appear as legitimate responses to the phishing scam and/or may simply be generic requests designed to occupy the server&#39;s ability to service other requests. The mega-proxy  925  will forward those responses/requests  930 , using any appropriate address (e.g., an IP address within the blocks stored in the database  910 , as described above) as the originating address, to the spoofer&#39;s website  940 . As noted above, the responses/requests  930  can be designed to feed incorrect personal information to the website  940  and/or merely to occupy the website and thereby impede its ability to defraud others. The scammer may use a filter  935  (such as a firewall application configured to block communications from particular IP blocks, domains, etc.) to attempt to block the responses/requests  930 , but this will prove problematic for the scammer, for one or more of the following reasons. 
     First, since the responses/requests  930  will appear to be originating from a variety of different IP addresses (and, in many cases, from a variety of different domains and/or ISPs, it will be difficult for the scammer to determine which of the responses/requests it receives are from the system  900  and which are from ordinary consumers. While in some cases, it may be technically possible to determine which responses/requests are from the system  900 , making such a determination usually will involve relatively expensive equipment and significant processing power, and those skilled in the art will appreciate that online fraud schemes are often operated by those without the financial resources to invest in such equipment. In addition, because many online fraud sites are operated on compromised servers operated not by the scammer but by an innocent third party, it often will be difficult for the spoofer to marshal the required computing resources to perform in-depth analysis, at least without alerting the owner of the server to the compromise. 
     Further, even if the scammer is successful at identifying the requests/responses  930  from the system  900  and manages to block some of these requests/responses  930 , the fact that those requests/responses  930  often will appear to be originating from major consumer ISPs (e.g.,  905 ), the scammer will be in the difficult position of having to block IP addresses associated with the scammer&#39;s prime target: the average consumer. In this way, the system  900  can provide multiple benefits, not only making it difficult and/or expensive for the scammer to block the requests/responses  930 , but also using the scammer&#39;s attempts to block the requests/responses  930  against the scammer, by causing the scammer to block network blocks that also include addresses assigned to ordinary users, thereby blocking responses from the very people the scammer hopes to attract. 
       FIG. 9B   950  illustrates a method of submitting responses to a web server. The method may be implemented in using a system such as the system  900  of  FIG. 9A , although the methods of the invention are not limited to any particular hardware or software implementation. The method  950  can include acquiring one or more IP blocks (block  955 ) (that is, blocks of available IP addresses). As noted above, it may be useful in some cases for the IP blocks to be acquired from a plurality of ISPs (including retail ISPs), in order that responses generated by the method  900  appear to originate from within such ISPs (and, in particular cases, from customers of the retail ISPs, such as consumers). Various strategies for acquiring IP blocks are discussed above, and any of these strategies may be used in accordance with embodiments of the invention. In accordance with some embodiments, a record of the acquired IP addresses and/or blocks may be stored (e.g., in a database) (block  960 ). 
     The method  950  can further include providing a mega-proxy (such as, for example, a mega-proxy similar to the mega-proxy  925  described with respect to  FIG. 9A ) and/or any other device or software application capable of transmitting IP packets (and, in particular cases, HTTP requests) that appear to originate from a variety of different sources (block  965 ). Providing a mega-proxy can comprise situating the mega-proxy at a network meet-me center, which can be, for instance, a peering facility that provides the ability for multiple ISPs to communicate using interior routing protocols. In other embodiments, the mega-proxy can be situated elsewhere, so long as the mega-proxy is able to transmit packets using the acquired IP addresses. 
     Once an illegitimate web site is identified (block  970 ), for instance, using the methods discussed above, a response (e.g., an HTTP request) may be created, using, for example, the methods discussed above (block  975 ). The mega-proxy then can obtain an IP address (for example, by searching a database of acquired IP addresses) (block  980 ), and transmit the response to the illegitimate web server (block  985 ), such that the response originates from the IP address obtained by the mega-proxy. This process may be repeated for a plurality of responses (as indicated by the broken line in  FIG. 9B ). In some cases, a new IP address may be obtained for each response to be transmitted. In other cases, a particular IP address may be used to transmit a plurality of responses. In this manner, a plurality of responses (which may, in some cases, comprise “safe” data as described above) may be transmitted to the illegitimate web server. 
     Returning now to  FIG. 8 , another strategy for responding to an illegitimate web site can implement “proxy chaining” (block  885 ). Proxy chaining involves the transmission of response packets through a variety of proxy servers before their final transmission to the phisher&#39;s web server. In one embodiment of proxy chaining, a fraud-prevention system (such as the system  100  described above) can include connections to a variety of different ISPs (and, in particular, retail ISPs), via a plurality of dedicated connections, modem connections, etc. Responses may be sent through such connections, thereby utilizing the proxy servers of these ISPs to actually submit the request on behalf of the fraud-prevention system. When the phisher receives the responses, the responses will appear to originate from those retail ISPs, preventing the phisher from determining (and thus from easily being able to block) the actual machines from which the responses originated. In another embodiment, request may be sent through a plurality of proxy servers, perhaps in serial fashion, making it even more difficult for the phisher to determine the origination of the responses. 
       FIG. 10  illustrates a system  1000  that can be used to submit responses using a proxy-chaining strategy. The system  1000  comprises a fraud prevention system  1005 , which can be similar to the systems illustrated by  FIGS. 1A ,  2  and/or  11  (and/or can include components similar to those described with respect to those systems), and/or can perform various methods of the invention. In particular, the fraud prevention system  1005  can be configured to carry out a technical response (such as a dilution response) against an illegitimate web server  250 . The fraud prevention system  1005  may include one or more proxies  1010 , which as one skilled in the art will appreciate, can be used to forward responses from the fraud prevention system  1005 . The proxies  1010  can be SOCKS proxies, HTTP proxies, CGI proxies and/or any other type of Internet proxy known in the art. 
     As those skilled in the art will appreciate, a proxy can be used to disguise header information that may be used to identify a computer (such as a dilution engine and/or a response computer) that creates and/or formats responses for transmission to the illegitimate web site  250 . In some embodiments, the proxies  1010  can be used to transmit responses directly to the web site  250 . In such embodiments, however, the proxies  1010  may be identified by a scammer as part of a fraud prevention system  1005  (since they will be transmitting the dilution responses, for example, to the server  250 ). To prevent such identification, the responses may be transmitted by the fraud detection system  1005  (either through the proxies  1010  or directly) to other proxies for transmission to the server  250 . 
     Merely by way of example, the fraud prevention system  1005 —and/or an ISP (not shown) hosting the fraud prevention system  1005 —may have a peering relationship (as is known in the art) with one or more data centers  1015  (which may themselves be ISPs and/or hosted by ISPS). The responses may be transmitted to these data centers  1015 , either through a direct peering connection or via the Internet  205 , and the data centers  1015  may transmit these responses to the server  250 , often through their own proxies  1020 . 
     The proxies  1020 , like all of the proxies discussed herein, can be anonymous proxies. Further, in certain embodiments, the proxies discussed herein may be “distorting” proxies, which can omit and/or substitute false or pseudorandom data into certain fields in HTTP requests (which can comprise the dilution responses), such as the “HTTP_VIA” and “HTTP_X_FORWARDED_FOR” fields, thereby disguising the fact that they are serving as proxies and/or obscuring the fraud prevention system  1005  (and/or components of that system) as the actual sources of the HTTP requests. The data center proxies  1020  (and other proxies discussed herein) thus can serve to “anonymize” the responses vis-á-vis the fraud prevention system, further isolating the fraud prevention system  1005  from detection by the server  250  (or an operator of a scam on the server  250 ). 
     In accordance with other embodiments of the invention, the fraud prevention system  1005  may incorporate a private branch exchange (“PBX”) system  1025  (and/or any other means of providing one or more available telephone (POTS, ISDN or other) lines in communication with the fraud prevention system  1005 . The PBX  1025  may be in communication with a modem pool  1030  (or similar device) and thus can be used to provide communication with one or more ISPs  1035 , as indicated by the broken lines on  FIG. 10 . (In other embodiments, other means for providing communication with the ISPs  1035  may be used as well). Responses, therefore, may be routed through one or more ISPs  1035  (and, in some embodiments, transmitted to one or more proxies  1040  operated by the ISP(s)  1035 ), which would forward the responses to the server  250 . In some cases, one or more of the ISPs  1035  may be retail ISPs, providing the additional benefit of making the responses appear to originate from consumer customers of the ISPs, as discussed above. 
     In particular embodiments, the fraud prevention system  1005  may be configured to route responses through a plurality of proxies (including any of the proxies  1010 ,  1020 ,  1040  depicted on  FIG. 10 ) using a proxy-chaining technique. Merely by way of example, a response such as an HTTP request might be transmitted from the fraud prevention system  1005  to a data center  1015   a  (perhaps via a proxy  1010   a ), where the request is forwarded by the data center&#39;s proxy server  1020   a  to another data center  1020   b  (or, alternatively, to an ISP  1035   a ), where another proxy server  1020   b  forwards the request to the web server  250  (the forwarding between links in the proxy chain can be done via a peering connection, modem connection, the Internet, etc.). This technique can, under some circumstances, provide more comprehensive “anonymizing” of the responses, making it relatively more difficult for the web server  250  (and/or a scammer using the web server  250 ) to identify the source of the responses. Further, in some embodiments, the proxy servers  1010  of the fraud prevention system  1005  (and/or other components of the system  1005 , such as dilution engines, response computers, etc., which are not shown on  FIG. 10 ), can be configured to distribute a plurality of responses among various proxies (e.g.,  1020 ,  1040 ), randomly, in rotation, etc., to further disguise the source of the responses. 
     Hence, various embodiments of the invention provide several different procedures to circumvent filtering or blocking techniques (whether based on the content of the responses or the origination of those responses). These procedures, which may be used separately or in any combination, make it difficult for the phisher to separate responses submitted by actual, scammed consumers from responses generated by methods of the invention. In this way, the response and/or “marked money” techniques discussed herein, as well as other anti-fraud processes, may be implemented more effectively. 
     In another set of embodiments of the invention, a monitoring appliance can be used to provide notice of a phishing scam (or other illegitimate use of a customer&#39;s online identity) through messages received by the customer&#39;s system.  FIG. 11  illustrates a system  1100  that may be used to identify such an event, and  FIG. 12  illustrates an exemplary method for identifying such an event. 
     Merely by way of example, the system  1100  of  FIG. 11  can be configured to capture, inter alia, phishing events, in some cases, at a relatively early stage in the phishing scam (i.e., when phish messages originally are transmitted to prospective victims and/or participants in the phishing scam). The system  1100  be configured to operate, in some respects, similarly to the system  200  described with respect to  FIG. 2 . (It should be noted that the system  1100  of  FIG. 11  may include components similar to those of the system  200  of  FIG. 2 , although, for ease of illustration, not all components are shown on  FIG. 11 .) A system similar to the system  1100  is described in detail in commonly-assigned, co-pending U.S. Prov. App. No. 60/610,715, already incorporated by reference. 
     Those skilled in the art will appreciate that, when perpetrating a phishing and/or spoofing scam, a scammer often will generate bulk email transmissions, seeking (for example) to induce recipients to log onto the scammer&#39;s web site, which may be engineered to appear to be the website of a legitimate (and often well-known) business, such as a bank, online commerce site, etc. To enhance the scam, therefore, the scammer often attempts to replicate and/or imitate as closely as possible an actual email message from the legitimate business. Hence, in many cases, certain fields in the message header (such as, for example, the “FROM:,” “SENDER:,” “RETURN PATH:,” and/or “REPLY-TO:” fields) may be copied from, and/or forged to appear as, corresponding headers from an actual message sent by the legitimate business. 
     Although the inclusion of such false header information may help scammers to confuse the recipients of such messages, the false header information may also be used to help detect a potential online abuse, such as an attempted fraud. Those skilled in the art will appreciate that, when a mail server receives an electronic message addressed to an address at that mail server, the mail server will attempt to route the message to a mailbox associated with that message. When there is no such mailbox, the mail server often will use one or more of these fields (such as, for instance, the “RETURN-PATH:” field) to send a “bounce” message in an attempt to notify the sender of the message that the message could not be delivered to the address specified in the message. When the message&#39;s header information indicates that the legitimate business was the sender of the message, however (as, for example, when the scammer wishes to make the message appear authentic), the “bounce” message will be transmitted not back to the scammer, but instead to the legitimate business. 
     Moreover, because in many cases, the “bounce” message will have appended to it a copy of the original message (or a portion thereof) sent by the scammer, significant information may be gleaned from the bounce message, using, for instance, the methods and/or systems described below. And because scammers often send bursts of messages to large groups of unverified email addresses, there is a relatively high likelihood that any given burst of messages will include a substantial portion of undeliverable messages. Hence, an analysis of messages received by the legitimate business can facilitate the early detection of possible online abuses. 
     The system  1100  of  FIG. 11  can be used to for this process. In addition to the components described with respect to  FIG. 2 , the system  1100  can additionally feature a monitoring appliance  1105 , which may be located at the site of a customer  225  in particular embodiments. In other embodiments, however, the monitoring appliance  1105  may be located elsewhere (including at a monitoring center  215 , etc.). In accordance with some embodiments, the monitoring appliance  1105  may comprise a general purpose computer (such as the computers described above, for example), perhaps with software for interfacing with the customer&#39;s email system and/or for performing other tasks described below (including, without limitation, methods of the invention). In other embodiments, the monitoring appliance  1105  may be a special purpose machine, with hardware, firmware and/or software instructions for performing these tasks. 
     The monitoring appliance  1105  may in communication with the customer&#39;s email system  1110 . The legitimate business, (i.e., the customer) may be any entity that is concerned about phishing scams (or otherwise would like to be aware of mailings purporting to originate from that business), including without limitation an organization that has an online presence and/or would be expected to communicate with consumers, members, etc. via email (such as, for example, a bank, an online commerce web site, an online auction site, etc.). The email system  1110  can include, without limitation, an SMTP server, a POP3 server, a mail transfer agent (“MTA”), and/or any other commonly-available email server and/or client software. Standard email systems may be used in accordance with some embodiments of the invention. In other embodiments, the email system  1110  may be specially-configured (e.g., to integrate with the monitoring appliance  1105 ). 
     The monitoring appliance  1105  may be operated by the customer and/or may be operated by a third-party, such as a security service provider, etc. The monitoring appliance  1105  may be situated in proximity to the email system  1110  and/or may be remote from the email system  1110 , so long as it is in communication with the email system  1110 . In accordance with some embodiments, the monitoring appliance may be in communication with and/or integrated with an email gateway, MTA, SMTP server, etc. such that the monitoring appliance has access to every email message incoming to the email system  1110 . (In particular cases, the monitoring appliance  1105  may be embodied by a modification to a standard mail system component, so that the monitoring appliance  1105  is in fact part of the email system  1110 ). In other cases, the system  1100  may be configured so that the email system  1110  (and/or a component thereof) sends copies of particular messages (e.g., messages meeting certain criteria that might identify those messages as “bounce” messages) to the monitoring appliance  1105 . 
     The monitoring appliance  1105  may be in further communication with (and/or incorporate) a fraud prevention and/or detection system configured to analyze received email messages, including for example, a master computer  210 , monitoring computer  220 , and/or any other system components described with respect to  FIG. 2 . Hence, the monitoring appliance  1105  may be in direct or indirect communication with a correlation engine (such as, for example, the correlation engine  125  described with respect to  FIG. 1A ) and/or an event manager (such as the event manager  135  of  FIG. 1A ), either or both which can be used to analyze email messages, including in particular “bounce” messages, received by the email system  1110 , perhaps using methods described in further detail below. The correlation engine, which may be (but need not be) part of a larger fraud detection and/or prevention system, may be situated locally to the customer. In other cases, however, the correlation engine may be located off-site. As such, the correlation engine may be managed by a security provider and/or used to analyze incidents of possible fraud based on data received from a variety of sources, including without limitation, various customers, other data sources (some of which are described herein), etc. 
     The following example illustrates one mode of operation of the system  1100 . In this example, it is assumed that the customer is a bank. A scammer creates an email message that is addressed to a plurality of addresses, some of which the scammer assumes will be customers of the bank. This “original” message appears to be addressed to “a valued customer” and to originate from the bank, and in fact, the return path of the message lists the bank&#39;s email system  1110  (or an address associated with the bank&#39;s email system) in the “RETURN PATH:” field of the message. The scammer uses a mail server  1115  to send this original message to many (perhaps hundreds or thousands) of addresses culled from a spam list maintained by the scammer (or another). (Those skilled in the art will recognize that a phisher often will use compromised email servers, open relays, etc. to send phish emails, but for purposes of this example, such distinctions are unimportant.) Assuming that one of these addresses is &lt;joe_user@user.com&gt;, the scammer&#39;s email server  1115  will transmit the message to a mail server  1130  associated with the &lt;user.com&gt; domain, for receipt by a user “joe_user.” If “joe_user” is not known to the &lt;user.com&gt; mail server  1130 , that mail server  1130  will attempt to send a return, “bounce” message to the sender of the original message, as discussed above. Because the “RETURN PATH:” field points to the bank&#39;s email system  1110 , however, the &lt;user.com&gt; mail server  1130  will send the “bounce” message to the bank&#39;s system  1110 , instead of to the actual sender (the scammer&#39;s email server  1115 ). 
     When the bank&#39;s email system  1110  receives this message, it can identify it as a “bounce” message and forward it to the monitoring appliance  1105 . (Alternatively, the monitoring appliance  1105  could intercept all such messages before reception by the email system  1110 , if, for instance, the monitoring appliance is integrated with—and/or serve as—a mail gateway and/or an MTA. In yet other embodiments, the monitoring appliance  1105  may access the mail system  1110  to retrieve bounce messages.) The monitoring appliance  1105  optionally may include a storage medium  1125  (which could comprise RAM, hard disk, one or more databases, etc.), for storing such messages (and/or specified portions of such messages, information about such messages, etc.), for example, to store messages until several have been received, so that messages may be consolidated, summarized, etc. before transmission and/or can be transmitted in batch format. Merely by way of example, if a plurality of bounce messages are received, and all relate to a common mass mailing, it may be more efficient to provide one copy of the original message, along with a summary of information (e.g., intended recipient of each message, summary of differences between messages, etc.) about the collection of bounce messages. The monitoring appliance  1105  may then send the “bounce” messages (and/or summary information) to a phish detection/monitoring system (such as the system  100  depicted in  FIG. 1A ), which may be embodied by the system  200  of  FIG. 2  and/or components thereof, including without limitation a correlation engine, event manager, etc. The messages may be sent individually, in batch format, as one or more consolidated messages, etc. 
     In accordance with some embodiments, the monitoring appliance  1105  may be configured to parse received messages for certain items, including without limitation uniform resource locators (“URL”) contained in the messages, and may transmit only those parsed items to phish detection/monitoring system, instead of the entire message. In yet further embodiments, some aspects of a correlation engine may be incorporated within the monitoring appliance  1105 , such that some (or all) of the analysis of the message occurs at the monitoring appliance  1105 . 
     In particular embodiments, the email system  1110  (and/or the monitoring appliance  1105  and/or fraud detection/prevention system) may maintain a log  1120  of mail system errors, including without limitation a record of “bounce” messages and/or information about the bounce messages (e.g., extracted portions of messages, addressee of original message, etc.). This log  1120  can be searched to determine the errors resulting from “undeliverable” addresses. This information can be used in many ways. Merely by way of example, a feedback loop may be utilized, such that “undeliverable” addresses can be used as bait email addresses for other anti-fraud operations. For instance, if the “bounce” messages (obtained from one or more customers) indicate that a particular addresses and/or domain is used often by scammers, it might be desirable to attempt to register that address and/or domain, thereby ensuring direct receipt of mail addressed to that address. Such addresses can also be used to plant traceable information for “marked money” operations, as described in further detail above. 
       FIG. 11B  illustrates a method  1150  of identifying an illegitimate use of a customer&#39;s online identity (such as for example, in a phishing scam based on email messages appearing to be sent from the customer). The method  1150  may be implemented on a system such as the system  1100  of  FIG. 11A , although it should be appreciated that the method  1150 , like other methods described herein, may be implemented in any suitable fashion and is not limited to a particular structure. The method  1150  can include providing a monitoring appliance (block  1155 ), such as the monitoring appliances described above. Providing the monitoring appliance can include, in some embodiments, situating the monitoring appliance at a customer location and/or, in other embodiments, providing a correlation engine (described above) or similar functionality in the monitoring appliance. (In other embodiments, as noted above, the monitoring appliance may be situated elsewhere, and in fact may be incorporated within a fraud prevention system, as described above, or components of such a system, such as a correlation engine.) Providing the monitoring appliance may also include providing communication between the monitoring appliance and the customer&#39;s email system. 
     At block  1160 , the customer&#39;s email system receives an email message, in the customary fashion. In accordance with some embodiments, the customer&#39;s email system may identify the message as a return message (such as a “bounce” message, as described above) (block  1165 ). At block  1170 , the message may be forwarded to the monitoring appliance (and/or the message may be otherwise accessed by the monitoring appliance). As described above, in some cases, only messages identified as bounce messages are forwarded to the monitoring appliance. In other cases, the customer&#39;s email system may be configured to forward all messages (or a subset of messages, such as all messages from unknown senders, etc.). In yet other embodiments, the monitoring appliance may be configured to access the customer&#39;s email system directly (by accessing a mail store, a particular email account, an email system log, etc.), such that it may not be necessary for the email system to forward messages to the monitoring appliance. Similarly, the email system may be configured to forward relevant entries from a log (such as a firewall log, an email system log, etc.) to the monitoring appliance (block  1175 ), or, alternatively, to forward all log entries (in which case, the monitoring appliance may be configured to parse the log entries for relevant entries). Relevant entries may include any entries that relate to bounce messages, etc. In other embodiments, as noted above, the monitoring appliance may be configured to access such logs directly, such that forwarding log entries may be unnecessary. 
     In some cases, it may be more efficient to extract relevant portions of messages (and, in particular, bounce messages) (block  1180 ), for instance in the manner described above. Relevant portions can include (without limitation) any portions of a message that can be used to identify the original message (to which the bounce message is a response) as a phish message, any portions of a message that can be used to identify the original sender of the message, and/or any portions of a message that can be used to identify the intended recipient of the message (who may in fact be the target of a phishing scam). Merely by way of example, the headers of the message, any URLs contained in the message and/or any relevant text from the body of the message (including, in particular, any relevant portion of the original message reproduced in the body of the bounce message). 
     Likewise, in some cases, it may be desirable to compile a summary message for analysis (block  1185 ). A summary message can comprise any consolidated message that includes the information necessary to analyze a group of messages. The use of a summary message (as opposed to the messages and/or message portions themselves) can, in some case, provide efficiencies in bandwidth used for transmitting messages for analysis, processing cycles and/or time used in analyzing messages, etc. The use of summary messages can be particularly advantageous, for example in cases in which the email system receives a plurality of bounce messages related to a single mass-mailing (which could be indicated by the fact that each of the plurality of bounce messages each indicates that the respective original message has a similar “RETURN PATH:” or “FROM:” header, and/or the fact that the respective body portion of each of the plurality of bounce messages reproduces a similar portion of an original message. Various methods for comparing such a plurality of messages, such as checksumming, hashing, etc. all and/or part of messages and comparing the cnecksums, hashes, etc. may be used. Other techniques for comparing messages may be used as well. 
     In accordance with some embodiments, one or more email messages, portions of messages and/or summary messages (as appropriate) may be transferred to a fraud detection and/or prevention system for analysis (block  1190 ). Similarly, log entries (or summaries of such entries) may be transferred. The transfer can be performed by any suitable method, such as FTP, NFS mount, database transaction (e.g., SQL statement), etc. In some cases, messages, logs and/or log entries (and/or portions or summaries thereof) may be stored local to the monitoring appliance before transfer (in order to, for example, allow for batch transfers on a particular schedule and/or upon receipt of a certain number of messages, etc.). In particular embodiments, storing the messages may comprise storing the messages in a database (perhaps with fields corresponding to various header fields and/or body text, etc.), such that transferring the messages can comprise a database synchronization. Alternatively, the messages may be stored as text files, etc. and/or the transfer to the fraud prevention system for analysis can comprise importing such files into an appropriate import transaction (or series of transactions) for a database at the fraud prevention system. As another example, the fraud prevention system may be configured to perform the methods described above, and/or transferring the messages (or portions, summaries, etc.) can comprise transferring the messages in (and/or converting the messages into) a format suitable for analysis using such methods, as discussed above. For instance, the messages may be transferred to a honeypot, and processing of the messages might therefore proceed as described above. 
     Hence, the method  1150  can further comprise analyzing the message(s), log(s) and/or log entries (block  1194 ). As noted, the analysis of the messages may comprise analysis using methods described above. (Similarly, if analysis of the messages, logs or log entries indicates a likely online fraud, the response strategies and/or methods described above may also be implemented.) Analysis may be performed by the fraud prevention system (if, for example, the messages were transferred to the fraud prevention system) and/or a component thereof, such as a correlation engine. 
     As noted, however, in accordance with other embodiments, the monitoring appliance might comprise a correlation engine, and/or analysis of the messages, etc. (using similar methods) could be performed at the monitoring appliance. In such cases, the results of the analysis could be forwarded to an event manager and/or a dilution engine (or similar component), which might be incorporated within a fraud prevention system and/or might be incorporated within the monitoring appliance, for further action, as appropriate. 
     In particular embodiments, the analysis of the messages, etc. can include identifying the intended recipient of the messages (block  1198 ). This information could be used, for example, to generate new bait email addresses corresponding to the intended recipient. (Additionally, the new bait email address could be planted in various locations, as described above, if desired.) Of course, based on this disclosure, one skilled in the art will appreciate that it might be necessary to obtain a domain name associated with the address and/or to create an account with the provider responsible for that domain name, such that the security provider would receive all mail addressed to that address. This could be beneficial because, by virtue of that address&#39; status as an intended recipient of the phish message, it is apparent that the address already is target for at least one scammer. Presumably, obtaining this recipient email address would not create a conflict with an actual user, because the fact that the phish message was undeliverable indicates that the address is not currently a valid address. 
     In the foregoing description, for the purposes of illustration, various methods were described in a particular order. It should be appreciated that in alternate embodiments, the methods may be performed in an order different than that described. It should also be appreciated that the methods described above may be performed by hardware components and/or may be embodied in sequences of machine-executable instructions, which may be used to cause a machine, such as a general-purpose or special-purpose processor or logic circuits programmed with the instructions, to perform the methods. These machine-executable instructions may be stored on one or more machine readable media, such as CD-ROMs or other type of optical disks, floppy diskettes, ROMs, RAMs, EPROMs, EEPROMs, magnetic or optical cards, flash memory, or other types of machine-readable media suitable for storing electronic instructions. Merely by way of example, some embodiments of the invention provide software programs, which may be executed on one or more computers, for performing the methods described above. In particular embodiments, for example, there may be a plurality of software components configured to execute on various hardware devices. Alternatively, the methods may be performed by a combination of hardware and software. 
     In conclusion, the present invention provides novel solutions for dealing with online fraud. While detailed descriptions of one or more embodiments of the invention have been given above, various alternatives, modifications, and equivalents will be apparent to those skilled in the art without varying from the spirit of the invention. Moreover, except where clearly inappropriate or otherwise expressly noted, it should be assumed that the features, devices and/or components of different embodiments can be substituted and/or combined. Thus, the above description should not be taken as limiting the scope of the invention, which is defined by the appended claims.