Research and Analysis of User Behavior Fingerprint on Security Situational Awareness Based on DNS Log Before accessing Internet websites or applications, network users first ask the Domain Name System (DNS) for the corresponding IP address, and then the useru0027s browser or application accesses the required resources through the IP address. The server log of DNS keeps records of all usersu0027 requesting queries. This paper analyzes the user network accessing behavior by analyzing network DNS log in campus, constructing a behavior fingerprint model for each user. Different users and even same useru0027s fingerprints in different periods can be used to determine whether the useru0027s access is abnormal or safe, whether it is infected with malicious code. After detecting the behavior of abnormal user accessing, preventing the spread of viruses, Trojans, bots and attacks is made possible, which further assists the protection of usersu0027 network access security through corresponding techniques. Finally, analysis of user behavior fingerprints of campus network access is conducted.

Discovering Suspicious APT Behaviors by Analyzing DNS Activities As sensors become more prevalent in our lives, security issues have become a major concern. In the Advanced Persistent Threat (APT) attack, the sensor has also become an important role as a transmission medium. As a relatively weak link in the network transmission process, sensor networks often become the target of attackers. Due to the characteristics of low traffic, long attack time, diverse attack methods, and realtime evolution, existing detection methods have not been able to detect them comprehensively. Current research suggests that a suspicious domain name can be obtained by analyzing the domain name resolution (DNS) request to the target network in an APT attack. In past work based on DNS log analyses, most of the work would simply calculate the characteristics of the request message or the characteristics of the response message or the feature set of the request message plus the response message, and the relationship between the response message and the request message was not considered. This may leave out the detection of some APT attacks in which the DNS resolution process is incomplete. This paper proposes a new feature that represents the relationship between a DNS request and the response message, based on a deep learning method used to analyze the DNS request records. The algorithm performs threat assessment on the DNS behavior to be detected based on the calculated suspicious value. This paper uses the data of 4, 907, 147, 146 DNS request records (376, 605, 606 records after DNS Data Preprocessing) collected in a large campus network and uses simulation attack data to verify the validity and correctness of the system. The results of the experiments show that our method achieves an average accuracy of 97.6% in detecting suspicious DNS behavior, with the orange false positive (FP) at 2.3% and the recall at 96.8%. The proposed system can effectively detect the hidden and suspicious DNS behavior in APT.