Query: rule covering Detects suspicious user agent strings used by malware in proxy logs
Matching passage: Sigma rule: Detects suspicious user agent strings used by malware in proxy logs. Logsource: proxy. Rule: title: Malware User Agent id: 5c84856b-55a5-45f1-826f-13f37250cf4e status: test description: Detects suspicious user agent strings used by malware in proxy logs references: - http://rules.emergingthreats.net/open/snort-2.9.0/rules/emerging-user_agents.rules - http://www.botopedia.org/search?searchword=scan&searchphrase=all - https://networkraptor.blogspot.com/2015/01/user-agent-strings.html - https://perishablepress.com/blacklist/ua-2013.txt - https://www.bluecoat.com/en-gb/security-blog/2015-05-05/know-your-agents - https://twitter.com/kladblokje_88/status/1614673320124743681?s=12&t=joEpeVa5d58aHYNGA_To7Q - https://pbs.twimg.com/media/FtYbfsDXoAQ1Y8M?format=jpg&name=large - https://twitter.com/crep1x/status/1635034100213112833 author: Florian Roth (Nextron Systems), X__Junior (Nextron Systems), Nasreddine Bencherchali (Nextron Systems) date: 2017-07-08 modified: 2024-04-14 tags: - attack.command-and-control - attack.t1071.001 logsource: category: proxy detection: selection: c-useragent: - Mozilla/5.0 (Windows NT 6.1; WOW64; rv:53.0) Gecko/20100101 Chrome /53.0 - Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1) - Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0) - Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.1.4322) - HttpBrowser/1.0 - '*<|>*' - nsis_inetc (mozilla) - Wget/1.9+cvs-stable (Red Hat modified) - Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; .NET CLR 1.1.4322) - '*zeroup*' - Mozilla/5.0 (Windows NT 5.1 ; v.* - '* adlib/*' - '* tiny' - '* BGroom *' - '* changhuatong' - '* CholTBAgent' - Mozilla/5.0 WinInet - RookIE/1.0 - M - Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0) - Mozilla/4.0 (compatible;MSIE 7.0;Windows NT 6.0) - backdoorbot - Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.1 (.NET CLR 3.5.30731) - Opera/8.81 (Windows NT 6.0; U; en) - Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.1 (.NET CLR 3.5.30729) - Opera - Mozilla/4.0 (compatible; MSIE 5.0; Windows 98) - Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0) - MSIE - '*(Charon; Inferno)' - Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/5.0) - Mozilla/4.0 (compatible; MSIE 6.1; Windows NT) - Mozilla/4.0(compatible; MSIE 6.0; Windows NT 5.1) - Mozilla/5.0 (Windows NT 10.0; Win64; x64) - Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 10.0; Win64; x64) - Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Win64; x64) - Mozilla/4.0
Near-miss passage: Sigma rule: Detects usage of the "cipher" built-in utility in order to overwrite deleted data from disk. Adversaries may destroy dat. Logsource: windows / process_creation. Rule: title: Deleted Data Overwritten Via Cipher.EXE id: 4b046706-5789-4673-b111-66f25fe99534 status: test description: 'Detects usage of the "cipher" built-in utility in order to overwrite deleted data from disk. Adversaries may destroy data and files on specific systems or in large numbers on a network to interrupt availability to systems, services, and network resources. Data destruction is likely to render stored data irrecoverable by forensic techniques through overwriting files or data on local and remote drives ' references: - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1485/T1485.md#atomic-test-3---overwrite-deleted-data-on-c-drive author: frack113 date: 2021-12-26 modified: 2023-02-21 tags: - attack.impact - attack.t1485 logsource: category: process_creation product: windows detection: selection_img: - OriginalFileName: CIPHER.EXE - Image|endswith: \cipher.exe selection_cli: CommandLine|contains: ' /w:' condition: all of selection_* falsepositives: - Unknown level: medium regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_cipher_overwrite_deleted_data/info.yml simulation: - type: atomic-red-team name: Overwrite deleted data on C drive technique: T1485 atomic_guid: 321fd25e-0007-417f-adec-33232252be19