Query: detection rule: Adversaries may establish persistence by executing malicious content triggered by user inactivity. Screensavers are prog
Matching passage: Sigma rule: Adversaries may establish persistence by executing malicious content triggered by user inactivity. Screensavers are prog. Logsource: windows / process_creation. Rule: title: Suspicious ScreenSave Change by Reg.exe id: 0fc35fc3-efe6-4898-8a37-0b233339524f status: test description: 'Adversaries may establish persistence by executing malicious content triggered by user inactivity. Screensavers are programs that execute after a configurable time of user inactivity and consist of Portable Executable (PE) files with a .scr file extension ' references: - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1546.002/T1546.002.md - https://www.welivesecurity.com/wp-content/uploads/2017/08/eset-gazer.pdf author: frack113 date: 2021-08-19 modified: 2022-06-02 tags: - attack.persistence - attack.privilege-escalation - attack.t1546.002 logsource: category: process_creation product: windows detection: selection_reg: Image|endswith: \reg.exe CommandLine|contains: - HKEY_CURRENT_USER\Control Panel\Desktop - HKCU\Control Panel\Desktop selection_option_1: CommandLine|contains|all: - /v ScreenSaveActive - /t REG_SZ - /d 1 - /f selection_option_2: CommandLine|contains|all: - /v ScreenSaveTimeout - /t REG_SZ - '/d ' - /f selection_option_3: CommandLine|contains|all: - /v ScreenSaverIsSecure - /t REG_SZ - /d 0 - /f selection_option_4: CommandLine|contains|all: - /v SCRNSAVE.EXE - /t REG_SZ - '/d ' - .scr - /f condition: selection_reg and 1 of selection_option_* falsepositives: - GPO level: medium
Near-miss passage: Sigma rule: Detects suspicious user agent strings used by exploit / pentest frameworks like Metasploit in proxy logs. Logsource: proxy. Rule: title: Exploit Framework User Agent id: fdd1bfb5-f60b-4a35-910e-f36ed3d0b32f status: test description: Detects suspicious user agent strings used by exploit / pentest frameworks like Metasploit in proxy logs references: - https://blog.didierstevens.com/2015/03/16/quickpost-metasploit-user-agent-strings/ author: Florian Roth (Nextron Systems) date: 2017-07-08 modified: 2025-01-18 tags: - attack.command-and-control - attack.t1071.001 logsource: category: proxy detection: selection: c-useragent: - Internet Explorer * - Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath.2) - Mozilla/4.0 (compatible; Metasploit RSPEC) - Mozilla/4.0 (compatible; MSIE 6.1; Windows NT) - Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1) - Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0) - Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0) - Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Trident/4.0; SIMBAR={7DB0F6DE-8DE7-4841-9084-28FA914B0F2E}; SLCC1; .N - Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) - Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/4.0.221.6 Safari/525.13 - Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; MAAU) - Mozilla/5.0 - Mozilla/4.0 (compatible; SPIPE/1.0 - Mozilla/5.0 (Windows NT 6.3; rv:39.0) Gecko/20100101 Firefox/35.0 - Sametime Community Agent - X-FORWARDED-FOR - DotDotPwn v2.1 - SIPDROID - Mozilla/5.0 (Windows NT 10.0; Win32; x32; rv:60.0) - Mozilla/6.0 (X11; Linux x86_64; rv:24.0) Gecko/20140205 Firefox/27.0 Iceweasel/25.3.0 - '*wordpress hash grabber*' - '*exploit*' - Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36 condition: selection falsepositives: - Unknown level: high