Query: detection rule: Detects the clearing or configuration tampering of EventLog using utilities such as "wevtutil", "powershell" and "wmic".
Matching passage: Sigma rule: Detects the clearing or configuration tampering of EventLog using utilities such as "wevtutil", "powershell" and "wmic".. Logsource: windows / process_creation. Rule: title: Suspicious Eventlog Clearing or Configuration Change Activity id: cc36992a-4671-4f21-a91d-6c2b72a2edf5 status: stable description: 'Detects the clearing or configuration tampering of EventLog using utilities such as "wevtutil", "powershell" and "wmic". This technique were seen used by threat actors and ransomware strains in order to evade defenses. ' references: - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.001/T1070.001.md - https://eqllib.readthedocs.io/en/latest/analytics/5b223758-07d6-4100-9e11-238cfdd0fe97.html - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/wevtutil - https://gist.github.com/fovtran/ac0624983c7722e80a8f5a4babb170ee - https://jdhnet.wordpress.com/2017/12/19/changing-the-location-of-the-windows-event-logs/ - https://www.linkedin.com/posts/huntress-labs_when-a-sketchy-incident-hits-your-network-activity-7304940371078238208-Th_l/?utm_source=share&utm_medium=member_desktop&rcm=ACoAAAJTlRcB28IaUtg03HUU-IdliwzoAL1flGc - https://stackoverflow.com/questions/66011412/how-to-clear-a-event-log-in-powershell-7 - https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventing.reader.eventlogsession.clearlog?view=windowsdesktop-9.0&viewFallbackFrom=dotnet-plat-ext-5.0#System_Diagnostics_Eventing_Reader_EventLogSession_ClearLog_System_String_ - https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventlog.clear author: Ecco, Daniil Yugoslavskiy, oscd.community, D3F7A5105, Swachchhanda Shrawan Poudel (Nextron Systems) date: 2019-09-26 modified: 2026-06-01 tags: - attack.defense-impairment - attack.t1685.005 - attack.t1685.001 - car.2016-04-002 logsource: category: process_creation product: windows detection: selection_wevtutil_img: - Image|endswith: \wevtutil.exe - OriginalFileName: wevtutil.exe selection_wevtutil_cmd: CommandLine|contains: - 'clear-log ' - ' cl ' - 'set-log ' - ' sl ' - 'lfn:' selection_other_ps_img: Image|endswith: - \powershell.exe - \powershell_ise.exe - \pwsh.exe selection_other_ps_cmd: - CommandLine|contains: - 'Clear-EventLog ' - 'Remove-EventLog ' - 'Limit-EventLog ' - 'Clear-WinEvent ' - CommandLine|contains|all: - Eventing.Reader.EventLogSession - ClearLog - CommandLine|contains|all: - Diagnostics.EventLog - Clear selection_other_wmi: Image|endswith: - \powershell.exe - \powershell_ise.exe - \pwsh.exe - \wmic.exe CommandLine|contains: ClearEventLog filter_main_msiexec: ParentImage: - C:\Windows\SysWOW
Near-miss passage: Sigma rule: Detects the use of grep to identify information about the operating system architecture. Often combined beforehand with. Logsource: linux / process_creation. Rule: title: OS Architecture Discovery Via Grep id: d27ab432-2199-483f-a297-03633c05bae6 status: test description: 'Detects the use of grep to identify information about the operating system architecture. Often combined beforehand with the execution of "uname" or "cat /proc/cpuinfo" ' references: - https://blogs.jpcert.or.jp/en/2023/05/gobrat.html - https://jstnk9.github.io/jstnk9/research/GobRAT-Malware/ - https://www.virustotal.com/gui/file/60bcd645450e4c846238cf0e7226dc40c84c96eba99f6b2cffcd0ab4a391c8b3/detection - https://www.virustotal.com/gui/file/3e44c807a25a56f4068b5b8186eee5002eed6f26d665a8b791c472ad154585d1/detection author: Joseliyo Sanchez, @Joseliyo_Jstnk date: 2023-06-02 tags: - attack.discovery - attack.t1082 logsource: category: process_creation product: linux detection: selection_process: Image|endswith: /grep selection_architecture: CommandLine|endswith: - aarch64 - arm - i386 - i686 - mips - x86_64 condition: all of selection_* falsepositives: - Unknown level: low