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MediumSigmaHQ Nasreddine Bencherchali (Nextron Systems) +1

Suspicious Eventlog Clear

Detects usage of known powershell cmdlets such as "Clear-EventLog" to clear the Windows event logs

Detection logic

Detection requirements

Platform: Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source product: windows
Log source category: ps_script

Known benign triggers

Rare need to clear logs before doing something. Sometimes used by installers or cleaner scripts. The script should be investigated to determine if it's legitimate

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
eqllib.readthedocs.io/en/latest/analytics/5b223758-07d6-4100-9e11-238cfdd0fe97.html	Unclassified	2
github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.001/T1070.001.md	Detection test	2
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_	Product documentation	2
learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventlog.clear	Product documentation	2
stackoverflow.com/questions/66011412/how-to-clear-a-event-log-in-powershell-7	Unclassified	2
twitter.com/oroneequalsone/status/1568432028361830402	Social post	Only this detection cites it

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