Suspicious Eventlog Clearing or Configuration Change Activity
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About the rule
Rule Type
Standard
Rule 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.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND ((PROCESSNAME endswith "\wevtutil.exe" OR ORIGINALFILENAME = "wevtutil.exe") AND COMMANDLINE contains "clear-log , cl ,set-log , sl ,lfn:") OR (PROCESSNAME endswith "\powershell.exe,\powershell_ise.exe,\pwsh.exe" AND (COMMANDLINE contains "Clear-EventLog ,Remove-EventLog ,Limit-EventLog ,Clear-WinEvent " OR (COMMANDLINE contains "Eventing.Reader.EventLogSession" AND COMMANDLINE contains "ClearLog") OR (COMMANDLINE contains "Diagnostics.EventLog" AND COMMANDLINE contains "Clear"))) OR ((PROCESSNAME endswith "\powershell.exe,\powershell_ise.exe,\pwsh.exe,\wmic.exe" AND COMMANDLINE contains "ClearEventLog") AND (PARENTPROCESSNAME != "C:\Windows\SysWOW64\msiexec.exe,C:\Windows\System32\msiexec.exe" OR COMMANDLINE notcontains " sl ")) select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Ecco, Daniil Yugoslavskiy, oscd.community, D3F7A5105
