Suspicious Service DACL Modification Via Set-Service Cmdlet
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About the rule
Rule Type
Standard
Rule Description
Detects suspicious DACL modifications via the "Set-Service" cmdlet using the "SecurityDescriptorSddl" flag (Only available with PowerShell 7) that can be used to hide services or make them unstopable
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (PROCESSNAME endswith "\pwsh.exe" OR ORIGINALFILENAME = "pwsh.dll") AND COMMANDLINE contains "-SecurityDescriptorSddl ,-sd " AND ((COMMANDLINE contains "Set-Service " AND COMMANDLINE contains "D;;") AND COMMANDLINE contains ";;;IU,;;;SU,;;;BA,;;;SY,;;;WD") select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Nasreddine Bencherchali (Nextron Systems)
