COLDSTEEL RAT Cleanup Command Execution
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About the rule
Rule Type
Standard
Rule Description
Detects the creation of a "rundll32" process from the ColdSteel persistence service to initiate the cleanup command by calling one of its own exports. This functionality is not present in "MileStone2017" and some "MileStone2016" samples
Severity
Critical
Rule Requirement
Criteria
Action1: actionname = "Process started" AND PARENTPROCESSNAME endswith "\svchost.exe" AND PARENTPROCESSCOMMANDLINE contains " -k msupdate, -k msupdate2, -k alg" AND PROCESSNAME endswith "\rundll32.exe" AND COMMANDLINE contains "UpdateDriverForPlugAndPlayDevicesW,ServiceMain,DiUninstallDevice" 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)
