CobaltStrike Load by Rundll32

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About the rule

Rule Type

Standard

Rule Description

Rundll32 can be use by Cobalt Strike with StartW function to load DLLs from the command line.

Severity

Trouble

Rule Requirement

Criteria

Action1: actionname = "Process started" AND (PROCESSNAME endswith "\rundll32.exe" OR ORIGINALFILENAME = "RUNDLL32.EXE" OR COMMANDLINE contains "rundll32.exe,rundll32 ") AND (COMMANDLINE contains ".dll" AND COMMANDLINE endswith " StartW,,StartW") select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME

Detection

Execution Mode

realtime

Log Sources

Windows

Author

Wojciech Lesicki