Suspicious Workstation Locking via Rundll32
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About the rule
Rule Type
Standard
Rule Description
Detects a suspicious call to the user32.dll function that locks the user workstation
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (PROCESSNAME endswith "\rundll32.exe" OR ORIGINALFILENAME = "RUNDLL32.EXE") AND PARENTPROCESSNAME endswith "\cmd.exe" AND COMMANDLINE contains "user32.dll," AND COMMANDLINE contains "LockWorkStation" select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
frack113
