Cscript/Wscript Potentially Suspicious Child Process
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About the rule
Rule Type
Standard
Rule Description
Detects potentially suspicious child processes of Wscript/Cscript. These include processes such as rundll32 with uncommon exports or PowerShell spawning rundll32 or regsvr32. Malware such as Pikabot and Qakbot were seen using similar techniques as well as many others.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND PARENTPROCESSNAME endswith "\wscript.exe,\cscript.exe" AND (PROCESSNAME endswith "\rundll32.exe" OR (PROCESSNAME endswith "\cmd.exe,\powershell.exe,\pwsh.exe" AND ((COMMANDLINE contains "mshta" AND COMMANDLINE contains "http") OR COMMANDLINE contains "rundll32,regsvr32,msiexec"))) AND (PROCESSNAME notendswith "\rundll32.exe" OR COMMANDLINE notcontains "UpdatePerUserSystemParameters,PrintUIEntry,ClearMyTracksByProcess") 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), Alejandro Houspanossian ('@lekz86')
