Detectionhightest

Invoke-Obfuscation STDIN+ Launcher

Detects Obfuscated use of stdin to execute PowerShell

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Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

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Jonathan Cheong, oscd.communityCreated Thu Oct 15Updated Mon Apr 156c96fc76-0eb1-11eb-adc1-0242ac120002windows

Log Source

WindowsProcess Creation

ProductWindows← raw: windows

CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic

detection:
    selection:
        # Example 1: c:\windows\sYstEm32\CmD.eXE /C"echO\Invoke-Expression (New-Object Net.WebClient).DownloadString | POwersHELl -NoEXiT -"
        # Example 2: c:\WiNDOws\sysTEm32\cmd.EXe /C " ECHo Invoke-Expression (New-Object Net.WebClient).DownloadString | POwersHELl -nol ${EXEcUtIONCONTeXT}.INvOkEComMANd.InvOKEScRIPt( $InpUt )"
        CommandLine|re: 'cmd.{0,5}(?:/c|/r).+powershell.+(?:\$\{?input\}?|noexit).+\"'
    condition: selection