Detectionhightest

Invoke-Obfuscation STDIN+ Launcher - System

Detects Obfuscated use of stdin to execute PowerShell

Convert In Phoenix Studio

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

Launch

Jonathan Cheong, oscd.communityCreated Thu Oct 15Updated Tue Nov 2972862bf2-0eb1-11eb-adc1-0242ac120002windows

Log Source

Windowssystem

ProductWindows← raw: windows

Servicesystem← raw: system

Detection Logic

detection:
    selection_main:
        Provider_Name: 'Service Control Manager'
        EventID: 7045
        # ImagePath|re: 'cmd.{0,5}(?:\/c|\/r).+powershell.+(?:\$\{?input\}?|noexit).+\"'
        # 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( $InpUt )"
        ImagePath|contains|all:
            - 'cmd'
            - 'powershell'
        ImagePath|contains:
            - '/c'
            - '/r'
    selection_other:
        - ImagePath|contains: 'noexit'
        - ImagePath|contains|all:
              - 'input'
              - '$'
    condition: all of selection_*