Detectionhightest

Potential Persistence Via Powershell Search Order Hijacking - Task

Detects suspicious powershell execution via a schedule task where the command ends with an suspicious flags to hide the powershell instance instead of executeing scripts or commands. This could be a sign of persistence via PowerShell "Get-Variable" technique as seen being used in Colibri Loader

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Launch

Martin Mueller, Florian Roth (Nextron Systems)Created Fri Apr 08Updated Fri Feb 03b66474aa-bd92-4333-a16c-298155b120dfwindows

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:
        ParentImage: 'C:\WINDOWS\System32\svchost.exe'
        ParentCommandLine|contains|all:
            - '-k netsvcs'
            - '-s Schedule'
        CommandLine|endswith:
            - ' -windowstyle hidden'
            - ' -w hidden'
            - ' -ep bypass'
            - ' -noni'
    condition: selection