Detectionmediumtest

Potential Persistence Via Event Viewer Events.asp

Detects potential registry persistence technique using the Event Viewer "Events.asp" technique

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

Nasreddine Bencherchali (Nextron Systems)Created Fri Feb 17Updated Sun Mar 05a1e11042-a74a-46e6-b07c-c4ce8ecc239bwindows

Log Source

WindowsRegistry Set

ProductWindows← raw: windows

CategoryRegistry Set← raw: registry_set

Detection Logic

detection:
    selection:
        # Covers both "\Policies\" and "\Software\" paths for both "Machine" and "User" level configs
        # Also "MicrosoftRedirectionProgramCommandLineParameters" key
        TargetObject|contains:
            - '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgram'
            - '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionURL'
    filter_default_redirect_program:
        Image|endswith: 'C:\WINDOWS\system32\svchost.exe' # Set via GPO
        TargetObject|endswith: '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgram'
        Details: '%%SystemRoot%%\PCHealth\HelpCtr\Binaries\HelpCtr.exe'
    filter_default_redirect_program_cli:
        Image|endswith: 'C:\WINDOWS\system32\svchost.exe' # Set via GPO
        TargetObject|endswith: '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgramCommandLineParameters'
        Details: '-url hcp://services/centers/support?topic=%%s'
    filter_url:
        Details: 'http://go.microsoft.com/fwlink/events.asp'
    filter_cleaner:
        Details: '(Empty)'
    condition: selection and not 1 of filter_*