Detectionmediumtest

Potentially Suspicious Call To Win32_NTEventlogFile Class - PSScript

Detects usage of the WMI class "Win32_NTEventlogFile" in a potentially suspicious way (delete, backup, change permissions, etc.) from a PowerShell script

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

Launch

Nasreddine Bencherchali (Nextron Systems)Created Thu Jul 13e2812b49-bae0-4b21-b366-7c142eafcde2windows

Log Source

WindowsPowerShell Script

ProductWindows← raw: windows

CategoryPowerShell Script← raw: ps_script

Definition

bade5735-5ab0-4aa7-a642-a11be0e40872

Detection Logic

detection:
    selection_class:
        ScriptBlockText|contains: 'Win32_NTEventlogFile'
    selection_function:
        ScriptBlockText|contains:
            - '.BackupEventlog('
            - '.ChangeSecurityPermissions('
            - '.ChangeSecurityPermissionsEx('
            - '.ClearEventLog('
            - '.Delete('
            - '.DeleteEx('
            - '.Rename('
            - '.TakeOwnerShip('
            - '.TakeOwnerShipEx('
    condition: all of selection_*