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Potentially Suspicious Call To Win32_NTEventlogFile Class

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

Detection Query

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

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2023-07-13

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasion
Raw Content
title: Potentially Suspicious Call To Win32_NTEventlogFile Class
id: caf201a9-c2ce-4a26-9c3a-2b9525413711
related:
    - id: e2812b49-bae0-4b21-b366-7c142eafcde2
      type: similar
status: test
description: Detects usage of the WMI class "Win32_NTEventlogFile" in a potentially suspicious way (delete, backup, change permissions, etc.) from a PowerShell script
references:
    - https://learn.microsoft.com/en-us/previous-versions/windows/desktop/legacy/aa394225(v=vs.85)
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-07-13
tags:
    - attack.defense-evasion
logsource:
    category: process_creation
    product: windows
detection:
    selection_class:
        CommandLine|contains: 'Win32_NTEventlogFile'
    selection_function:
        CommandLine|contains:
            - '.BackupEventlog('
            - '.ChangeSecurityPermissions('
            - '.ChangeSecurityPermissionsEx('
            - '.ClearEventLog('
            - '.Delete('
            - '.DeleteEx('
            - '.Rename('
            - '.TakeOwnerShip('
            - '.TakeOwnerShipEx('
    condition: all of selection_*
falsepositives:
    - Unknown
level: high