Potentially Suspicious Call To Win32_NTEventlogFile Class - PSScript

calendar Jul 24, 2023 · attack.defense_evasion  ·
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Detects usage of the WMI class "Win32_NTEventlogFile" in a potentially suspicious way (delete, backup, change permissions, etc.) from a PowerShell script

Sigma rule (View on GitHub)

 1title: Potentially Suspicious Call To Win32_NTEventlogFile Class - PSScript
 2id: e2812b49-bae0-4b21-b366-7c142eafcde2
 3status: experimental
 4description: Detects usage of the WMI class "Win32_NTEventlogFile" in a potentially suspicious way (delete, backup, change permissions, etc.) from a PowerShell script
 5references:
 6    - https://learn.microsoft.com/en-us/previous-versions/windows/desktop/legacy/aa394225(v=vs.85)
 7author: Nasreddine Bencherchali (Nextron Systems)
 8date: 2023/07/13
 9tags:
10    - attack.defense_evasion
11logsource:
12    category: ps_script
13    product: windows
14    definition: bade5735-5ab0-4aa7-a642-a11be0e40872
15detection:
16    selection_class:
17        ScriptBlockText|contains: 'Win32_NTEventlogFile'
18    selection_function:
19        ScriptBlockText|contains:
20            - '.BackupEventlog('
21            - '.ChangeSecurityPermissions('
22            - '.ChangeSecurityPermissionsEx('
23            - '.ClearEventLog('
24            - '.Delete('
25            - '.DeleteEx('
26            - '.Rename('
27            - '.TakeOwnerShip('
28            - '.TakeOwnerShipEx('
29    condition: all of selection_*
30falsepositives:
31    - Legitimate administration and backup scripts
32level: medium

References

  • Win32_NTEventlogFile class (Windows)

    Win32_NTEventlogFile class Article 08/31/2015 The Win32_NTEventlogFile WMI class represents a logical file or directory of operating system events. The file is also known as the event log. The foll...


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