PowerShell Write-EventLog Usage

calendar Aug 12, 2024 · attack.defense-evasion  ·
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Detects usage of the "Write-EventLog" cmdlet with 'RawData' flag. The cmdlet can be levreage to write malicious payloads to the EventLog and then retrieve them later for later use

Sigma rule (View on GitHub)

 1title: PowerShell Write-EventLog Usage
 2id: 35f41cd7-c98e-469f-8a02-ec4ba0cc7a7e
 3status: test
 4description: Detects usage of the "Write-EventLog" cmdlet with 'RawData' flag. The cmdlet can be levreage to write malicious payloads to the EventLog and then retrieve them later for later use
 5references:
 6    - https://www.blackhillsinfosec.com/windows-event-logs-for-red-teams/
 7author: Nasreddine Bencherchali (Nextron Systems)
 8date: 2022-08-16
 9tags:
10    - attack.defense-evasion
11logsource:
12    product: windows
13    category: ps_script
14    definition: 'Requirements: Script Block Logging must be enabled'
15detection:
16    selection:
17        ScriptBlockText|contains|all:
18            - 'Write-EventLog'
19            - '-RawData '
20    condition: selection
21falsepositives:
22    - Legitimate applications writing events via this cmdlet. Investigate alerts to determine if the action is benign
23level: medium

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