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PowerShell Write-EventLog Usage

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

Detection Query

selection:
  ScriptBlockText|contains|all:
    - Write-EventLog
    - "-RawData "
condition: selection

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2022-08-16

Data Sources

windowsps_script

Platforms

windows

References

https://www.blackhillsinfosec.com/windows-event-logs-for-red-teams/

Tags

attack.defense-evasion

Raw Content

title: PowerShell Write-EventLog Usage
id: 35f41cd7-c98e-469f-8a02-ec4ba0cc7a7e
status: test
description: 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
references:
    - https://www.blackhillsinfosec.com/windows-event-logs-for-red-teams/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-16
tags:
    - attack.defense-evasion
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains|all:
            - 'Write-EventLog'
            - '-RawData '
    condition: selection
falsepositives:
    - Legitimate applications writing events via this cmdlet. Investigate alerts to determine if the action is benign
level: medium