Detection rules › Sigma
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
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Defense Impairment | No specific technique |
Event coverage
| Provider | Event | Title |
|---|---|---|
| PowerShell | Event ID 4104 | Creating Scriptblock text (MessageNumber of MessageTotal). |
Rule body yaml
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-impairment
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
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
ScriptBlockText|contains|all:
- 'Write-EventLog'
- '-RawData '
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
ScriptBlockText | match |
|