Important Windows Eventlog Cleared — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems), Tim Shelton, Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2022-05-17 / 2023-11-15.

{
  "product": "windows",
  "service": "system"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 7815bfc6de0e8ea2eca76722b02177955737f865a3f477890e298163df2bc30c

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Important Windows Eventlog Cleared
id: 100ef69e-3327-481c-8e5c-6d80d9507556
related:
    - id: a62b37e0-45d3-48d9-a517-90c1a1b0186b
      type: derived
status: test
description: Detects the clearing of one of the Windows Core Eventlogs. e.g. caused by "wevtutil cl" command execution
references:
    - https://twitter.com/deviouspolack/status/832535435960209408
    - https://www.hybrid-analysis.com/sample/027cc450ef5f8c5f653329641ec1fed91f694e0d229928963b30f6b0d7d3a745?environmentId=100
author: Florian Roth (Nextron Systems), Tim Shelton, Nasreddine Bencherchali (Nextron Systems)
date: 2022-05-17
modified: 2023-11-15
tags:
    - attack.defense-impairment
    - attack.t1685.005
    - car.2016-04-002
logsource:
    product: windows
    service: system
detection:
    selection:
        EventID: 104
        Provider_Name: 'Microsoft-Windows-Eventlog'
        Channel:
            - 'Microsoft-Windows-PowerShell/Operational'
            - 'Microsoft-Windows-Sysmon/Operational'
            - 'PowerShellCore/Operational'
            - 'Security'
            - 'System'
            - 'Windows PowerShell'
    condition: selection
falsepositives:
    - Rollout of log collection agents (the setup routine often includes a reset of the local Eventlog)
    - System provisioning (system reset before the golden image creation)
level: high

Original YAML and metadata in JSON

False positives

• Rollout of log collection agents (the setup routine often includes a reset of the local Eventlog)
• System provisioning (system reset before the golden image creation)

Source references

• https://twitter.com/deviouspolack/status/832535435960209408
• https://www.hybrid-analysis.com/sample/027cc450ef5f8c5f653329641ec1fed91f694e0d229928963b30f6b0d7d3a745?environmentId=100