Eventlog Cleared — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: medium. Source dates: 2017-01-10 / 2023-11-15.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 24ff21426b048e88368570356729a3ec7c2d62b71d116bfcbc0721c1191909e9

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: Eventlog Cleared
id: a62b37e0-45d3-48d9-a517-90c1a1b0186b
related:
    - id: f2f01843-e7b8-4f95-a35a-d23584476423
      type: obsolete
    - id: d99b79d2-0a6f-4f46-ad8b-260b6e17f982
      type: derived
    - id: 100ef69e-3327-481c-8e5c-6d80d9507556
      type: derived
status: test
description: One of the Windows Eventlogs has been cleared. 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)
date: 2017-01-10
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'
    filter_main_covered:
        # The channels below are already covered by the rule 100ef69e-3327-481c-8e5c-6d80d9507556
        Channel:
            - 'Microsoft-Windows-PowerShell/Operational'
            - 'Microsoft-Windows-Sysmon/Operational'
            - 'PowerShellCore/Operational'
            - 'Security'
            - 'System'
            - 'Windows PowerShell'
    condition: selection and not 1 of filter_main_*
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: medium

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