Disabled Windows Defender Eventlog — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2022-07-04 / 2023-08-17.

{
  "category": "registry_set",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 65290f68b485b2e91fb2dff69b36771ae805a57723b28549b0028a91666e856f

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: Disabled Windows Defender Eventlog
id: fcddca7c-b9c0-4ddf-98da-e1e2d18b0157
status: test
description: Detects the disabling of the Windows Defender eventlog as seen in relation to Lockbit 3.0 infections
references:
    - https://twitter.com/WhichbufferArda/status/1543900539280293889/photo/2
author: Florian Roth (Nextron Systems)
date: 2022-07-04
modified: 2023-08-17
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains: '\Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-Windows Defender/Operational\Enabled'
        Details: 'DWORD (0x00000000)'
    condition: selection
falsepositives:
    - Other Antivirus software installations could cause Windows to disable that eventlog (unknown)
level: high

Original YAML and metadata in JSON

False positives

• Other Antivirus software installations could cause Windows to disable that eventlog (unknown)

Source references

• https://twitter.com/WhichbufferArda/status/1543900539280293889/photo/2