Disable Tamper Protection on Windows Defender — Sigma Rule

Rule metadata and linked tags

Author: Austin Songer @austinsonger. Source status: test; severity: medium. Source dates: 2021-08-04 / 2023-08-17.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 22226c9a32c546cf95d6b23665f055d37f0369c9142694cd7666371098edf4bd

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: Disable Tamper Protection on Windows Defender
id: 93d298a1-d28f-47f1-a468-d971e7796679
status: test
description: Detects disabling Windows Defender Tamper Protection
references:
    - https://www.tenforums.com/tutorials/123792-turn-off-tamper-protection-microsoft-defender-antivirus.html
author: Austin Songer @austinsonger
date: 2021-08-04
modified: 2023-08-17
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains: '\Microsoft\Windows Defender\Features\TamperProtection'
        Details: DWORD (0x00000000)
    filter_msmpeng_client: # only disabled temporarily during updates
        Image|startswith: 'C:\ProgramData\Microsoft\Windows Defender\Platform\'
        Image|endswith: '\MsMpEng.exe'
    filter_msmpeng_domain_controller: # only disabled temporarily during updates
        Image: 'C:\Program Files\Windows Defender\MsMpEng.exe'
    condition: selection and not 1 of filter_*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://www.tenforums.com/tutorials/123792-turn-off-tamper-protection-microsoft-defender-antivirus.html