Windows Defender Grace Period Expired — Sigma Rule

Rule metadata and linked tags

Author: Ján Trenčanský, frack113. Source status: stable; severity: high. Source dates: 2020-07-28 / 2023-11-22.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 81d1b3924a411a32cc3c593952ee894ab9ff3e9aef189e0657ef4287f8319f0d

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: Windows Defender Grace Period Expired
id: 360a1340-398a-46b6-8d06-99b905dc69d2
related:
    - id: fe34868f-6e0e-4882-81f6-c43aa8f15b62
      type: obsolete
status: stable
description: |
    Detects the expiration of the grace period of Windows Defender. This means protection against viruses, spyware, and other potentially unwanted software is disabled.
references:
    - https://learn.microsoft.com/en-us/defender-endpoint/troubleshoot-microsoft-defender-antivirus?view=o365-worldwide#event-id-5101
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md
    - https://craigclouditpro.wordpress.com/2020/03/04/hunting-malicious-windows-defender-activity/
author: Ján Trenčanský, frack113
date: 2020-07-28
modified: 2023-11-22
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    product: windows
    service: windefend
detection:
    selection:
        EventID: 5101 # The antimalware platform is expired.
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://learn.microsoft.com/en-us/defender-endpoint/troubleshoot-microsoft-defender-antivirus?view=o365-worldwide#event-id-5101
• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md
• https://craigclouditpro.wordpress.com/2020/03/04/hunting-malicious-windows-defender-activity/