Windows Defender Exclusions Added - PowerShell — Sigma Rule

Rule metadata and linked tags

Author: Tim Rauch, Elastic (idea). Source status: test; severity: medium. Source dates: 2022-09-16 / 2022-11-26.

{
  "category": "ps_script",
  "product": "windows",
  "definition": "Requirements: Script Block Logging must be enabled"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 09201109f75762aa798a91cecf91270de0a16d3cc5afe73ff9da12ff3e999f38

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 Exclusions Added - PowerShell
id: c1344fa2-323b-4d2e-9176-84b4d4821c88
related:
    - id: 17769c90-230e-488b-a463-e05c08e9d48f
      type: similar
status: test
description: Detects modifications to the Windows Defender configuration settings using PowerShell to add exclusions
references:
    - https://www.elastic.co/guide/en/security/current/windows-defender-exclusions-added-via-powershell.html
author: Tim Rauch, Elastic (idea)
date: 2022-09-16
modified: 2022-11-26
tags:
    - attack.defense-impairment
    - attack.t1685
    - attack.execution
    - attack.t1059
logsource:
    category: ps_script
    product: windows
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_args_exc:
        ScriptBlockText|contains:
            - ' -ExclusionPath '
            - ' -ExclusionExtension '
            - ' -ExclusionProcess '
            - ' -ExclusionIpAddress '
    selection_args_pref:
        ScriptBlockText|contains:
            - 'Add-MpPreference '
            - 'Set-MpPreference '
    condition: all of selection*
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://www.elastic.co/guide/en/security/current/windows-defender-exclusions-added-via-powershell.html