sigmaDRL-1.1from SigmaHQ/sigma

Windows Defender Exclusions Added - PowerShell

Detects modifications to the Windows Defender configuration settings using PowerShell to add exclusions

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FP risk

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ATT&CK techniques

T1562 T1059

Rule sourcerules/windows/powershell/powershell_script/posh_ps_win_defender_exclusions_added.yml

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-evasion
    - attack.t1562
    - 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