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Windows Defender Exclusions Added - PowerShell

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

MITRE ATT&CK

defense-evasionexecution

Detection Query

selection_args_exc:
  ScriptBlockText|contains:
    - " -ExclusionPath "
    - " -ExclusionExtension "
    - " -ExclusionProcess "
    - " -ExclusionIpAddress "
selection_args_pref:
  ScriptBlockText|contains:
    - "Add-MpPreference "
    - "Set-MpPreference "
condition: all of selection*

Author

Tim Rauch, Elastic (idea)

Created

2022-09-16

Data Sources

windowsps_script

Platforms

windows

References

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

Tags

attack.defense-evasionattack.t1562attack.executionattack.t1059

Raw Content

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