sigmahighHunting

Suspicious Uninstall of Windows Defender Feature via PowerShell

Detects the use of PowerShell with Uninstall-WindowsFeature or Remove-WindowsFeature cmdlets to disable or remove the Windows Defender GUI feature, a common technique used by adversaries to evade defenses.

MITRE ATT&CK

T1562.001

defense-evasion

Detection Query

selection_img:
  - Image|endswith:
      - \powershell_ise.exe
      - \powershell.exe
      - \pwsh.exe
  - OriginalFileName:
      - PowerShell_ISE.EXE
      - PowerShell.EXE
      - pwsh.dll
selection_cli_uninstall:
  CommandLine|contains:
    - Uninstall-WindowsFeature
    - Remove-WindowsFeature
selection_cli_defender_feature:
  CommandLine|contains: Windows-Defender
condition: all of selection_*

Author

yxinmiracle

Created

2025-08-22

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasionattack.t1562.001

Raw Content

title: Suspicious Uninstall of Windows Defender Feature via PowerShell
id: c443012c-7928-43bf-ac20-7eda5efe61ad
status: experimental
description: |
    Detects the use of PowerShell with Uninstall-WindowsFeature or Remove-WindowsFeature cmdlets to disable or remove the Windows Defender GUI feature, a common technique used by adversaries to evade defenses.
references:
    - https://learn.microsoft.com/en-us/powershell/module/microsoft.windows.servermanager.migration/uninstall-windowsfeature
    - https://thedfirreport.com/2023/04/03/malicious-iso-file-leads-to-domain-wide-ransomware
author: yxinmiracle
date: 2025-08-22
tags:
    - attack.defense-evasion
    - attack.t1562.001
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith:
              - '\powershell_ise.exe'
              - '\powershell.exe'
              - '\pwsh.exe'
        - OriginalFileName:
              - 'PowerShell_ISE.EXE'
              - 'PowerShell.EXE'
              - 'pwsh.dll'
    selection_cli_uninstall:
        CommandLine|contains:
            - 'Uninstall-WindowsFeature'
            - 'Remove-WindowsFeature' # Only supported in Windows Server 2008 R2 and Windows 2012 R2
    selection_cli_defender_feature:
        CommandLine|contains: 'Windows-Defender'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high