
title: Remove Windows Defender Definition Files
author: frack113
date: 2021/07/07
description: Adversaries may disable security tools to avoid possible detection of
  their tools and activities by removing Windows Defender Definition Files
detection:
  SELECTION_1:
    EventID: 1
  SELECTION_2:
    OriginalFileName: MpCmdRun.exe
  SELECTION_3:
    CommandLine: '* -RemoveDefinitions*'
  SELECTION_4:
    CommandLine: '* -All*'
  condition: (SELECTION_1 and SELECTION_2 and SELECTION_3 and SELECTION_4)
falsepositives:
- Unknown
fields:
- ComputerName
- User
- CommandLine
- ParentCommandLine
id: 9719a8aa-401c-41af-8108-ced7ec9cd75c
level: medium
logsource:
  category: process_creation
  product: windows
references:
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1562.001/T1562.001.md
- https://unit42.paloaltonetworks.com/unit42-gorgon-group-slithering-nation-state-cybercrime/
status: experimental
tags:
- attack.defense_evasion
- attack.t1562.001
ruletype: SIGMA
