Windows Defender Definition Files Removed

Description

Adversaries may disable security tools to avoid possible detection of their tools and activities by removing Windows Defender Definition Files

Query · sigma

selection_img:
- Image|endswith: \MpCmdRun.exe
- OriginalFileName: MpCmdRun.exe
selection_cli:
  CommandLine|contains|all:
  - ' -RemoveDefinitions'
  - ' -All'
condition: all of selection_*

Known false positives

  • Unknown
Raw source Windows Defender Definition Files Removed · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Windows Defender Definition Files Removed
id: 9719a8aa-401c-41af-8108-ced7ec9cd75c
status: test
description: Adversaries may disable security tools to avoid possible detection of their tools and activities by removing Windows Defender Definition Files
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md
    - https://unit42.paloaltonetworks.com/unit42-gorgon-group-slithering-nation-state-cybercrime/
author: frack113
date: 2021-07-07
modified: 2023-07-18
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\MpCmdRun.exe'
        - OriginalFileName: MpCmdRun.exe
    selection_cli:
        CommandLine|contains|all:
            - ' -RemoveDefinitions'
            - ' -All'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high

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