Detection rules › Sigma
Windows Defender Definition Files Removed
Adversaries may disable security tools to avoid possible detection of their tools and activities by removing Windows Defender Definition Files
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Defense Impairment |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 1: Process creation |
Rule body
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
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_img
selection_img:
- Image|endswith: '\MpCmdRun.exe'
- OriginalFileName: MpCmdRun.exe
Stage 2: selection_cli
selection_cli:
CommandLine|contains|all:
- ' -RemoveDefinitions'
- ' -All'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
CommandLine | match |
| field:"CommandLine" kind:match |
Image | ends_with |
| field:"Image" kind:ends_with value:"\MpCmdRun.exe" |
OriginalFileName | eq |
| field:"OriginalFileName" kind:eq value:"MpCmdRun.exe" |