Sigma rule: Windows Defender Definition Files Removed

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-9a3350a8ae4f, updated 2023-07-18T00:00:00.000Z.

Rule

Title: Windows Defender Definition Files Removed
Status: test
Level: high
Author: frack113
Date: 2021-07-07
Modified: 2023-07-18
File: rules/windows/process_creation/proc_creation_win_mpcmdrun_remove_windows_defender_definition.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

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

Log source

product: windows
category: process_creation

Detection

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

False positives (as the rule lists them)

Unknown

MITRE ATT&CK ids this rule names

T1685

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_mpcmdrun_remove_windows_defender_definition.yml

Sources and licences

SigmaHQ
"Windows Defender Definition Files Removed" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_mpcmdrun_remove_windows_defender_definition.yml.
Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License
Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Windows Defender Definition Files Removed",
entity page, dataset version ref-9a3350a8ae4f, updated 2023-07-18T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/9719a8aa-401c-41af-8108-ced7ec9cd75c (accessed 2026-11-03).
Underlying source: SigmaHQ rule 9719a8aa-401c-41af-8108-ced7ec9cd75c, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.