Sigma rule: Removal Of AMSI Provider Registry Keys

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-cee0da0d7971, updated 2025-10-07T00:00:00.000Z.

Rule

Title: Removal Of AMSI Provider Registry Keys
Status: test
Level: high
Author: frack113
Date: 2021-06-07
Modified: 2025-10-07
File: rules/windows/registry/registry_delete/registry_delete_removal_amsi_registry_key.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the deletion of AMSI provider registry key entries in HKLM\Software\Microsoft\AMSI. This technique could be used by an attacker in order to disable AMSI inspection.

Log source

product: windows
category: registry_delete

Detection

selection:
    TargetObject|endswith:
        - '{2781761E-28E0-4109-99FE-B9D127C57AFE}' # IOfficeAntiVirus
        - '{A7C452EF-8E9F-42EB-9F2B-245613CA0DC9}' # ProtectionManagement.dll
filter_main_defender:
    Image|startswith:
        - 'C:\ProgramData\Microsoft\Windows Defender\Platform\'
        - 'C:\Program Files\Windows Defender\'
        - 'C:\Program Files (x86)\Windows Defender\'
    Image|endswith: '\MsMpEng.exe'
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

Unlikely

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/registry/registry_delete/registry_delete_removal_amsi_registry_key.yml

Sources and licences

SigmaHQ
"Removal Of AMSI Provider Registry Keys" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_delete/registry_delete_removal_amsi_registry_key.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: Removal Of AMSI Provider Registry Keys",
entity page, dataset version ref-cee0da0d7971, updated 2025-10-07T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/41d1058a-aea7-4952-9293-29eaaf516465 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 41d1058a-aea7-4952-9293-29eaaf516465, 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.