Sigma rule: Outlook Security Settings Updated - Registry

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-06efa2082f30, updated 2026-01-09T00:00:00.000Z.

Rule

Title
Outlook Security Settings Updated - Registry
Status
test
Level
medium
Author
frack113
Date
2021-12-28
Modified
2026-01-09
File
rules/windows/registry/registry_set/registry_set_office_outlook_security_settings.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects changes to the registry values related to outlook security settings

Log source

product
windows
category
registry_set

Detection

selection:
    TargetObject|contains|all:
        - '\SOFTWARE\Microsoft\Office\'
        - '\Outlook\Security\'
filter_main_outlook:
    Image|startswith:
        - 'C:\Program Files\Microsoft Office\'
        - 'C:\Program Files (x86)\Microsoft Office\'
    Image|endswith: '\OUTLOOK.EXE'
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

  • Administrative activity

Tags

  • attack.persistence
  • attack.t1137

MITRE ATT&CK ids this rule names

Related rules

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_set/registry_set_office_outlook_security_settings.yml

Sources and licences

  • SigmaHQ

    "Outlook Security Settings Updated - Registry" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_office_outlook_security_settings.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: Outlook Security Settings Updated - Registry",
entity page, dataset version ref-06efa2082f30, updated 2026-01-09T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/c3cefdf4-6703-4e1c-bad8-bf422fc5015a (accessed 2026-11-03).
Underlying source: SigmaHQ rule c3cefdf4-6703-4e1c-bad8-bf422fc5015a, 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.