Sigma rule: User Removed From Group With CA Policy Modification Access

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-5d3fbbc15764, updated 2022-08-04T00:00:00.000Z.

Rule

Title
User Removed From Group With CA Policy Modification Access
Status
test
Level
medium
Author
Mark Morowczynski '@markmorow', Thomas Detzner '@tdetzner'
Date
2022-08-04
File
rules/cloud/azure/audit_logs/azure_group_user_removal_ca_modification.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Monitor and alert on group membership removal of groups that have CA policy modification access

Log source

product
azure
service
auditlogs

Detection

selection:
    properties.message: Remove member from group
condition: selection

False positives (as the rule lists them)

  • User removed from the group is approved

Tags

  • attack.privilege-escalation
  • attack.credential-access
  • attack.persistence
  • attack.defense-impairment
  • attack.t1548
  • attack.t1556

MITRE ATT&CK ids this rule names

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/cloud/azure/audit_logs/azure_group_user_removal_ca_modification.yml

Sources and licences

  • SigmaHQ

    "User Removed From Group With CA Policy Modification Access" by Mark Morowczynski '@markmorow', Thomas Detzner '@tdetzner' (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/azure/audit_logs/azure_group_user_removal_ca_modification.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: User Removed From Group With CA Policy Modification Access",
entity page, dataset version ref-5d3fbbc15764, updated 2022-08-04T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/665e2d43-70dc-4ccc-9d27-026c9dd7ed9c (accessed 2026-11-03).
Underlying source: SigmaHQ rule 665e2d43-70dc-4ccc-9d27-026c9dd7ed9c, 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.