Sigma rule: Activity Performed by Terminated User

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-071bfa4c59a6, updated 2022-10-09T00:00:00.000Z.

Rule

Title
Activity Performed by Terminated User
Status
test
Level
medium
Author
Austin Songer @austinsonger
Date
2021-08-23
Modified
2022-10-09
File
rules/cloud/m365/threat_management/microsoft365_activity_by_terminated_user.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects when a Microsoft Cloud App Security reported for users whose account were terminated in Azure AD, but still perform activities in other platforms such as AWS or Salesforce.
This is especially relevant for users who use another account to manage resources, since these accounts are often not terminated when a user leaves the company.

Log source

product
m365
service
threat_management

Detection

selection:
    eventSource: SecurityComplianceCenter
    eventName: 'Activity performed by terminated user'
    status: success
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.impact

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/m365/threat_management/microsoft365_activity_by_terminated_user.yml

Sources and licences

  • SigmaHQ

    "Activity Performed by Terminated User" by Austin Songer @austinsonger (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/m365/threat_management/microsoft365_activity_by_terminated_user.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: Activity Performed by Terminated User",
entity page, dataset version ref-071bfa4c59a6, updated 2022-10-09T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/2e669ed8-742e-4fe5-b3c4-5a59b486c2ee (accessed 2026-11-03).
Underlying source: SigmaHQ rule 2e669ed8-742e-4fe5-b3c4-5a59b486c2ee, 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.