Activity Performed by Terminated User

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.

Sigma rule (View on GitHub)

 1title: Activity Performed by Terminated User
 2id: 2e669ed8-742e-4fe5-b3c4-5a59b486c2ee
 3status: test
 4description: |
 5  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.
 6  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.  
 7references:
 8    - https://learn.microsoft.com/en-us/defender-cloud-apps/anomaly-detection-policy
 9    - https://learn.microsoft.com/en-us/defender-cloud-apps/policy-template-reference
10author: Austin Songer @austinsonger
11date: 2021/08/23
12modified: 2022/10/09
13tags:
14    - attack.impact
15logsource:
16    service: threat_management
17    product: m365
18detection:
19    selection:
20        eventSource: SecurityComplianceCenter
21        eventName: 'Activity performed by terminated user'
22        status: success
23    condition: selection
24falsepositives:
25    - Unknown
26level: medium

References

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