Azure Service Principal Removed

 1title: Azure Service Principal Removed
 2id: 448fd1ea-2116-4c62-9cde-a92d120e0f08
 3status: test
 4description: Identifies when a service principal was removed in Azure.
 5references:
 6    - https://docs.microsoft.com/en-us/azure/active-directory/reports-monitoring/reference-audit-activities#application-proxy
 7author: Austin Songer @austinsonger
 8date: 2021/09/03
 9modified: 2022/10/09
10tags:
11    - attack.defense_evasion
12logsource:
13    product: azure
14    service: activitylogs
15detection:
16    selection:
17        properties.message: Remove service principal
18    condition: selection
19falsepositives:
20    - Service principal being removed may be performed by a system administrator.
21    - Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.
22    - Service principal removed from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
23level: medium