Azure AD Service Principal Owner Added

name: Azure AD Service Principal Owner Added
id: 7ddf2084-6cf3-4a44-be83-474f7b73c701
version: 14
creation_date: '2022-08-30'
modification_date: '2026-05-13'
author: Mauricio Velazco, Gowthamaraj Rajendran, Splunk
status: production
type: TTP
description: The following analytic detects the addition of a new owner to a Service Principal within an Azure AD tenant. It leverages Azure Active Directory events from the AuditLog log category to identify this activity. This behavior is significant because Service Principals do not support multi-factor authentication or conditional access policies, making them a target for adversaries seeking persistence or privilege escalation. If confirmed malicious, this activity could allow attackers to maintain access to the Azure AD environment with single-factor authentication, potentially leading to unauthorized access and control over critical resources.
data_source:
    - Azure Active Directory Add owner to application
search: |-
    `azure_monitor_aad` operationName="Add owner to application"
      | rename properties.* as *
      | rename initiatedBy.user.userPrincipalName as initiatedBy
      | rename targetResources{}.userPrincipalName as newOwner
      | rename targetResources{}.modifiedProperties{}.newValue as displayName
      | eval displayName = mvindex(displayName,1)
      | where initiatedBy!=newOwner
      | fillnull
      | stats count min(_time) as firstTime max(_time) as lastTime
        BY dest user src
           vendor_account vendor_product initiatedBy
           result newOwner displayName
           signature
      | `security_content_ctime(firstTime)`
      | `security_content_ctime(lastTime)`
      | `azure_ad_service_principal_owner_added_filter`
how_to_implement: You must install the latest version of Splunk Add-on for Microsoft Cloud Services from Splunkbase(https://splunkbase.splunk.com/app/3110/#/details). You must be ingesting Azure Active Directory events into your Splunk environment through an EventHub. This analytic was written to be used with the azure:monitor:aad sourcetype leveraging the AuditLog log category.
known_false_positives: Administrator may legitimately add new owners for Service Principals. Filter as needed.
references:
    - https://attack.mitre.org/techniques/T1098/
finding:
    title: A new owner was added for service principal $displayName$ by $initiatedBy$
    entity:
        field: initiatedBy
        type: user
        score: 50
intermediate_findings:
    entities:
        - field: displayName
          type: user
          score: 50
          message: A new owner was added for service principal $displayName$ by $initiatedBy$
analytic_story:
    - Azure Active Directory Persistence
    - Azure Active Directory Privilege Escalation
    - NOBELIUM Group
asset_type: Azure Active Directory
mitre_attack_id:
    - T1098
product:
    - Splunk Enterprise
    - Splunk Enterprise Security
    - Splunk Cloud
category: cloud
security_domain: audit