Name:O365 Service Principal Privilege Escalation id:b686d0bd-cca7-44ca-ae07-87f6465131d9 version:3 date:2025-02-10 author:Dean Luxton status:production type:TTP Description:This detection identifies when an Azure Service Principal elevates privileges by adding themself to a new app role assignment. Data_source:
-O365 Add app role assignment grant to user.
search:`o365_management_activity` Operation="Add app role assignment to service principal." "Actor{}.ID"=ServicePrincipal ResultStatus=Success | spath path=ModifiedProperties{} output=targetResources | eval src="NA" | stats min(_time) as _time values(eval(mvfilter(match(targetResources, "AppRole.Value")))) as appRole, values(eval(mvfilter(match(targetResources, "ServicePrincipal.DisplayName")))) as targetServicePrincipal values(object) as targetAppContext values(user_agent) as user_agent values(user) as servicePrincipal values(UserId) as servicePrincipalId by Operation InterSystemsId tenant_id user dest src vendor_account vendor_product signature | spath input=appRole path=NewValue output=appRole | spath input=targetServicePrincipal path=NewValue output=targetServicePrincipal | where servicePrincipal=targetServicePrincipal | fillnull | stats earliest(_time) as firstTime latest(_time) as lastTime by servicePrincipal servicePrincipalId appRole targetAppContext user_agent tenant_id InterSystemsId user dest src vendor_account vendor_product signature | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `o365_service_principal_privilege_escalation_filter`
how_to_implement:The Splunk Add-on for Microsoft Office 365 add-on is required to ingest EntraID audit logs via the 365 API. See references for links for further details on how to onboard this log source. known_false_positives:Unknown References: -https://splunkbase.splunk.com/app/4055 -https://github.com/mvelazc0/BadZure -https://www.splunk.com/en_us/blog/security/hunting-m365-invaders-navigating-the-shadows-of-midnight-blizzard.html -https://posts.specterops.io/microsoft-breach-what-happened-what-should-azure-admins-do-da2b7e674ebc drilldown_searches: name:'View the detection results for - "$servicePrincipal$"' search:'%original_detection_search% | search servicePrincipal = "$servicePrincipal$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$servicePrincipal$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$servicePrincipal$") starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' tags: analytic_story: - 'Azure Active Directory Privilege Escalation' - 'Office 365 Account Takeover' asset_type:Azure Tenant mitre_attack_id: - 'T1098.003' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' security_domain:identity
