Name:Azure AD Service Principal Privilege Escalation id:29eb39d3-2bc8-49cc-99b3-35593191a588 version:10 date:None 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:
-Azure Active Directory Add app role assignment to service principal
search:`azure_monitor_aad` category=AuditLogs operationName="Add app role assignment to service principal" properties.initiatedBy.app.displayName=* properties.result=Success | spath path=properties{}.targetResources{}.modifiedProperties{} output=targetResources | rename properties.* as * | eval user="NA" | eval src="NA" | stats min(_time) as firstTime max(_time) as lastTime values(eval(mvfilter(match(targetResources, "AppRole.Value")))) as appRole, values(eval(mvfilter(match(targetResources, "ServicePrincipal.DisplayName")))) as targetServicePrincipal values(eval(mvindex('properties.targetResources{}.displayName',0))) as targetAppContext values(user_agent) as user_agent values(identity) as servicePrincipal values(properties.initiatedBy.app.servicePrincipalId) as servicePrincipalId by dest user src vendor_account vendor_product signature | spath input=appRole path=newValue output=appRole | spath input=targetServicePrincipal path=newValue output=targetServicePrincipal | eval appRole=trim(replace(appRole, "\"", "")), targetServicePrincipal=trim(replace(targetServicePrincipal, "\"", "")) | where servicePrincipal=targetServicePrincipal | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `azure_ad_service_principal_privilege_escalation_filter`
how_to_implement:The Splunk Add-on for Microsoft Cloud Services add-on is required to ingest EntraID audit logs via Azure EventHub. See reference for links for further details on how to onboard this log source. known_false_positives:No false positives have been identified at this time. References: -https://splunkbase.splunk.com/app/3110 -https://splunk.github.io/splunk-add-on-for-microsoft-cloud-services/Install/ -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 ("$servicePrincipal$") | 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:'7d' latest_offset:'0' analytic_story:['Azure Active Directory Privilege Escalation']
