| ID | Technique | Tactic |
|---|---|---|
| T1098.003 | Additional Cloud Roles | Persistence |
| T1098 | Account Manipulation | Privilege Escalation |
Detection: O365 Service Principal Privilege Escalation
Description
This detection identifies when an Azure Service Principal elevates privileges by adding themself to a new app role assignment.
Search
1`o365_management_activity` Operation="Add app role assignment to service principal." "Actor{}.ID"=ServicePrincipal ResultStatus=Success
2| spath path=ModifiedProperties{} output=targetResources
3| 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
4| spath input=appRole path=NewValue output=appRole
5| spath input=targetServicePrincipal path=NewValue output=targetServicePrincipal
6| where servicePrincipal=targetServicePrincipal
7| table _time Operation servicePrincipal servicePrincipalId appRole targetAppContext user_agent tenant_id InterSystemsId
8| `o365_service_principal_privilege_escalation_filter`
Data Source
No data sources specified for this detection.
Macros Used
| Name | Value |
|---|---|
| o365_management_activity | sourcetype=o365:management:activity |
| o365_service_principal_privilege_escalation_filter | search * |
o365_service_principal_privilege_escalation_filter is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Annotations
MITRE ATT&CK
Kill Chain Phases
NIST
CIS
Threat Actors
Exploitation
Installation
DE.CM
CIS 10
LAPSUS$
Scattered Spider
HAFNIUM
Lazarus Group
Default Configuration
This detection is configured by default in Splunk Enterprise Security to run with the following settings:
| Setting | Value |
|---|---|
| Disabled | true |
| Cron Schedule | 0 * * * * |
| Earliest Time | -70m@m |
| Latest Time | -10m@m |
| Schedule Window | auto |
| Creates Notable | Yes |
| Rule Title | %name% |
| Rule Description | %description% |
| Notable Event Fields | user, dest |
| Creates Risk Event | True |
This configuration file applies to all detections of type TTP. These detections will use Risk Based Alerting and generate Notable Events.
Implementation
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
Associated Analytic Story
Risk Based Analytics (RBA)
Risk Message:
Service Principal $servicePrincipal$ has elevated privileges by adding themself to app role $appRole$
| Risk Object | Risk Object Type | Risk Score | Threat Objects |
|---|---|---|---|
| servicePrincipal | user | 100 | user_agent |
References
Detection Testing
| Test Type | Status | Dataset | Source | Sourcetype |
|---|---|---|---|---|
| Validation | ✅ Passing | N/A | N/A | N/A |
| Unit | ✅ Passing | Dataset | Office 365 |
o365:management:activity |
| Integration | ✅ Passing | Dataset | Office 365 |
o365:management:activity |
Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI.
Alternatively you can replay a dataset into a Splunk Attack Range
Source: GitHub | Version: 1