ID | Technique | Tactic |
---|---|---|
T1098.003 | Additional Cloud Roles | Persistence |
Detection: Azure AD Global Administrator Role Assigned
Description
The following analytic detects the assignment of the Azure AD Global Administrator role to a user. It leverages Azure Active Directory AuditLogs to identify when the "Add member to role" operation includes the "Global Administrator" role. This activity is significant because the Global Administrator role grants extensive access to data, resources, and settings, similar to a Domain Administrator in traditional AD environments. If confirmed malicious, this could allow an attacker to establish persistence, escalate privileges, and potentially gain control over Azure resources, posing a severe security risk.
Search
1`azure_monitor_aad` operationName="Add member to role" properties.targetResources{}.modifiedProperties{}.newValue="\"Global Administrator\""
2| rename properties.* as *
3| rename initiatedBy.user.userPrincipalName as initiatedBy
4| stats count min(_time) as firstTime max(_time) as lastTime values(user) as user by initiatedBy, result, operationName
5| `security_content_ctime(firstTime)`
6| `security_content_ctime(lastTime)`
7| `azure_ad_global_administrator_role_assigned_filter`
Data Source
Name | Platform | Sourcetype | Source | Supported App |
---|---|---|---|---|
Azure Active Directory Add member to role | Azure | 'azure:monitor:aad' |
'Azure AD' |
N/A |
Macros Used
Name | Value |
---|---|
azure_monitor_aad | sourcetype=azure:monitor:aad |
azure_ad_global_administrator_role_assigned_filter | search * |
azure_ad_global_administrator_role_assigned_filter
is an empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Annotations
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 |
Implementation
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 AuditLogs log category.
Known False Positives
Administrators may legitimately assign the Global Administrator role to a user. Filter as needed.
Associated Analytic Story
Risk Based Analytics (RBA)
Risk Message | Risk Score | Impact | Confidence |
---|---|---|---|
Global Administrator Role assigned for User $user$ initiated by $initiatedBy$ | 72 | 80 | 90 |
References
-
https://www.mandiant.com/resources/detecting-microsoft-365-azure-active-directory-backdoors
-
https://docs.microsoft.com/en-us/azure/active-directory/roles/security-planning
-
https://docs.microsoft.com/en-us/azure/role-based-access-control/elevate-access-global-admin
Detection Testing
Test Type | Status | Dataset | Source | Sourcetype |
---|---|---|---|---|
Validation | ✅ Passing | N/A | N/A | N/A |
Unit | ✅ Passing | Dataset | Azure AD |
azure:monitor:aad |
Integration | ✅ Passing | Dataset | Azure AD |
azure:monitor:aad |
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: 5