ID | Technique | Tactic |
---|---|---|
T1003.002 | Security Account Manager | Credential Access |
Detection: Azure AD Privileged Authentication Administrator Role Assigned
Description
The following analytic detects the assignment of the Privileged Authentication Administrator role to an Azure AD user. It leverages Azure Active Directory audit logs to identify when this specific role is assigned. This activity is significant because users in this role can set or reset authentication methods for any user, including those in privileged roles like Global Administrators. If confirmed malicious, an attacker could change credentials and assume the identity and permissions of high-privilege users, potentially leading to unauthorized access to sensitive information and critical configurations.
Search
1`azure_monitor_aad` "operationName"="Add member to role" "properties.targetResources{}.modifiedProperties{}.newValue"="\"Privileged Authentication 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_privileged_authentication_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_privileged_authentication_administrator_role_assigned_filter | search * |
azure_ad_privileged_authentication_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. This analytic was written to be used with the azure:monitor:aad sourcetype leveraging the AuditLog log category.
Known False Positives
Administrators may legitimately assign the Privileged Authentication Administrator role as part of administrative tasks. Filter as needed.
Associated Analytic Story
Risk Based Analytics (RBA)
Risk Message | Risk Score | Impact | Confidence |
---|---|---|---|
The privileged Azure AD role Privileged Authentication Administrator was assigned for User $user$ initiated by $initiatedBy$ | 50 | 100 | 50 |
References
-
https://posts.specterops.io/azure-privilege-escalation-via-azure-api-permissions-abuse-74aee1006f48
-
https://learn.microsoft.com/en-us/azure/active-directory/roles/permissions-reference
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: 4