ID | Technique | Tactic |
---|---|---|
T1098 | Account Manipulation | Persistence |
T1098.003 | Additional Cloud Roles | Privilege Escalation |
Detection: Azure AD PIM Role Assigned
Description
The following analytic detects the assignment of an Azure AD Privileged Identity Management (PIM) role. It leverages Azure Active Directory events to identify when a user is added as an eligible member to a PIM role. This activity is significant because PIM roles grant elevated privileges, and their assignment should be closely monitored to prevent unauthorized access. If confirmed malicious, an attacker could exploit this to gain privileged access, potentially leading to unauthorized actions, data breaches, or further compromise of the environment.
Search
1`azure_monitor_aad` operationName="Add eligible member to role in PIM completed*"
2| rename properties.* as *
3| stats count min(_time) as firstTime max(_time) as lastTime values(user) as user values(targetResources{}.displayName) as displayName by result, operationName, initiatedBy.user.displayName
4| `security_content_ctime(firstTime)`
5| `security_content_ctime(lastTime)`
6| `azure_ad_pim_role_assigned_filter`
Data Source
Name | Platform | Sourcetype | Source |
---|---|---|---|
Azure Active Directory | Azure | 'azure:monitor:aad' |
'Azure AD' |
Macros Used
Name | Value |
---|---|
azure_monitor_aad | sourcetype=azure:monitor:aad |
azure_ad_pim_role_assigned_filter | search * |
azure_ad_pim_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
As part of legitimate administrative behavior, users may be assigned PIM roles. Filter as needed
Associated Analytic Story
Risk Based Analytics (RBA)
Risk Message | Risk Score | Impact | Confidence |
---|---|---|---|
An Azure AD PIM role assignment was assiged to $user$ | 35 | 70 | 50 |
References
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