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Description

The following analytic identifies the assignment of the Privileged Authentication Administrato role to an Azure AD user. Users in this role can set or reset authentication methods for any user in Azure Active Directory, including privileged roles like Global Administrators. Users with this role can change credentials for people who may have access to sensitive or private information or critical configuration inside and outside of Azure Active Directory. Changing the credentials of a user may mean the ability to assume that users identity and permissions. Red teams and adversaries alike may abuse this role to escalate their privileges.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Authentication
  • Last Updated: 2023-12-20
  • Author: Mauricio Velazco, Gowthamaraj Rajendran, Splunk
  • ID: a7da845d-6fae-41cf-b823-6c0b8c55814a

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1003.002 Security Account Manager Credential Access
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 10
CVE 


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 `azure_monitor_aad`  "operationName"="Add member to role"  "properties.targetResources{}.modifiedProperties{}.newValue"="\"Privileged Authentication Administrator\"" 
| rename properties.* as * 
| rename initiatedBy.user.userPrincipalName as initiatedBy 
| stats count min(_time) as firstTime max(_time) as lastTime values(user) as user by initiatedBy, result, operationName 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `azure_ad_privileged_authentication_administrator_role_assigned_filter`

Macros

The SPL above uses the following Macros:

:information_source: azure_ad_privileged_authentication_administrator_role_assigned_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • _time
  • user
  • properties.targetResources{}.type
  • properties.initiatedBy.user.userPrincipalName
  • properties.result

How To Implement

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

RBA

Risk Score Impact Confidence Message
50.0 100 50 The privileged Azure AD role Privileged Authentication Administrator was assigned for User $user$ initiated by $initiatedBy$

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

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 | version: 2