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Description

This Splunk analytic flags the assignment of three high-risk Graph API permissions in Azure AD, Application.ReadWrite.All (1bfefb4e-e0b5-418b-a88f-73c46d2cc8e9), AppRoleAssignment.ReadWrite.All (06b708a9-e830-4db3-a914-8e69da51d44f), and RoleManagement.ReadWrite.Directory (9e3f62cf-ca93-4989-b6ce-bf83c28f9fe8). These permissions enable broad control over Azure AD, including application and directory settings. Utilizing azure_monitor_aad data, the query scans AuditLogs for 'Update application' operations, identifying when these permissions are assigned. It collects data on user, object, and user agent. Immediate attention is needed upon detection, as misuse of these permissions can lead to unauthorized Azure AD modifications and potential security breaches.

  • Type: TTP

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2024-01-30
  • Author: Mauricio Velazco, Splunk
  • ID: 5521f8c5-1aa3-473c-9eb7-853701924a06

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` category=AuditLogs operationName="Update application"  
| eval newvalue = mvindex('properties.targetResources{}.modifiedProperties{}.newValue',0) 
| spath input=newvalue  
| search "{}.RequiredAppPermissions{}.EntitlementId"="1bfefb4e-e0b5-418b-a88f-73c46d2cc8e9" OR "{}.RequiredAppPermissions{}.EntitlementId"="06b708a9-e830-4db3-a914-8e69da51d44f" OR "{}.RequiredAppPermissions{}.EntitlementId"="9e3f62cf-ca93-4989-b6ce-bf83c28f9fe8"  
| eval Permissions = '{}.RequiredAppPermissions{}.EntitlementId' 
| stats count earliest(_time) as firstTime latest(_time) as lastTime values(Permissions) by user, object, user_agent, operationName 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)`   
| `azure_ad_privileged_graph_api_permission_assigned_filter`

Macros

The SPL above uses the following Macros:

:information_source: azure_ad_privileged_graph_api_permission_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
  • category
  • operationName
  • properties.targetResources{}.modifiedProperties{}.newValue
  • user
  • object
  • user_agent

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

Privileged Graph API permissions may be assigned for legitimate purposes. Filter as needed.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
54.0 90 60 User $user$ assigned privileged Graph API permissions to $object$

: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

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