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Description

The following analytic identifies the assignment of the Azure AD Global Administrator role to an Azure AD user. The Global Administrator role is the most powerful administrator role in Azure AD and provides almost unlimited access to data, resources and settings. It is equivalent to the Domain Administrator group in an Active Directory environment. While Azure AD roles do not grant access to Azure services and resources, it is possible for a Global Administrator account to gain control of Azure resources. Adversaries and red teams alike may assign this role to a compromised account to establish Persistence in an Azure AD environment.

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

  • Last Updated: 2022-08-17
  • Author: Gowthamaraj Rajendran, Mauricio Velazco, Splunk
  • ID: 825fed20-309d-4fd1-8aaf-cd49c1bb093c

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1098.003 Additional Cloud Roles Persistence
Kill Chain Phase
  • Exploitation
NIST
  • DE.CM
CIS20
  • CIS 3
  • CIS 5
  • CIS 16
CVE
1
2
3
4
5
6
`azuread` "body.operationName"="Add member to role"  "body.properties.targetResources{}.modifiedProperties{}.newValue"="\"Global Administrator\"" 
| rename body.properties.* as * 
| rename targetResources{}.userPrincipalName as userPrincipalName 
| rename initiatedBy.user.userPrincipalName as initiatedBy 
| stats values(userPrincipalName) by _time, initiatedBy, result, body.operationName 
| `azure_ad_global_administrator_role_assigned_filter`

Macros

The SPL above uses the following Macros:

:information_source: azure_ad_global_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
  • body.properties.targetResources{}.userPrincipalName
  • body.properties.targetResources{}.type
  • body.properties.initiatedBy.user.userPrincipalName
  • body.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. Specifically, this analytic leverages the AuditLogs log category.

Known False Positives

Administrators may legitimately assign the Global Administrator role to a user. Filter as needed.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
72.0 80 90 Global Administrator Role assigned for User $userPrincipalName$ 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

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