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New application permissions granted through Active Directory

Your company uses SolarWinds Orion business software, which suffered the Sunburst Backdoor attack. You want to identify any lateral movement associated with attack by looking for newly granted permission to sensitive applications.

Procedure

  1. Ensure you have installed the Microsoft Azure Add-on for Splunk.
  2. Run the following search. You can optimize it by specifying an index and adjusting the time range.
sourcetype="azure:aad:audit" activityDisplayName="Add app role assignment to service principal" OR 
activityDisplayName="Add delegated permission grant" OR activityDisplayName="Add application" 
| stats  values(initiatedBy.user.userPrincipalName) AS UPN, values(targetResources{}.displayName) 
AS Target, values(targetResources{}.modifiedProperties{}.displayName) AS "Modified Resources", 
values(targetResources{}.modifiedProperties{}.oldValue) AS "Old Values", 
values(targetResources{}.modifiedProperties{}.newValue) 
AS "New Values" BY correlationId activityDisplayName
| fields - correlationId

Search explanation

The table provides an explanation of what each part of this search achieves. You can adjust this query based on the specifics of your environment.

Splunk Search Explanation

sourcetype="azure:aad:audit" 

Search only Azure Active Directory audit data.

activityDisplayName="Add app role assignment to service principal" OR 

activityDisplayName="Add delegated permission grant" OR activityDisplayName="Add application" 

Search for any one of the three permissions-related actions shown.

| stats  values(initiatedBy.user.userPrincipalName) AS UPN, values(targetResources{}.displayName) 

AS Target, values(targetResources{}.modifiedProperties{}.displayName) AS "Modified Resources", 

values(targetResources{}.modifiedProperties{}.oldValue) AS "Old Values", 

values(targetResources{}.modifiedProperties{}.newValue) 

AS "New Values" BY correlationId activityDisplayName

Calculate aggregate values for the modified properties as shown and group results by correlationId and action.

| fields - correlationId

Remove the correlationId field from the results.

Next steps

The Microsoft Azure Add-on for Splunk has additional searches and pre-built security content for Azure data that can help you interpret these results and take additional steps to resolve security concerns related to new application permissions being granted through Active Directory.

You might also be interested in other processes associated with the Detecting lateral movement with Active Directory data use case.