Possible SignIn from Azure Backdoor

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Identifies when a user adds an unverified domain as an authentication method, followed by a sign-in from a user the newly added domain. Threat actors may add custom domains to create a backdoor to your tenant. It's important to monitor whenever custom domains are added to the tenant.

Attribute Value
Type Analytic Rule
Solution Microsoft Entra ID
ID fa00014c-c5f4-4715-8f5b-ba567e19e41e
Severity Medium
Kind Scheduled
Tactics Persistence
Techniques T1098
Required Connectors AzureActiveDirectory
Source View on GitHub

Tables Used

This content item queries data from the following tables:

Table Selection Criteria Transformations Ingestion API Lake-Only
AuditLogs OperationName == "Add unverified domain" ?
SigninLogs ?

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