Users Authenticating To Other Azure AD Tenants

calendar Oct 23, 2025 · attack.privilege-escalation attack.persistence attack.defense-evasion attack.initial-access attack.t1078.004  ·
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Detect when users in your Azure AD tenant are authenticating to other Azure AD Tenants.

Sigma rule (View on GitHub)

 1title: Users Authenticating To Other Azure AD Tenants
 2id: 5f521e4b-0105-4b72-845b-2198a54487b9
 3status: test
 4description: Detect when users in your Azure AD tenant are authenticating to other Azure AD Tenants.
 5references:
 6    - https://learn.microsoft.com/en-gb/entra/architecture/security-operations-user-accounts#monitoring-external-user-sign-ins
 7author: MikeDuddington, '@dudders1'
 8date: 2022-06-30
 9tags:
10    - attack.privilege-escalation
11    - attack.persistence
12    - attack.defense-evasion
13    - attack.initial-access
14    - attack.t1078.004
15logsource:
16    product: azure
17    service: signinlogs
18detection:
19    selection:
20        Status: 'Success'
21        HomeTenantId: 'HomeTenantID'
22    filter:
23        ResourceTenantId|contains: 'HomeTenantID'
24    condition: selection and not filter
25falsepositives:
26    - If this was approved by System Administrator.
27level: medium

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