title: Users Authenticating To Other Azure AD Tenants
id: 5f521e4b-0105-4b72-845b-2198a54487b9
status: test
description: Detect when users in your Azure AD tenant are authenticating to other Azure AD Tenants.
references:
- https://learn.microsoft.com/en-gb/entra/architecture/security-operations-user-accounts#monitoring-external-user-sign-ins
author: MikeDuddington, '@dudders1'
date: 2022-06-30
modified: 2026-05-08
tags:
- attack.privilege-escalation
- attack.persistence
- attack.initial-access
- attack.stealth
- attack.t1078.004
logsource:
product: azure
service: signinlogs
detection:
selection:
resultType: 0
homeTenantId|expand: '%HomeTenantID%'
filter_main_hometenantid:
resourceTenantId|contains|expand: '%HomeTenantID%'
condition: selection and not 1 of filter_main_*
falsepositives:
- Unlikely
level: medium