{"id":"5f521e4b-0105-4b72-845b-2198a54487b9","title":"Users Authenticating To Other Azure AD Tenants","description":"Detect when users in your Azure AD tenant are authenticating to other Azure AD Tenants.","author":"MikeDuddington, '@dudders1'","status":"test","level":"medium","date":"2022-06-30","modified":"","tags":["attack.privilege-escalation","attack.persistence","attack.initial-access","attack.stealth","attack.t1078.004"],"technique_ids":["T1078.004"],"logsource":{"product":"azure","service":"signinlogs"},"falsepositives":["If this was approved by System Administrator."],"references":["https://learn.microsoft.com/en-gb/entra/architecture/security-operations-user-accounts#monitoring-external-user-sign-ins"],"source_path":"rules/cloud/azure/signin_logs/azure_users_authenticating_to_other_azure_ad_tenants.yml","source_sha256":"04363118027bb65a71a325cc8523291daeeaedbbcdaa8879d3042bd037b00a6c","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/cloud/azure/signin_logs/azure_users_authenticating_to_other_azure_ad_tenants.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Users Authenticating To Other Azure AD Tenants\nid: 5f521e4b-0105-4b72-845b-2198a54487b9\nstatus: test\ndescription: Detect when users in your Azure AD tenant are authenticating to other Azure AD Tenants.\nreferences:\n    - https://learn.microsoft.com/en-gb/entra/architecture/security-operations-user-accounts#monitoring-external-user-sign-ins\nauthor: MikeDuddington, '@dudders1'\ndate: 2022-06-30\ntags:\n    - attack.privilege-escalation\n    - attack.persistence\n    - attack.initial-access\n    - attack.stealth\n    - attack.t1078.004\nlogsource:\n    product: azure\n    service: signinlogs\ndetection:\n    selection:\n        Status: 'Success'\n        HomeTenantId: 'HomeTenantID'\n    filter:\n        ResourceTenantId|contains: 'HomeTenantID'\n    condition: selection and not filter\nfalsepositives:\n    - If this was approved by System Administrator.\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1078.004","id":"T1078.004","name":"Cloud Accounts","page":"techniques/enterprise/T1078.004/"}],"data_path":"data/detection-rules/5f521e4b-0105-4b72-845b-2198a54487b9.json","kind":"sigma"}