{"id":"8dee7a0d-43fd-4b3c-8cd1-605e189d195e","title":"User State Changed From Guest To Member","description":"Detects the change of user type from \"Guest\" to \"Member\" for potential elevation of privilege.","author":"MikeDuddington, '@dudders1'","status":"test","level":"medium","date":"2022-06-30","modified":"","tags":["attack.persistence","attack.privilege-escalation","attack.initial-access","attack.stealth","attack.t1078.004"],"technique_ids":["T1078.004"],"logsource":{"product":"azure","service":"auditlogs"},"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/audit_logs/azure_guest_to_member.yml","source_sha256":"3c41da7c4b806394e2654dd166339b2c14f0614486405bbaaf875ee42340203e","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/cloud/azure/audit_logs/azure_guest_to_member.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: User State Changed From Guest To Member\nid: 8dee7a0d-43fd-4b3c-8cd1-605e189d195e\nstatus: test\ndescription: Detects the change of user type from \"Guest\" to \"Member\" for potential elevation of privilege.\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.persistence\n    - attack.privilege-escalation\n    - attack.initial-access\n    - attack.stealth\n    - attack.t1078.004\nlogsource:\n    product: azure\n    service: auditlogs\ndetection:\n    selection:\n        Category: 'UserManagement'\n        OperationName: 'Update user'\n        properties.message: '\"displayName\":\"UserType\",\"oldValue\":\"[\\\"Guest\\\"]\",\"newValue\":\"[\\\"Member\\\"]\"'\n    condition: selection\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/8dee7a0d-43fd-4b3c-8cd1-605e189d195e.json","kind":"sigma"}