{"id":"e40f4962-b02b-4192-9bfe-245f7ece1f99","title":"Multifactor Authentication Denied","description":"User has indicated they haven't instigated the MFA prompt and could indicate an attacker has the password for the account.","author":"AlertIQ","status":"test","level":"medium","date":"2022-03-24","modified":"","tags":["attack.privilege-escalation","attack.persistence","attack.initial-access","attack.credential-access","attack.stealth","attack.t1078.004","attack.t1110","attack.t1621"],"technique_ids":["T1078.004","T1110","T1621"],"logsource":{"product":"azure","service":"signinlogs"},"falsepositives":["Users actually login but miss-click into the Deny button when MFA prompt."],"references":["https://www.microsoft.com/security/blog/2022/03/22/dev-0537-criminal-actor-targeting-organizations-for-data-exfiltration-and-destruction/"],"source_path":"rules/cloud/azure/signin_logs/azure_mfa_denies.yml","source_sha256":"ced77e7d3a0c4e1756c5f29bd6b860eb525dce951c014971e09e9fbf72203002","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/cloud/azure/signin_logs/azure_mfa_denies.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Multifactor Authentication Denied\nid: e40f4962-b02b-4192-9bfe-245f7ece1f99\nstatus: test\ndescription: User has indicated they haven't instigated the MFA prompt and could indicate an attacker has the password for the account.\nreferences:\n    - https://www.microsoft.com/security/blog/2022/03/22/dev-0537-criminal-actor-targeting-organizations-for-data-exfiltration-and-destruction/\nauthor: AlertIQ\ndate: 2022-03-24\ntags:\n    - attack.privilege-escalation\n    - attack.persistence\n    - attack.initial-access\n    - attack.credential-access\n    - attack.stealth\n    - attack.t1078.004\n    - attack.t1110\n    - attack.t1621\nlogsource:\n    product: azure\n    service: signinlogs\ndetection:\n    selection:\n        AuthenticationRequirement: 'multiFactorAuthentication'\n        Status|contains: 'MFA Denied'\n    condition: selection\nfalsepositives:\n    - Users actually login but miss-click into the Deny button when MFA prompt.\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/"},{"key":"enterprise/T1110","id":"T1110","name":"Brute Force","page":"techniques/enterprise/T1110/"},{"key":"enterprise/T1621","id":"T1621","name":"Multi-Factor Authentication Request Generation","page":"techniques/enterprise/T1621/"}],"data_path":"data/detection-rules/e40f4962-b02b-4192-9bfe-245f7ece1f99.json","kind":"sigma"}