Multifactor Authentication Interrupted

Title: Multifactor Authentication Interrupted
Status: test
Description:Identifies user login with multifactor authentication failures, which might be an indication an attacker has the password for the account but can't pass the MFA challenge.
References:
  -https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-accounts
Author: AlertIQ
Date: 2021-10-10
modified:2022-12-18
Tags:

• -'attack.privilege-escalation'
• -'attack.persistence'
• -'attack.initial-access'
• -'attack.credential-access'
• -'attack.stealth'
• -'attack.t1078.004'
• -'attack.t1110'
• -'attack.t1621'

Logsource:

• product: azure
• service: signinlogs

Detection:
  selection_50074:
    ResultType: '50074'
    ResultDescription|contains: 'Strong Auth required'
  selection_500121:
    ResultType: '500121'
    ResultDescription|contains: 'Authentication failed during strong authentication request'
  condition:1 of selection_*
Falsepositives:
  -Unknown
Level: medium