Azure Login Explicitly Denied MFA

azure

Classification:

attack

Tactic:

TA0006-credential-access

Technique:

T1110-brute-force

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Goal

Detect and identify the network IP address when multiple user accounts failed to complete the MFA process.

Strategy

Monitor Azure Active Directory Sign-in logs and detect when any @evt.category is equal to SignInLogs, @properties.authenticationRequirement is equal to multiFactorAuthentication and @evt.outcome is equal to failure.

Triage and response

  1. Inspect the log and determine if this was a valid login attempt.
  2. If the user was compromised, rotate user credentials.