Okta MFA Push Fatigue Brute Force Attack
This rule detects a successful Okta login that occurs after multiple failed MFA push notifications within a 15-minute window. It correlates 'system.push.send_factor_verify_push' events (representing MFA push attempts) with a subsequent 'user.authentication.auth_via_mfa' event (representing a successful MFA authentication and login). The rule specifically looks for more than 4 MFA push attempts followed by a successful login, indicating a potential MFA brute-force or push fatigue attack.
YARA-L
