The 'Duo Admin Marked Push Fraudulent' detection rule is designed to identify incidences where a Duo administrator marks a two-factor authentication (2FA) push request as fraudulent. This situation typically arises when an unauthorized access attempt is flagged by an administrator using the Duo security platform. The rule monitors event logs from the Duo Administrator to determine whether an administrative action has been taken regarding a fraudulent authentication attempt. When such an event is logged, an alert is triggered, indicating a possible security threat. The detection criteria rely on specific log entries such as the action 'admin_2fa_error' and its associated details like IP address, email, and error description. The rule categorizes itself under medium severity, suggesting that it is important but not an immediate threat needing urgent attention. It also has a deduplication period of 15 minutes to prevent alert fatigue from repetitive logging of similar fraudulent pushes.