This detection rule identifies failed authentication attempts during Multi-Factor Authentication (MFA) challenges in Google Cloud Platform (GCP) environments. It specifically focuses on events recorded in Google Workspace login failure logs, where users attempt to authenticate but do not successfully complete the MFA process. Such events are crucial for security monitoring as they can indicate that an attacker is attempting to gain access to accounts using compromised credentials, despite the presence of MFA defenses. If left unchecked, these scenarios could potentially lead to unauthorized access to sensitive cloud resources, jeopardizing data integrity and security within the GCP infrastructure. The rule utilizes the `gws_reports_login` data source to track login failures and correlates this with MFA challenge events, compiling metrics such as the total count of failures and timeframes associated with each incident.