The AWS GuardDuty Critical Severity Finding rule is designed to monitor and alert on critical-severity findings generated by AWS GuardDuty regarding potential security threats to AWS environments. This rule identifies findings categorized as critical severity, indicating that immediate attention is required. By analyzing logs related to GuardDuty findings, security teams can investigate potential security incidents involving compromised credentials, suspicious activities, or unauthorized access attempts. The rule provides a runbook to guide analysts in pursuing root cause analysis by referencing the relevant GuardDuty finding types.