The AWS ECR CRUD Actions rule identifies activities related to Create, Read, Update, or Delete (CRUD) operations performed on Amazon Elastic Container Registry (ECR). It specifically detects unauthorized or improper access attempts that can lead to unexpected alterations or disclosures of container images. The rule leverages AWS CloudTrail logs to monitor ECR actions and verify whether the actions are performed by legitimate, authorized accounts, within permitted regions, and under compliant configurations. It raises alerts when unauthorized access patterns are detected based on preconfigured testing scenarios.