This detection rule focuses on monitoring changes to the security group entries for Amazon RDS (Relational Database Service) databases. Modifications to security groups can pose significant security risks, as they dictate access controls for the database. Unauthorized or unintentional changes may inadvertently expose an RDS instance to the public Internet, potentially allowing access from unauthorized users or services. Furthermore, the rule also aims to capture any removal of essential security rules which could hinder legitimate service and user access, thereby affecting the database’s availability. This capability is crucial for maintaining proper access security and ensuring that the RDS databases remain safeguarded against possible exploits stemming from misconfigurations.