Detecting unauthorized access to an AWS account is crucial for maintaining security. One common method of gaining unauthorized access is through the use of assumed roles, which can be difficult to track due to the permission model in AWS environments. Datadog Cloud SIEM offers a solution by automatically detecting when a user assumes a role, allowing users to determine whether the role change is legitimate or not. This helps prevent potential security threats from escalating further. By using term detection methods and setting up rules that monitor for unfamiliar accounts assuming roles, users can receive alerts and investigate any suspicious activity in their cloud environments.