This detection rule monitors for the registration of new Multi-Factor Authentication (MFA) methods for AWS accounts, as recorded in AWS CloudTrail logs. It specifically looks for the CreateVirtualMFADevice event, which is a critical action potentially indicating that an adversary has gained unauthorized access and is trying to establish persistence by adding an MFA device. This can complicate detection and removal efforts, thereby heightening the risk of data breaches or further unauthorized access to sensitive resources. By leveraging this analytic, organizations can better safeguard against such threats and enhance their security posture.