The GCP Snapshot Creation Detection rule is designed to monitor and detect unauthorized snapshot creations within Google Cloud Platform (GCP) Compute Engine. It particularly focuses on identifying actions taken by users with unexpected email domains, which may indicate potential unauthorized access or activities. The rule leverages GCP Audit Logs to audit snapshot creation events, flagging any instance where a user from a domain not recognized or authorized by the organization's policy attempts to create a snapshot of a Compute Disk. This functionality helps organizations mitigate risks of data exfiltration by providing the necessary alerts for further investigation. The configuration requires close attention to authorized domains and a systematic review of snapshot activities to maintain compliance and safeguard sensitive data. The associated runbook emphasizes investigating unauthorized snapshot creations promptly, ensuring that security protocols are upheld, and provides a direct link to the relevant GCP documentation for further context. Overall, this rule falls under the regulatory framework of cloud compliance and governance, underscoring the importance of domain validation.