This detection rule focuses on identifying potential data exfiltration activities within Google Cloud Storage (GCS) by monitoring copy operations of GCS objects between buckets. Particularly, it detects instances where objects are copied from one bucket to another, especially when the destination bucket doesn't belong to the same project as the source bucket, which could indicate malicious actors attempting to exfiltrate sensitive information. The rule establishes a threshold of 10 copy operations, which is indicative of bulk exfiltration, and uses GCP Audit logs to track 'storage.objects.get' operations that contain a destination field in their metadata, marking them as copy actions. The approach emphasizes reviewing IAM permissions, analyzing access patterns, and looking for additional exfiltration indicators or ransomware activities related to the user in question.