This threat detection rule monitors Amazon S3 activities specifically targeting object copies that utilize client-side encryption. The rule signifies potential unauthorized access attempts or other suspicious behavior since the copying of encrypted objects can be indicative of data compromise. Triggering this rule means the system has detected a CopyObject action in CloudTrail logs that employed client-side encryption, specifically indicated by the presence of specific encryption parameters in the request. The rule includes specific testing logs that help validate whether client-side encryption was applied, ensuring that necessary responses are activated for either authorized or unauthorized actions by users. Investigative actions are recommended when the rule triggers, including user verification and closely monitoring suspicious access patterns related to the S3 bucket.