Orca detected that an API call to 'DeleteTrail' CloudTrail events was made from a tor IP - {MaliciousIp.MaliciousIp}, the operation was successful. Aws CloudTrail service consists of a set of trails, each defines a different logging configuration. By calling the DeleteTrail api, logging in a specific trail will be disabled. The call from a tor ip might indicates of an attempt of an attacker to avoid logging.
Recommended Mitigation
It is recommended to review the permissions which were used to make this api call. If it is possible, create a new trail and look for a malicious activity from the tor address.