SAN ANTONIO (BLOOMBERG) - VT San Antonio Aerospace, which provides maintenance, repair and overhaul services to aircraft, was hit with a ransomware attack affecting its United States commercial operations.A criminal group known as Maze "gained unauthorised access to our network and deployed a ransomware attack", according to a Friday (June 5) statement by Mr Ed Onwe, vice-president and general manager of the company.The firm is a subsidiary of the North American headquarters of Singapore's ST Engineering."At this point, our ongoing investigation indicates that the threat has been contained, and we believe it to be isolated to a limited number of ST Engineering's US commercial operations. Currently, our business continues to be operational," Mr Onwe said.Maze, the criminal group, has become infamous for deploying ransomware, including an April attack on Cognizant Technology Solutions, one of the world's largest providers of IT services.In response to the incident, Mr Onwe said the company disconnected systems, informed law enforcement and retained forensic advisers.