wiredmikey writes "Mitsubishi Heavy Industries Ltd, Japan's largest defense contractor, has been a victim of a cyber attack, according to a report from the company. The company said attackers had gained access to company computer systems, with some reports saying the attacks targeted its submarine, missile and nuclear power plant component businesses. According to The Yomiuri newspaper, approximately 80 systems had been infected with malware at the company's headquarters in Tokyo, as well as manufacturing and research and development sites, including Kobe Shipyard & Machinery Works, Nagasaki Shipyard & Machinery Works and Nagoya Guidance & Propulsion System Works. 'We can't rule out small possibilities of further information leakage but so far crucial data about our products or technologies have been kept safe,' a Mitsubishi Heavy spokesman told Reuters. 'We've found out that some system information such as IP addresses have been leaked and that's creepy enough,' the spokesman added."