The infected sites included its submarine manufacturing plant in Kobe and the Nagoya Guidance & Propulsion System Works, which makes engine parts for missiles.
The Japanese newspaper Yomiuri claimed that at least eight different pieces of malware, including some which stole data, were discovered at Mitsubishi sites. A Mitsubishi spokesperson, however, was quoted as saying that "there is no possibility of any leakage of defense-related information at this point."
The company first noticed the attack on August 11th, and expects to have the results of an investigation into the security breach by the end of September.
If Mitsubishi Heavy Industries was targeted by hackers, the obvious question to ask is who was behind the attack and what was the motive?
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