Publicly disclosed information for this event

The victim is Japan's largest defense contractor. The company is known for producing missiles, aicraft parts as well as naval assets.

According to sources, the company revealed that hackers had infiltrated its computer systems. The target of this intrusion seems to have been their submarine, missile, and nuclear power plant component factories. Around 80 virus-compromised computers were discovered at multiple locations, including their Tokyo headquarters and various manufacturing and R&D sites. Notably, the attack corresponds to activities associated with cyber threats that other global defense contractors, amongst others in the U.S., faced around that time.

While the company spokesman emphasized that crucial data related to products or technologies remained secure, there was an admission that certain system information like IP addresses had been leaked. There's a potential, though considered minimal, for further information breaches. Various computer viruses, including the Trojan horse which is known for stealing vital information, were identified within its primary offices and production locations.