BREAKING No Signs of Cyberattack in FAA Ground Stop as FBI Probes Incident
Connect with us

Hi, what are you looking for?

SecurityWeekSecurityWeek

Security Infrastructure

Japan’s Largest Defense Contractor Hit by Cyber Attack

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.

Mitsubishi Heavy Industries Hacked

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.

Mitsubishi Heavy Industries Hacked

“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.

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. A company spokesperson told SecurityWeek that 45 servers and 38 PCs in MHI’s production plants and offices (more than 10) were infected.

The company reportedly first noticed the cyber attack on August 11th.

“It’s probably just the first that hacking attacks in Japan have been detected. It’s consistent with what we’ve seen already with big American defense companies,” Andrew Davies, a cyber-warfare analyst with the government backed defense think-tank, the Australian Strategic Policy Institute, told Reuters.

The company manufactures many weapons systems and aircraft including Patriot missiles, under license from Raytheon, F-15J Fighter Jets, under license from Boeing, and several other guided weapons systems.

Advertisement. Scroll to continue reading.

While some have speculated that China may behind the attacks, the company told SecurityWeek that, at present, they have no clues as to who was behind the attacks. The company is expected to release additional information and an updated statement following further investigation.

Related Reading:

Lockheed Martin Acknowledges “Tenacious” Cyber Attack

Three Lessons from the RSA Hack, from a Customer’s Perspective

Foreign Cyber Attack Hits Canadian Government

Guerilla Cyber Warfare: Are We Thinking Defensively?

Written By

For more than 15 years, Mike Lennon has been closely monitoring the threat landscape and analyzing trends in the National Security and enterprise cybersecurity space. In his role at SecurityWeek, he oversees the editorial direction of the publication and is founder and director of several leading cybersecurity industry conferences around the world.

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing for the latest cybersecurity threats, trends, and expert insights.

Click to comment

You must be logged in to post a comment Login

Leave a Reply

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts.

NOW LIVE: CISO Forum 2026 Summit

Join as we bring together CISOs, senior cybersecurity executives, practitioners, industry experts, and other security leaders to share practical experience and examine the issues shaping enterprise cybersecurity strategy.

Register

Join to learn the four levels of architecting security into the agentic SDLC – from securing the code your developers' agents write to running a coordinated system of security agents you've built yourself.

Register

People on the Move

Cohere has appointed Jaya Baloo as CISO.

Jensen Huang has resigned as President and Chief Executive Officer at NVIDIA.

Sean Sweeney has become CIO of the City of Charleston, South Carolina.

More People On The Move

Expert Insights

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing to stay informed on the latest cybersecurity news, threats, and expert insights. Unsubscribe at any time.