Japanese defense contractors Pasco and Kobe Steel this week disclosed cyber intrusions they suffered back in 2016 and 2018.
Pasco is Japan’s largest geospatial service provider and Kobe Steel is a major steel manufacturer. The two companies disclosed the breaches after Japan’s Ministry of Defense announced last week that two unnamed contractors, in addition to Mitsubishi Electric and NEC, had been targeted in cyberattacks.
Both companies and the Ministry of Defense said that no classified government information was compromised. Pasco also said it had not found any evidence that personal or business information had been exfiltrated, but in Kobe’s case some files may have been stolen.
Kobe said it first identified unauthorized access to its network in August 2016 and again in June 2017 while it was implementing new security measures. Pasco revealed that it had detected a hacker attack in May 2018.
Mitsubishi Electric reported in January that it discovered a breach in June 2019. The attack impacted both employee and corporate data and resulted in the theft of technical and sales materials, and trade secrets.
It has been reported that the attack on Mitsubishi Electric involved exploitation of a vulnerability in Trend Micro’s OfficeScan product. The flaw, tracked as CVE-2019-18187, has been described as an arbitrary file upload issue that could lead to remote code execution. In an advisory published in October 2019, Trend Micro warned that the vulnerability had been exploited in the wild.
In the case of NEC, the company said last month that the initial intrusion occurred sometime after December 2016, but it was only discovered in July 2017. More evidence of a breach was discovered in July 2018.
NEC said the attackers gained access to tens of thousands of files, but it had found no evidence that information was leaked.
The attacks on Mitsubishi Electric, NEC and Pasco are believed to have been carried out by Chinese hackers.