Kobe Steel Ltd. and satellite data provider Pasco Corp. have come under cyberattacks in the latest in a series of confirmed cases targeting defense-related companies in Japan, the Defense Ministry has said.

No leakage of classified information has been confirmed from either of the two companies, the ministry said Thursday.

Kobe Steel and Pasco both found that some of their intracompany network terminals were infected with a computer virus, thought to have been introduced through unauthorized external access to the systems in August 2016 and May 2018, respectively, according to the ministry.