Kobe Steel: intruders in its network reached 250 files with defense-related and personal data

• In August 2016 the company noticed signs of outside access to its network, removed the malware and began strengthening its security. [1] [3]
• In June 2017, while that work was still under way, it found signs of a new intrusion. [1]
• In October 2017 the Ministry of Defense confirmed that the information possibly taken held none of the secrets it designates. [1] [2]
• On 2020-02-06 the ministry disclosed the case, after Mitsubishi Electric: intruders used an unknown flaw in antivirus servers, personal data and business secrets at risk and NEC: unauthorized access to a server of its defense division, and the company published details. [2] [1] [3]

Some {n:250} files with Defense Ministry-related and personal information were accessed. No leak was confirmed, but one could not be ruled out. The company had received no reports of harm. [3] [1]

The company said it had already completed security improvements based on the government's Cybersecurity Management Guidelines and similar guidance. [1]