Michinori Holdings: attackers got into part of its network and some server files became temporarily unusable, with no sign of data leaving

A system failure occurred on some servers. [1]

It confirmed that it might have been hit by a cyberattack. [1]

It announced the incident. Employee and supplier information might have leaked, but it had not confirmed any actual leak. [1] [3]

It announced that an outside investigation was complete. No clear trace or technical evidence of data leaving was found, and the view was that this was not a targeted attack. Data had been restored from backups. [2]