Mitsubishi Electric disclosed a security breach that might have exposed personal and confidential corporate data. According to the company, attackers did not obtain sensitive information about defense contracts. The intrusion took place on June 28, 2019, and the company launched an investigation in September 2019. The delay was attributed to the increased complexity of the investigation caused by the attackers deleting activity logs. The Asahi Shimbun and Nikkei newspapers attribute the cyber attack to a China-linked cyber espionage group tracked as Tick (aka Bronze Butler)”]
Source: https://securityaffairs.co/wordpress/96636/data-breach/mitsubishi-electric-data-breach.html