Japanese manufacturer Mitsubishi Electric has acknowledged its discovery last June of a data breach perpetrated by an unauthorized third party that accessed both personal employee information and corporate materials.

The public disclosure came amid multiple English and Japanese news sources publishing details on the incident [1, 2, 3, 4, 5], which experts believe may be the work of the Tick hacking group, also known as the suspected Chinese cyber espionage actor Bronze Butler.

According to reports, the malicious actor was privy to data corresponding to more than 8,000 current and former employees, as well as various job-seekers who applied for a position between 2011 and April 2020. This reportedly includes results from a 2012 survey about a human resources system, and data on 1,569 retirees who received severance pay sometime between between 2007 and 2019.

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