In a regulatory filing to the US Securities and Exchange Commission (SEC), the Community Health Systems (CHS) disclosed a massive data breach impacting around 4.5 million people in 29 states.Confirmed by the company in July 2014, the intrusion is believed to have occurred in April and June 2014 and to have been perpetrated by an Advanced Persistent Threat (APT) group based in China.According to forensics expert Mandiant (a FireEye company), who was contracted for the investigatio…
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