A hacker group with support from the Chinese government has operated for more than 10 years without being detected, able to compromise information from companies and reporters, according to FireEye. Many of the attacks started with social engineering, with victims unknowingly installing the Mysterious Eagle malware onto PCs - so the hacker group could remotely monitor and control the compromised systems.
The APT30 group has been in operation from 2004 and was able to collect information "about journalists, dissidents and political developments in relation to China targeting government and military organizations, and targeting economic sectors of interest to China's economy."
The Chinese government has long been accused of funding cybercriminal groups aimed at compromising western targets - much of the attention is focused on the US government and companies with US customers.