Microsoft has published evidence of an extraordinary conspiracy in which potent botnet malware was apparently installed and hidden on PCs during their manufacture in China.
In ‘Operation B70’ started in August 2011, Microsoft documents how its Digital Crimes Unit (DCU) bought 20 brand new laptops and desktop PCs from various cities in China, finding that four were infected with pre-installed backdoor malware, including one with a known rootkit called ‘Nitol’.
http://news.techworld.com/security/3381302/microsoft-discovers-chinese-malware-pre-installed-on-new-pcs/