Deep inside a Chinese military engineering institute in September 2008, a researcher took a break from his duties and decided — against official policy — to check his private e-mail messages. Among the new arrivals was an electronic holiday greeting card that purported to be from a state defense office.The researcher clicked on the card to open it. Within minutes, secretly implanted computer code enabled an unnamed foreign intelligence agency to tap into the databases of the institute in the city of Luoyang in central China and spirit away top-secret information on Chinese submarines.
http://www.nytimes.com/2010/02/12/world/asia/12cyberchina.html