A senior official at the Department of Defense is talking publicly about a 2008 security breach that he claims compromised classified intelligence networks used by the U.S. military. The revelation came in interviews and an article in the magazine Foreign Affairs. The malware eventually spread to both classified and unclassified computer systems creating what Lynn described as a digital beach head from which classified information could be siphoned from the military to servers controlled by foreign governments. The incident prompted soul searching within the government which, up to that point, had a de-centralized cybersecurity operation that was spread across numerous task forces and geographies.
Source: https://threatpost.com/thumb-drive-attack-2008-compromised-classified-us-networks-082610/74385/