Two intriguing points:
1) A simultaneous attack was performed on the Department of Justice. See http://spectrum.ieee.org/riskfactor/computing/it/thumb_drive_security_peril_at ...this raises the specter that other attacks were occurring at the time and have not been reported. Or, detected [cue ominous music].
2) Shortly after these attacks, China banned Windows from critical government and military computers, moving instead to a version of FreeBSD Unix (familiar as the underpinnings of Mac OS X). http://www.h-online.com/security/China-installs-a-secure-operating-system-on-all-military-PCs—/news/113298
my rather depressing view on this is that if there is ever a hot conflict developing with china, they are going to demonstrate the ability to turn out the lights in the US (and who knows what stuff within our own govt cybernetworks), as well as do who knows what to our financial markets, etc.