How do you infiltrate US government computers when security experts are increasingly aware of your hacking campaigns? Send old-fashioned mail, apparently. The Multi-State Information Sharing and Analysis Center has warned officials of a China-based campaign that mails CDs loaded with malware. State institutions have received China-postmarked envelopes containing both discs with virus-laden Word documents as well as nonsensical letters. While it's not clear what the exact intent was, it looks as if the 'hackers' hoped to make their campaign seem more plausible by sending something physical.