As reported by Krebs on Security:
The problem first came to light in a post on the DSL Reports Security Forum. DSLR member “Mike” from Pittsburgh got curious about the integrity of a USB drive that the ADA mailed to members to share updated “dental procedure codes” — codes that dental offices use to track procedures for billing and insurance purposes.More information at the link.
“Oh wow the usually inept ADA just sent me new codes,” Mike wrote. “I bet some marketing genius had this wonderful idea instead of making it downloadable. I can’t wait to plug an unknown USB into my computer that has PHI/HIPAA on it…” [link added].
Sure enough, Mike looked at the code inside one of the files on the flash drive and found it tries to open a Web page that has long been tied to malware distribution. The domain is used by crooks to infect visitors with malware that lets the attackers gain full control of the infected Windows computer...
In response to questions from this author, the ADA said the USB media was manufactured in China by a subcontractor of an ADA vendor, and that some 37,000 of the devices have been distributed.