nandemoari writes "Recently, the Conficker/Downadup worm infected several hundred machines and critical medical equipment in an undisclosed number of US hospitals. The attacks were not widespread; however, Marcus Sachs, director of the SANS Internet Storm Center, told CNET News that it raises the awareness of what we would do if there were millions of computers infected in hospitals or in critical infrastructure locations. It's not clear how the devices (including heart monitors, MRI machines and PCs) got infected. Infected computers were running Windows NT and Windows 2000 in a local area network (LAN) that wasn't supposed to be Internet accessible, but the LAN was connected to one with direct Internet access. A patch was released by Microsoft last October that fixes the problem, but the computers infected were reportedly too old to be patched."