"Clampi", the Trojan

via DarkReading:

In "one of the largest and most professional thieving operations on the Internet," a Trojan called Clampi (also known as Ligats, llomo, or Rscan) has spread across Microsoft networks in a worm-like fashion, and may already have infected hundreds of thousands of corporate and home PC users, according to SecureWorks researcher Joe Stewart, one of the world's foremost authorities on botnets and targeted attacks. "We weren't all that worried about Storm, and we weren't all that worried about Conficker," Stewart says. "This one you need to worry about."

in Clampi/Ligats/Ilomo Trojan: One of the largest and most professional thieving operations on the Internet.