A virus named Qakbot which has been discovered in 2009 (!!) and which recently infected some 1500 US government computers and 1100 British National Healthcare computers turns out to be stealing 250MB in password information per single day.
Qakbot spreads itself through drive-by downloads, shared network drives and USB sticks. It steals keypresses, POP passwords, FTP passwords, certificates and e-Banking sessions keys. The stolen information (like for example certificates) is also being used to make the virus look more legitimate. Recently a sharp increase in the number of infected PC’s has been observed by Symantec.