Microsoft, working with others in the financial services and computer security industry, has disrupted a number of botnets being used by the Zeus malware family.
The company claims that botnets using ZeuS, SpyEye and Ice-IX variants of the ZeuS family of malware are responsible for nearly half a billion dollars in damages.
See:
http://nakedsecurity.sophos.com/2012/03/26/microsoft-zeus-botnet/
