The biggest botnets in 2010 were the TDLBotnetA botnet A botnet run by RudeWarlockMob (15% market share) The biggest ones get updated frequently with revised fraud targets and embrace the latest botnet features. 60% of botnets seen in 2010 didn’t even exist in 2009; only one botnet — Monkif — made it to the top 10 of both years. Today’s top botnet winners are succeeding thanks to a thriving ecosystem of best-of-breed, complementary services.”]
Source: https://www.darkreading.com/attacks-breaches/botnet-victims-increased-654-in-2011