Botnets are networks of computers that have been compromised by malware. They’re difficult to detect because they are controlled remotely by cybercriminals. Victim computers are often referred to as “bots” or “zombies” because they’re carrying out a cybercriminal’s orders without the victim’s knowledge. In this slideshow, Kindsight Security Labs has identified the most dangerous botnets of 2012 based on their impacts this year.
Related: Tracking the botnets