The Netherlands took third place with 154 servers, followed by Russia with 125, Germany with 95, and Korea with 81. Among the Top 10, Canada fared the best with only 38 servers listed.
A botnet describes a group of computers that have been compromised by malware. As such, these computers, or zombies, can be controlled by cybercriminals to send out spam, viruses, and even distributed denial-of-service attacks to other computers. The criminals use command and control, or C&C, servers to issue commands to the unsuspecting computers in the botnet.