It is apparent the increasing prevalence of botnets - networks of compromised computers on the internet - has contributed to a large portion of online crimes since 2005. Under the control of cybercriminals, these networks serve as proxies in the crime commission process and act as an amplifier of criminal activity. These instruments of automation are frequently used for illicit activities by a range of actors from novice criminals aiming to make a quick dollar to highly organised cybercrime gangs. (This article is cross-posted on the October 2013 issue of the VFAC Review.)