There have been interesting developments with exploit kits in the past few months to say the disappearance of some and the birth of others. New kits arent new per se, but rather variants or VIP versions of their predecessors. RIG-v EK is the VIP version of the regular RIG EK which started to appear in early September and showed Neutrino-like patterns. RIG is the underdog that took over from Angler when the latter briefly succeeded to Angler from June to September.”]
Source: https://blog.malwarebytes.com/cybercrime/exploits/2016/11/exploit-kits-fall-2016-review/