A few months ago the RIG exploit kit took a hit when its source code was leaked by a disgruntled reseller. RIG 3.0 managed to maintain the exploitation percentage of RIG 2.0, but also increased its number of hits. The top payload delivered is the Tofsee spam bot, representing 70% of all infections. The going rate for spam campaigns is approximately 0.5 USD per 1,000 successfully sent emails. This particular payload was observed in our labs attempting to send approximately 1 million emails per day from a single bot.”]
Source: https://informationsecuritybuzz.com/articles/analysing-the-architecture-of-rig-exploit-kit-3-0/