They already do: "I operate a ~10k botnet using a ZeuS software I modified myself, including IRC, DDoS and bitcoin mining (13GH/s - 20GH/s atm)." - reddit IAmA

They already do: "I operate a ~10k botnet using a ZeuS software I modified myself, including IRC, DDoS and bitcoin mining (13GH/s - 20GH/s atm)." - reddit IAmA http://www.reddit.com/r/IAmA/comments/sq7cy/iama_a_malware_coder_and_botnet_operator_ama/ http://www.reddit.com/r/IAmA/comments/sq7cy/iama_a_malware_c... http://news.ycombinator.com/item?id=3960034 http://news.ycombinator.com/item?id=3960034