Put it this way: once you factored in the price of the bus fare to get to the public library to borrow a terminal to check your giant botnet's bitcoin earnings, your criminal enterprise would be operating at a loss.
CPU mining hasn't been viable since 2011 when bitcoin difficulty was below 1,000,000, and today it's near 600,000,000,000.
It makes very little sense to mine on anything other than ASICs.