Police arrested Dutch man with Bitcoin mining farm for money laundering

All heavy duty mining nowadays is done by ASICs, even high end dedicated GPU farms can't compete, letalone the kind of machines likely to fall victim to a botnet. If someone did try to hijack those ASICs, you can bet the people running the mining business would notice, assuming it were even possible.

It's interesting how this might apply to an altcoin that actually manages to crack the problem of CPU only mining that a few have tried, however. This particular niche will always have this as a potential problem going forward.