Data from Kaspersky Labs shows that the number of cryptocurrency mining trojan infections in 2017 has passed 1.65 million to date. Criminals use infected PCs to crunch transactions and route the success fee to their own digital wallets.
https://www.notebookcheck.net/Cryptocurrency-mining-malware-has-infected-over-1-65-million-computers-this-year.248264.0.html