Its virtual currency of choice? Monero, a privacy-focused coin. Monero has been involved in several attempts by hackers to hijack a person's computer to mine cryptocurrency without permission, a process known as "crypto-jacking." Monero is liked by some crypto enthusiasts for its anonymity. Unlike bitcoin, the world's best-known cryptocurrency, when monero funds are transferred to a digital wallet address, they are in actuality sent to a randomly created address. This means that no one can know whether those funds were received by the recipient.

https://www.cnbc.com/2018/02/14/salon-disable-ad-blocker-or-let-us-mine-cryptocurrency-monero.html