In any case, immediately remove all dubious applications/browser plug-ins and ensure that visited sites are legitimate. If you feel that the system suddenly 'lags' without any particular reason, there may be a COINMINER infection or you are visiting dubious websites. Visiting these sites always leads to a reduction in system performance, since most of the resources are used to mine cryptocurrency. In some cases, these sites are legitimate - they are either hijacked by cyber criminals or the hosts are dubious enough to take advantage of unsuspecting users. Cyber criminals inject Coinhive script into various websites. Monero is optimized for CPU mining and JavaScript is capable of making better use of the computer CPU, rather than GPU. Unlike COINMINER, however, Coinhive mines Monero cryptocurrency, rather than Bitcoins. Another way to stealthily mine cryptocurrency is to use JavaScript code called Coinhive. This significantly reduces overall system performance.
In other words, cyber criminals stealthily misuse system resources (specifically, the GPU) to generate revenue without users' consent. Immediately after infiltration, bogus software (so-called COINMINER) starts mining Bitcoins in the background. This method is called "bundling" (potentially unwanted programs are also proliferated in this way). To proliferate COINMINER malware, cyber criminals typically employ fake Flash Player updaters. Cyber criminals also started to partake in this enterprise: to generate revenue, they proliferated malware that stealthily mined cryptocurrency. Therefore, mining cryptocurrency became even more popular.
The price of popular cryptocurrencies jumped dramatically (for example, in early 2017, Bitcoin was equivalent to ~$1000, while at the end of the year it reached nearly $20,000). As most of us are aware, 2017 was a very successful year for cryptocurrency miners.
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