There are web services which are making users mine without their knowledge. Recently , thepiratebay was found doing the same.

https://cdn-images-1.medium.com/max/...dHp9cgl_Q.jpeg

CoinHive has made it easy by releasing a javascript library. Just inserting a couple of lines of code will start the mining process. This will cause a spike in cpu usage and increase in temperature of the computer.

There could be other sites doing the same. If you see increase in your CPU activity even when you are not doing any costly computation like image editing or playing video games, there is a possibility your CPU power is being utilised without your knowledge.

This is with respect to browser. But, people can build viruses that can infect the operating system of mobile/laptops to mine without user’s knowledge. This could be the future of viruses.

You can go ahead an ban this URL, to avoid being mined using coin-hive’s library.

https://coin-hive.com/lib/coinhive.min.js

The other alternative is to use a script blocker , since the library name and url can be changed. Hopefully antivirus would deploy a patch that would able to detect such mining viruses soon.