CPU Mining
CPU Mining is the use of a computer’s CPU to perform proof of work mining for a cryptocurrency.
Proof of Work cryptocurrency mining requires a processor to perform calculations called hashes. These calculations can be performed by a regular general purpose Central Processing Unit (CPU) of the kind you will find in any computer, by a slightly more specialized Graphics Processing Unit (GPU), or a highly specialized ASIC chip designed just for performing that type of calculation.
The relative merits of each method will depend on the hashing algorithm used by the digital currency in question.
Usually, CPU mining is the least effective, ASIC mining is the most efficacious, and GPU mining is somewhere in the middle. This is considered to be problematic by some, because the more specialist and expensive the hardware needed for profitable mining becomes, the fewer people get involved in it, leading to mining centralization and therefore a less secure network.
For many people, the ideal situation would be for anybody to be able to join in the process of mining on their home computer and still have a chance of earning block rewards. This increases decentralization and therefore creates a more secure and equitable network.
Because of this, some cryptocurrencies have been deliberately designed to be ASIC-resistant, meaning that it is difficult to gain an advantage in performing the necessary calculations by developing specialist custom processors. Other coins have even sought to minimize or remove any advantage to be gained by the use of high-end GPU chips, which are not fitted as standard to most computers. This latter type is known as CPU mined coins.
How Hackers Mining ???
Hackers coding a special javascript with the website to mine cryptocurrency from visitors CPU.
we found that those services majorly provided by the website called Coinhive.
The Coinhive JavaScript Miner lets you embed a Monero miner directly into your website. The miner itself does not come with a User Interface – it's your responsibility to tell your users what's going on and to provide stats on mined hashes.
Once you visit the hacker website, javascript automatically starts mining by utilizing your PC CPU.
the background process is like the following image.In the image, 100% CPU uses with 408 threads to mine hashes at the speed of 22.3 hashes per second.
Some time this mining possible to crash your CPU as well as your laptop be careful.
Some websites have found using a simple yet effective technique to keep their cryptocurrency mining javascript secretly running in the background even when you close your web browser.
Due to the recent surge in cryptocurrency prices, hackers and even legitimate website administrators are increasingly using JavaScript-based cryptocurrency miners to monetize by levying the CPU power of their visitor's PC to mine Bitcoin or other cryptocurrencies.
After the world's most popular torrent download website, The Pirate Bay, caught secretly using Coinhive, a browser-based cryptocurrency miner service, on its site last month, thousands of other websites also started using the service as an alternative monetization model to banner ads.
How to avoid ???
Use Anti Miner extension in your browser to detect and block the CPU mining scripts.
For Chrome: Anti Miner
For FireFox: No Miner
For Chrome: Anti Miner
For FireFox: No Miner
