# You May Be Mining Cryptocoins For Others Without Even Knowing
The case of the Brazilian version of the website of the manufacturer D-Link makes clear that a new scheme is becoming popular here.
https://images.pexels.com/photos/38275/anonymous-studio-figure-photography-facial-mask-38275.jpeg?w=940&h=650&auto=compress&cs=tinysrgb
<sub><sup>Source: [Pexels](https://www.pexels.com/photo/photo-of-guy-fawkes-mask-with-red-flower-on-top-on-hand-38275/) - Public Domain Image</sup></sub>
Having an online site is always something complicated. A mistake in the setup, and you're vulnerable to intrusion. In some cases the pain may be just headaches, but in others it can hurt a lot, in the pocket.
Last Friday, the website of D-Link showed strange behavior that was noticed by Twitter users. When loaded, the page displayed an error in the script named "cryptonight.wasm". His source address was from the Coinhive site, which offers cryptocoin mining services through the web.

CryptoNight is a mining algorithm used by some currencies based on CryptoNote technology. Among them are AEON , Bytecoin , Fantom and Monero . The last one is exactly the coin that have been mined through the solution offered by Coinhive.
The site gained prominence after the torrent sharing platform, The Pirate Bay, began testing the prospect of mining Monero on its visitors' machines instead of displaying ads like "increase your penis size" and stuff like that.
In addition to The Pirate Bay, fake versions of famous sites like Wikipedia and the soccer player Cristiano Ronaldo's page were also created with the script. When entering pages like these it is possible to notice that the computer is much slower and the CPU processing used by the browser rises considerably.
The report found that the error in the script noticed on the D-link site happened only in the Google Chrome browser and even with the site open, it was not possible to notice any significant changes in the processing of the computer. According to Igor Marcel, information security specialist at Blaze Information Security, this is probably due to an error in the script implementation. As you noted, the message that appears on the console was caused by the "Access-Control-Allow-Origin" header, which caused a failure to load the program. "
He noted that the problem for its implementation is linked to Cross-origin Resource Sharing (CORS) policies, a specification of web servers that define permission for one page to access resources from another server. "The irony is that the error message still suggests the possible solution to fix the problem," he says.
This Tuesday, the Brazilian site of D-link no longer presented the error or the Coinhive script. Asked about the incident, the company informed through its press office that "it has already identified the problem on the site and is working to have it resolved as soon as possible."
## Making Money From Other's Computers
Cases of cryptocurrencies mining attacks have been frequent. In the first half of this year, a researcher identified the use of a new version of the virus used in the Mirai botnet for Bitcoin mining . Last September, Kaspersky published a study in which it pointed out that at least 1.65 million computers are being used to mine cryptocoins to hackers .
"There has been a significant increase in attacks aimed at mining cryptocoins," noted the expert, Igor Marcel, who reported that he had dealt with two such incidents last month. "Curiously, in all the cases we analyzed, the mined cryptocurrency was the Monero."
https://video-images.vice.com/_uncategorized/1507127222146-process.jpeg?resize=1050:*
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False Wikipedia site consuming much of the processing. Credit: [vice](https://www.vice.com/pt_br/article/qvjme5/voce-pode-estar-minerando-criptomoedas-sem-nem-saber)</sub>
Mining cryptocoins is a process of solving extremely complicated mathematical calculations. That is, for your computer to do this, it will need a lot of processing power by its processor or by the video card.
In the case of CryptoNight, it's an algorithm designed to enable mining in ordinary computers by means of a video card. It's not efficient as other algorithms, such that used by Ethereum for example, that go after the power of your CPU.
To find out if you are mining for others, the way to do this is to check if your CPU is working harder than it should. The first sign the computer can give is to stay considerably slower as soon as you open the site. For the avoidance of doubt, the way is to check how much processing. If your browser is consuming a percentage above the average processing of your computer, this is a strong indication that the other's website is making your machine work.
If you need to continue browsing the page that is using your computer without your permission, some of the traditional ad blockers, such as AdBlock , are already adding updates that do not allow the mining script to run. Besides them are starting to appear plugins aimed specifically for this purpose. Among them are NoCoin and MinBlock.
<sup>__Source:__ https://www.vice.com/pt_br/article/qvjme5/voce-pode-estar-minerando-criptomoedas-sem-nem-saber</sup>
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