CoinImp Coin Miner Virus (JavaScript) – How to Remove It and Stop It

CoinImp Coin Miner Virus (JavaScript) – How to Remove It and Stop It

This article has been created in order to explain what is the CoinImp miner malware and how to remove it from your web browser and your computer.

A new JavaScript-based coin miner has been detected to be uploaded on websites and make the website visitors fall victims of cryptojacking. The malware, named CoinImp is based on a JavaScript code which is embedded on the users’ computers, after which it connects to a CoinImp mining pool. As soon as this is done, the miner begins a hashing process where it begins to mine for the cryptocurrency Monero which is as anonymous as it is popular in the cyber-underground. In the event that you notice that you browser is slowing down and if you believe this may be due to a CoinImp script, we recommend that you read the following article to learn how to remove this JavaScript mining malware from your computer.

Threat Summary

TypeJavaScript Cryptocurrency Miner
Short DescriptionUses your CPU and GPU’s power in order to mine for coins from the cryptocurrency Monero.
SymptomsYour computer will start to slow down as a result of your web browser taking a lot of your computer’s resources, due to the script, using it as a mule for mining.
Distribution MethodVia potentially unwanted programs or websites you should not have visited.
Detection Tool See If Your System Has Been Affected by CoinImp


Malware Removal Tool

User ExperienceJoin Our Forum to Discuss CoinImp.

CoinImp Coin Miner – How Did I Get Infected

First of all, you have to understand that the CoinImp Coin Miner is not a file that is on your hard drive. The malware is actually a script which is taking advantage of your Web Browser and this includes all commonly used web browsers, like:

  • Mozilla Firefox.
  • Google Chrome.
  • Microsoft Edge.
  • Internet Explorer.
  • Opera.
  • Safari (Yes, It can happen on MacBooks too).

But do not let the fact that CoinImp is a script on websites fool you that your computer is actually safe – it may just be not. This is because the sole purpose of CoinImp is the following (according to their site):

“Your users will enjoy an ad-free experience when running the script in their browsers while they mine cryptocurrency for you. Unique offer on the market – completely free script for web miners! We do take 1% fee, but we give you this back (and more!) in form of Referral Program! So this is powerful solution for JavaScript mining at effective 0% of your total hash rate!”

So basically, similar to many other miners out there, that are legitimate, but use JavaScript, like the JS:CryptoNight malware, the CoinImp JavaScript code can be used in any way a hacker wants to use it. This includes adding it in Trojans or other viruses that may directly connect you to the mining pool after these viruses have infected your computer or even ad-supported programs that may cause browser redirects to a website that may be legitimate but may also have the mining script added to it’s code in order for it’s providers to make money at your GPU’s expense. So whether or not the CoinImp miner virus is using your web browser or malware to mine for Monero, it is up to professional help to analyze and understand. To learn how to do this yourself, keep reading this article.

CoinImp Coin Miner – How Does It Work?

Once you have been connected to the mining pool of CoinImp, the script begins to use your web browser as a way to tap into your GPU and CPU. You may immediately notice this as your web browser may start to cause your computer to slow down and freeze. This is because the CoinImp miner is already taking up a lot of your CPU and GPU’s resources, as we have detected it to do in the screenshot underneath:

This is a clever strategy for the CoinImp cryptocurrency miner to do, because the malware uses the legitimate web browser’s .exe file, which is not blocked by any antivirus program – really smart.

In reality, what the CoinImp miner does by taking over your CPU and GPU’s power is to establish an active connection with a so-called cryptocurrency mining pool. Such connection lists your computer on the behalf of one wallet, tied to all the affected computers – the hacker’s Monero wallet. From there, things become clearer – the crypto-miner uses the power of many affected computers to perform the so-called hashing algorithm. Such mining pools often work as many miners are connected to one mining pool and they are rewarded based on how much mining power they have. This means that the more computers are affected and linked to one miner wallet (the hacker’s), the more money they will make on unsuspecting users’ processor and video card resources.

And this is not the only danger of having CoinImp on your computer. If the miner is installed as a result of a Trojan horse running on your computer and connecting it by force to the mining pool, you may not notice the virus as a web browser process, but rather a shady .exe running active on your Windows Task Manager. And if malware has indeed infected your PC, there is not a symptom that gives the malware away, only the miner. And this is where the actual danger may be, because besides mining for Monero, a CoinImp miner Trojan may also do more damage than you can possibly imagine:

  • Infect other computers on your network.
  • Download other malware on your PC.
  • Update itself to stay undetected.
  • Log the keystrokes you type on your keyboard.
  • Take screenshots of your screen.
  • Steal files, passwords and financial details from your PC.

This is more than enough for you to take actions towards securing your computer in case it has been affected by the CoinImp miner malware.

Remove CoinImp Miner Malware and Protect Your PC

In order to remove this cryptocurrency miner, a simple blacklisting of a website may not work for you, because your PC may be infected with malware. This is why, to be on the safe side, you should check your web browser for any malicious browser extensions and check your file system for malicious files and also check your Windows Registry editor for malicious registry entries. You can do this either manually by following the manual instructions underneath or automatically by simply downloading an advanced anti malware software which has the capability to fully eradicate any possible presence of CoinImp miner on your computer and make sure that you OS stays safe against future intrusive software and websites.


Ventsislav Krastev

Ventsislav has been covering the latest malware, software and newest tech developments at SensorsTechForum for 3 years now. He started out as a network administrator. Having graduated Marketing as well, Ventsislav also has passion for discovery of new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management and then Network Administration, he found his passion within cybersecrurity and is a strong believer in basic education of every user towards online safety.

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