THREAT REMOVAL

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

Name CoinImp
Type JavaScript Cryptocurrency Miner
Short Description Uses your CPU and GPU’s power in order to mine for coins from the cryptocurrency Monero.
Symptoms Your 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 Method Via potentially unwanted programs or websites you should not have visited.
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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.

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Ventsislav Krastev

Ventsislav is a cybersecurity expert at SensorsTechForum since 2015. He has been researching, covering, helping victims with the latest malware infections plus testing and reviewing software and the newest tech developments. Having graduated Marketing as well, Ventsislav also has passion for learning new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management, Network Administration and Computer Administration of System Applications, he found his true calling within the cybersecrurity industry and is a strong believer in the education of every user towards online safety and security.

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Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer

How to Remove CoinImp from Windows.


Step 1: Boot Your PC In Safe Mode to isolate and remove CoinImp

OFFER

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter

Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows key() + R


2. The "Run" Window will appear. In it, type "msconfig" and click OK.


3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".
Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.


4. When prompted, click on "Restart" to go into Safe Mode.


5. You can recognise Safe Mode by the words written on the corners of your screen.


Step 2: Uninstall CoinImp and related software from Windows

Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:


1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.


2. In the field type in "appwiz.cpl" and press ENTER.


3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"
Follow the instructions above and you will successfully uninstall most programs.


Step 3: Clean any registries, created by CoinImp on your computer.

The usually targeted registries of Windows machines are the following:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

You can access them by opening the Windows registry editor and deleting any values, created by CoinImp there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.


2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.


3. You can remove the value of the virus by right-clicking on it and removing it.
Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.

IMPORTANT!
Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.

Step 4: Scan for CoinImp with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.


It is recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.


2. After you have installed SpyHunter, wait for it to update automatically.

SpyHunter5-update-2018


3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.

SpyHunter5-Free-Scan-2018


4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.

SpyHunter-5-Free-Scan-Next-2018

If any threats have been removed, it is highly recommended to restart your PC.


Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer

Get rid of CoinImp from Mac OS X.


Step 1: Uninstall CoinImp and remove related files and objects

OFFER
Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your Mac with SpyHunter for Mac
Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy


1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:


2. Find Activity Monitor and double-click it:


3. In the Activity Monitor look for any suspicious processes, belonging or related to CoinImp:

Tip: To quit a process completely, choose the “Force Quit” option.


4. Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.


5. In the Applications menu, look for any suspicious app or an app with a name, similar or identical to CoinImp. If you find it, right-click on the app and select “Move to Trash”.


6: Select Accounts, after which click on the Login Items preference. Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to CoinImp. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.


7: Remove any left-over files that might be related to this threat manually by following the sub-steps below:

  • Go to Finder.
  • In the search bar type the name of the app that you want to remove.
  • Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
  • If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.

In case you cannot remove CoinImp via Step 1 above:

In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as CoinImp. If you believe there is no such file, do not delete anything.

You can repeat the same procedure with the following other Library directories:

→ ~/Library/LaunchAgents
/Library/LaunchDaemons

Tip: ~ is there on purpose, because it leads to more LaunchAgents.


Step 2: Scan for and remove malware from your Mac

When you are facing problems on your Mac as a result of unwanted scripts, programs and malware, the recommended way of eliminating the threat is by using an anti-malware program. Combo Cleaner offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.



Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer


Remove CoinImp from Google Chrome.


Step 1: Start Google Chrome and open the drop menu


Step 2: Move the cursor over "Tools" and then from the extended menu choose "Extensions"


Step 3: From the opened "Extensions" menu locate the unwanted extension and click on its "Remove" button.


Step 4: After the extension is removed, restart Google Chrome by closing it from the red "X" button at the top right corner and start it again.


Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer


Erase CoinImp from Mozilla Firefox.

Step 1: Start Mozilla Firefox. Open the menu window


Step 2: Select the "Add-ons" icon from the menu.


Step 3: Select the unwanted extension and click "Remove"


Step 4: After the extension is removed, restart Mozilla Firefox by closing it from the red "X" button at the top right corner and start it again.



Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer


Uninstall CoinImp from Microsoft Edge.


Step 1: Start Edge browser.


Step 2: Open the drop menu by clicking on the icon at the top right corner.


Step 3: From the drop menu select "Extensions".


Step 4: Choose the suspected malicious extension you want to remove and then click on the gear icon.


Step 5: Remove the malicious extension by scrolling down and then clicking on Uninstall.



Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer


Remove CoinImp from Safari.


Step 1: Start the Safari app.


Step 2: After hovering your mouse cursor to the top of the screen, click on the Safari text to open its drop down menu.


Step 3: From the menu, click on "Preferences".

stf-safari preferences


Step 4: After that, select the 'Extensions' Tab.

stf-safari-extensions


Step 5: Click once on the extension you want to remove.


Step 6: Click 'Uninstall'.

stf-safari uninstall

A pop-up window will appear asking for confirmation to uninstall the extension. Select 'Uninstall' again, and the CoinImp will be removed.


How to Reset Safari
IMPORTANT: Before resetting Safari make sure you back up all your saved passwords within the browser in case you forget them.

Start Safari and then click on the gear leaver icon.

Click the Reset Safari button and you will reset the browser.


Windows Mac OS X Google Chrome Mozilla Firefox Microsoft Edge Safari Internet Explorer


Eliminate CoinImp from Internet Explorer.


Step 1: Start Internet Explorer.


Step 2: Click on the gear icon labeled 'Tools' to open the drop menu and select 'Manage Add-ons'


Step 3: In the 'Manage Add-ons' window.


Step 4: Select the extension you want to remove and then click 'Disable'. A pop-up window will appear to inform you that you are about to disable the selected extension, and some more add-ons might be disabled as well. Leave all the boxes checked, and click 'Disable'.


Step 5: After the unwanted extension has been removed, restart Internet Explorer by closing it from the red 'X' button located at the top right corner and start it again.


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