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JS/CoinMiner. How to remove? (Uninstall guide)

removal by Ugnius Kiguolis - - | Type: Malware

JS/CoinMiner – a cryptocurrency miner that is waiting for victims on the compromised websites

The image of JS/CoinMiner

JS/CoinMiner is Trojan Horse that is being used for illegal mining cryptocurrency.[1] This dangerous cyber infection can hack websites and soon as a person visits it, malware starts mining digital currency without asking user’s permission.

The first mining scripts used by JS/CoinMiner malware was discovered in September 2017. Miner mostly targets internet users in Russia, Ukraine, and Belarus. As we have already mentioned, the virus lures on websites. Most of the affected sites were streaming video or offered to play games.

When a person visits such site, JS/CoinMiner virus immediately starts using computer’s CPU to mine Monero, Dashcoin, DarkNetCoin or other cryptocurrencies. In order to do so, creators of miner use CryptoNight Mining technique that allows hiding Coinhive JavaScript Mining code into the affected website.

The biggest problem is that users cannot notice the attack. Miner does not require downloading or installing any plugins or updates. Thus, users might not have any clue that their devices are used for illegal cryptocurrency mining.

However, it’s still possible to suspect that you are on the site that includes JS/CoinMiner because malware might reduce browsing speed, make computer sluggish or unresponsive due to the high usage of CPU. You can see the number of computer resources used in the Windows Task Manager.

When running in such conditions for a long time, your computer might overheat. Thus, it may damage your machine. Technically, JS/CoinMiner removal is impossible. However, if you found yourself on the site that drains your computer’s recourses, leave it and do not come back to it ever again.

However, if you still see your computer acting oddly, check Task Manager. You might find some suspicious processes that are draining your CPU and graphics card power. Thus, you have to stop these processes. Additionally, you have to remove JS/CoinMiner or another cryptocurrency miner from your computer immediately. For that, use Reimage.

Protect your self fileless malware attack

JS/CoinMiner starts its malicious activities without needing to install any programs. It might seem like a sophisticated cyber threat that is nearly impossible to avoid. However, you can still protect yourself from the miner.

First of all, you can turn off JavaScript in your browser. This will prevent malicious script from running once you access compromised website. However, this might diminish browsing experience because you be unable to access specific content on web pages.

Secondly, you can install ad-blocking program to your browser which will block malicious ads[2] that hides illegal mining scripts.

Thirdly, you can obtain a reputable antivirus which offers real-time protection, prevents from accessing malicious sites or blocks malicious codes from running.

Security specialists from virusi.hr[3] highly recommends to stay away from adult entertainment sites, shady online gaming, illegal video streaming and similar questionable websites. They are most likely to spread malicious programs.

Stop JS/CoinMiner malware from using your computer’s resources

As we have already mentioned, miner starts its malicious tasks soon as a person visits a compromised website. The currently known version of malware does not require installing any malicious components on the computer, so JS/CoinMiner removal from the device typically is not needed.

To stop miner’s activities, you have to close browser’s tab and leave a compromised website. However, if you find unknown processes in the Task Manager draining your computer’s power, you should get a reputable malware removal software (e.g. Reimage, Malwarebytes Anti Malware) and remove JS/CoinMiner with the help of it.

If this malicious program blocks access to security software, please check the instructions below. Our team will help to disable the virus and run malware removal tools.

 

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What to do if failed?
If you failed to remove infection using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to uninstall JS/CoinMiner. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.
More information about this program can be found in Reimage review.
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Manual JS/CoinMiner Removal Guide:

Remove JS/CoinMiner using Safe Mode with Networking

This method can help you to disable the miner in order to run automatic elimination with security software:

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove JS/CoinMiner

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete JS/CoinMiner removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove JS/CoinMiner using System Restore

If a previous method did not help, follow these steps:

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of JS/CoinMiner. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that JS/CoinMiner removal is performed successfully.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from JS/CoinMiner and other ransomwares, use a reputable anti-spyware, such as Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Malwarebytes Anti Malware

About the author

Ugnius Kiguolis
Ugnius Kiguolis - The mastermind

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References