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Js Miner. How to remove? (Uninstall guide)

removal by Gabriel E. Hall - - | Type: Trojans

Js Miner – a legitimate digital currency mining program that is abused by hackers

Js Miner trojan horse

Js Miner is a crypto miner that can be used by website owners to monetize on visitor's computer power (CPU and GPU). It uses JavaScript[1] code to mine Monero whenever users visit the targeted website. Unfortunately, bad actors learned how to misuse coin mining codes and inject them into sites illegally, without letting users know. This can significantly impact anyone infected with a trojan[2] – slowdowns and crashes of the machine are common, as well as overall performance drops dramatically. The malware has multiple versions and mainly spreads via malicious websites.

SUMMARY
Name Js Miner
Type Trojan Horse
Sub-type Crypto-miner
Variants
  • JS:MINER-A
  • JS:MINER-B
  • JS:MINER-C
  • JS:MINER-D
  • JS:MINER-E
  • JS:MINER-F
  • JS:MINER-G
  • JS:MINER-H
  • JS:MINER-I
  • JS/CoinMiner
Symptoms Majorly increased CPU and GPU usage; slowdowns, crashes or freezes of the PC
Distribution Malicious or infected websites, spam emails
Main dangers Can lead to hardware wear and tear, other malware infections, stolen sensitive information
Elimination Download and install Reimage or Malwarebytes Malwarebytes

Unlike legitimate coin miners, JS:Miner virus affects the machine every time it is booted. As soon as the malicious payload is executed on the targeted computer and files dropped into AppData, Temp, Windows and other folders, the virus performs modification of certain settings, as well starts to schedule tasks with administrative rights without your permission. Without a doubt, Js Miner removal is necessary, as prolonged functioning may destroy your computer hardware.

As soon as malware embeds itself onto the machine, it can emit the following symptoms:

  • Highly increased CPU and GPU usage (over 70%);
  • Constant freezes or/and crashes;
  • Software malfunction;
  • Low computer performance, etc.

It is essential to recognize these symptoms and not confuse them with hardware malfunction or computer aging. For that, you should perform computer scan with Reimage, Malwarebytes Malwarebytes or other reputable anti-malware software. It can instantly determine if your machine is infected.

Js Miner trojan – the functionality

The primary interest of cybercriminals is to infect as many computers as possible – connecting all the infected machines into one mining pool.[3] As the number of affected computer increases, so does the generation of the desired cryptocurrency, resulting in more profits to hackers (more tokens are received into same mining wallet in a shorter timeframe). 

In some cases, JS:Miner virus can operate on the targeted machine fileless, and use the browser instead. This increase malware's persistence and allows it to update itself automatically, or even create copies of itself. Thus, it can operate even if you delete JS Miner's main executable manually. That is why security software is so significant – it can detect all the components hiding deep within the system files.

Apart from mining digital currency, malware is also capable of stealing personal information (such as credentials), logging keystrokes, harvesting system, network, and software information, an even taking screenshots of the desktop. Without a doubt, you should remove JS:Miner as soon as you notice anything suspicious, as hackers may steal your money or even identity, as well as destroy the operation of your machine.

Js Miner variants

There many variants of the virus, but the most prominent ones are JS:Miner-C and JS/CoinMiner. So far, security experts detected the following types:

  • JS:MINER-A
  • JS:MINER-B
  • JS:MINER-C
  • JS:MINER-D
  • JS:MINER-E
  • JS:MINER-F
  • JS:MINER-G
  • JS:MINER-H
  • JS:MINER-I
  • JS/CoinMiner

The main goal of all these viruses is to secretly mine cryptocurrecny on the targeted machine. However, some variations have distinctive features.

Js Miner-C malware

JSMiner-C

JSMiner-C is the most popular type that is injected into users machines. Malware utilizes graphics card and central processing unit's power to run the crypto-mining activities. At the time of the operation, the fans on the PC run high, and it can become extremely hot. Unfortunately, it is sometimes impossible to determine the CPU usage as it is not shown in the Task Manager. We suggest users downloading and installing third-party software (Like CPU-Z or Core Temp) which is capable of detailing the workload on each hardware component.

JS/CoinMiner

This version also uses JavaScript to contaminate machines. It is relatively similar to other malware variants, except that it does not display other signs and symptoms, apart from increased CPU and GPU usage. JS/CoinMiner tries to avoid detection for as long as possible and mine crypto silently. Additionally, this variant can enable other viruses to enter computers unnoticed and conceal itself deep within the system. The cure for this cyber threat is anti-malware tools, just as it is the case with other variants.

Various ways trojan horses spread

Trojan horses are the sneaky type of viruses and have multiple distribution methods. One of the most prominent ones is via contaminated spam email attachments. If you are the one who opens every single email thrown at you – beware, you can infect your computer in just a few clicks. Especially if you open files attached to phishing emails, thinking it is legitimate. Please be careful, as cybercrooks use clever social engineering to trick victims and make them click on the contaminated link or malicious .txt, .pdf, .doc or similar file. An example of a phishing email:

Claim Your Tax Refund Online

Dear Taxpayer,

We identified an error in the calculation of your tax from the last payment amounting to $319.95. In order for us to return excess payment, you need to create a e-Refund account after which the funds will be credited to your specific bank account.

Please click “Get Started” below to claim your refund:

Get Started

Always question every email, even if it looks legitimate. In most cases, your email provider will mark suspicious emails as spam, so do not ignore these warnings.

Js Miner phishing example

Additional ways trojans can get into your machine are:

  • via suspicious or hacked websites;
  • file-sharing or torrent sites;
  • repacked or cracked software or any other executables;
  • fraudulent links and malicious ads
  • fake updates, etc.

Get rid of Js Miner using powerful security software

Trojan horses are particularly malicious and often use a complicated code (as we already mentioned, some variants can persist on the system even if the main executable is not present). Thus, trying to remove Js Miner virus manually is not a good idea and should only be performed by individuals with sufficient IT skills. 

Therefore, cybersecurity experts[4] advise users to opt for automatic JS:Miner removal. Merely download Reimage, Malwarebytes Malwarebytes or other reputable anti-malware software, bring it up to date and run a full system scan. As trojans may disable security programs from functioning normally, you should enter Safe Mode with Networking, as explained below.

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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 Miner. 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.
Press mentions on Reimage
Alternate Software
Plumbytes Anti-Malware
We have tested Plumbytes Anti-Malware's efficiency in removing Js Miner (2018-06-05)
Malwarebytes
We have tested Malwarebytes's efficiency in removing Js Miner (2018-06-05)
Hitman Pro
We have tested Hitman Pro's efficiency in removing Js Miner (2018-06-05)
Malwarebytes
We have tested Malwarebytes's efficiency in removing Js Miner (2018-06-05)

To remove Js Miner, follow these steps:

Remove Js Miner using Safe Mode with Networking

To make sure that the virus is not interfering with normal operation of security software, enter Safe Mode with Networking as follows:

  • 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 Miner

    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 Miner removal.

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

Remove Js Miner using System Restore

You can also get rid of Js Miner by using System Restore:

  • 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 Miner. 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 Miner removal is performed successfully.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Js Miner and other ransomwares, use a reputable anti-spyware, such as Reimage, Malwarebytes Malwarebytes or Plumbytes Anti-MalwareNorton Internet Security

About the author

Gabriel E. Hall
Gabriel E. Hall - Passionate web researcher

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References

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