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JS:Cryptonight virus. How to remove? (Uninstall guide)

removal by Lucia Danes - - | Type: Malware

JS:Cryptonight – cryptocurrency miner that targets Mac and Windows users

JS:Cryptonight virus mines Monero

JS:Cryptonight is a trojan horse that used to mine Monero cryptocurrency. The unique feature of malware is that it can affect both Windows and Mac operating systems. The trojan might enter the system unnoticed and immediately start using GPU and CPU of the affected device for illegal cryptocurrency mining.

Summary
Name JS:Cryptonight
Type Trojan (cryptocurrency miner)
Danger Level HighMedium. Makes system changes, uses computer's CPU and GPU in extreme conditions.
Symptoms Sluggish computer's performance, unknown processes running in the Task Manager
Distirbution methods Bogus downloads, corrupted websites

JS:Cryptonight virus might enter the system after visiting a questionable website, for instance, illegal video streaming or web game sites. If you have antivirus installed on your PC, it is supposed to warn you about such activity. Additionally, illegal cryptocurrency mining should stop once you close this website.

JS:Cryptonight trojan might also get into the system pretending to be a legitimate program or its update. Hence, the miner might be installed after downloading freeware or shareware. In this case, the malicious program might make system changes and immediately starts using computer’s resources to mine cryptocurrency.

The miner runs on a Javascript algorithm called Cryptonight.[1] It is specially designed to mine Monero cryptocurrency which gains more and more popularity.[2] You can suspect that it was installed on your Mac or Windows computer if you see suspicious processes running in the Task Manager and notice sluggish computer’s performance.

In this case, you should not try to remove JS:Cryptonight manually. Malware might consist of numerous different files which have to be erased as well. Additionally, other malicious programs may have been installed on your device too.

For this reason, it’s recommended opting for automatic JS:Cryptonight removal which requires scanning the system with anti-malware tool, like Reimage. This task should not be delayed. Malware might not only damage your computer but privacy at risk. Such cyber threats have unlimited abilities.

Infiltration of cryptocurrency miner

The trojan horse might enter the system using a couple of methods. However, each of them requires user’s participation. Typically, malware is advertised as useful program or software update. Hence, users might install it themselves.

Usually, such programs are available on unauthorized file-sharing websites, P2P networks, torrents and similar questionable sources. For this reason, users are advised to stay away from such places. If you need a particular program, you should rely on developer’s websites only.

Additionally, experts from LosVirus.es[3] remind that it’s important to pay attention to software installation process too. If you decide to install freeware or shareware, you need to use Advanced/Custom settings and opt out all pre-selected optional programs. Usually, they have more negative features than are beneficial to the user.

Keep in mind that Quick/Recommended settings do reveal what is hiding in the software bundle. Hence, if you use them, you give indirect permission to install all third-party applications without even knowing it.

Delete JS:Cryptonight virus from the machine

To remove JS:Cryptonight correctly, you have to use powerful security software, such as Reimage or Malwarebytes Anti Malware. It doesn’t matter whether malware infected Mac or Windows device, automatic removal is the only safe method to remove cryptocurrency miner.

Manual JS:Cryptonight removal might not be effective. The miner might come back and continue its activities once you reboot the computer. Additionally, you might accidentally terminate legitimate system files which may lead to irreparable damage to the system.

We might be affiliated with any product we recommend on the site. Full disclosure in our Agreement of Use. By Downloading any provided Anti-spyware software to remove JS:Cryptonight virus you agree to our privacy policy and agreement of use.
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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:Cryptonight virus. 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:Cryptonight virus Removal Guide:

Remove JS:Cryptonight using Safe Mode with Networking

If JS:Cryptonight blocks access to security software, follow these steps:

  • 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:Cryptonight

    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:Cryptonight removal.

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

Remove JS:Cryptonight using System Restore

This method might also help to get rid of the Trojan:

  • 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:Cryptonight. 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:Cryptonight removal is performed successfully.

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

About the author

Lucia Danes
Lucia Danes - Virus researcher

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References