How to remove JS:Cryptonight

How do I uninstall JS:Cryptonight from the device? What is JS:Cryptonight and how did it infest my PC? What is the aim of Trojan viruses and what you can do to protect the computer? On this page we'll answer all these questions and provide simple and safe tips for eliminating Trojan viruses from all versions of Windows OS.

Video with trojan virus sample



JS:Cryptonight is a Trojan that easily got into your system with your help, and was installed with unaware of it. This software can call failures in the system, and we strongly advise you to remove it immediately after reading this guide. The wisest way to prevent the viral infestation is to understand how to distinguish viruses. Here is the short description of Trojan viruses, of their abilities, pros and cons. Trojans are the particular type of viruses that is known for secrecy and multitasking, but is unable to solely penetrate victim's system. In fact, Trojans are not really the viruses, since viruses can reproduce and independently distribute themselves. Trojans rely on people entirely, at all stages of their existence. The first host of young Trojan is its owner who gives it a guise of a helpful program and puts it on homely file-sharing service. The place of Trojan's next host is free, and if you like these cute programs - just install as many suspicious programs as you can, and in a little time you'll get one. One more important thing about Trojans is that most of the times they are being distributed with help of bundling, which means that they infest the computer in one bundle with three or four other viruses.

In spite of many restrictions in the methods of distribution, Trojan programs are very efficient after the penetration through system's defense. Trojans are the biggest type of viruses, and may scrounge your passwords, cause lots of problems with the PC or include your computer in a criminal scam. Here is a brief list of average ways to use Trojan viruses:

  • Trojans, because of their stealthiness, are almost perfect utilities for espionage. Trojan software can live in infested PC for a long time, collecting information against its owner, attended websites, passwords, accounts and in general the text entered through keyboard.
  • The less effective manner of using Trojans is to create botnets. Botnet is a network of hundreds or even thousands of computers, or some other "intelligent" devices, through which swindlers are performing their smelly schemes. With the assistance of suchlike webs they attack big web-pages, distribute lots of viral e-mails and use their computing potential for other purposes, like crypto-currency farming.

All these ways of applying Trojan viruses can be carried out separately or at the same time. Except written in the previous paragraphs major purposes, which directly give profit to fraudsters, Trojans also have side effects: they exploit your computer's recourses, choke the system with undesired software and prevent the workstation from being used for its initial purpose. Being aware of this, you will completely endorse our opinion and eliminate JS:Cryptonight for good.

Removal instruction

Step 1. Boot the system into safe mode

  • Press Start
  • Type Msconfig and press Enter

Safe mode. Step 1


  • Select Boot tab

Safe mode. Step 2



  • Select Safe boot and press Ok

More information about Safe mode: What is Safe Mode and how to boot computer in Safe Mode


Step 2. Show all hidden files and folders

  • Press Start
  • Click on Control Panel

Show hidden files. Step 1


  • Select Appearance and Personalization

Show hidden files. Step 2


  • Click on Folder Options
  • Select View tab
  • Select Show hidden files, folders and drives

Show hidden files. Step 3


  • Press Ok


Step 3. Remove virus files


Check next folders to find suspicious files:

  • %TEMP%
  • %ProgramData%


Step 4. Fix hosts file

  • Go to %SystemRoot%\System32\drivers\etc\ folder



  • Open hosts file using Notepad or other text editor
  • Delete suspicious elements
  • Basic hosts file looks like this:



Step 5. Clean registry (for experienced users)

  • Click Start
  • Type Regedit.exe and press Enter
  • Clean startup registry keys
  • HKEY_LOCAL_MACHINE(HKEY_CURRENT_USER)\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE(HKEY_CURRENT_USER)\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_LOCAL_MACHINE(HKEY_CURRENT_USER)\Software\Microsoft\Windows\CurrentVersion\RunServices
  • HKEY_LOCAL_MACHINE(HKEY_CURRENT_USER)\Software\Microsoft\Windows\CurrentVersion\RunServicesOnce
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit

Step 6. Scan computer with antivirus


We suggest you a simple and efficient manner to eliminate Trojans via Spyhunter antiviral tool. This software can clear the machine of all installed viruses on it, but also guard it from other suchlike problems. Spyhunter works in automatic mode, and for removal you'll simply have to purchase antivirus, set it up and start the scanning and deletion processes. We prefer this method, because it's difficult for an ordinary customer to find the Trojan folders. By eliminating the system folder, you can easily disrupt the computer, and provoke its fatal error. If you're not certain about Spyhunter, you should check the program in action by getting a trial version with limited capabilities.


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It protects the system against all kinds of threats: Trojans, adware and hijackers

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Step 7. Disable Safe Mode and restart computer

  • Press Start
  • Type Msconfig and press Enter
  • Select Boot tab
  • Remove the check near Safe boot





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