How to remove Prifass.sys virus

This is a brief article about Prifass.sys deletion. We know everything that you should realize about Trojans: defensive measures, the infection ways and removal strategies. We are going to hook you up with step-by-step uninstalling tips and tell you how to act to never meet Prifass.sys again.


Prifass.sys trojan


Trojan utilities are really dangerous, and usually, when victims call something a virus - it's a Trojan. These dangerous pieces of code are underhand, fast and cross-functional so that they can be applied for practically any illegal purpose that you can imagine. Prifass.sys Trojan also has these features. If you did let it infect your computer, sooner or later it would start to do its work aggressively, and the PC might get injured. On this page, we have made up all info, that might be helpful for you to recognize Prifass.sys and eliminate it. We'll also teach you what Prifass.sys is and the methods through which you might secure the laptop from other suchlike Trojans.

What is Prifass.sys

Prifass.sys is a utility that is capable of doing literally everything. Well, it cannot order you a bucket of chicken, but it is capable of doing a lot of interesting things to your computer. In most cases, it all begins with the theft of sensitive info. That’s the original function, and all Trojans do it all the time. These viruses get into the system, crawl as deep as they can and try to stay there for a long time. The sensitive info ranges from browser history to logins and passes, and it is quite essential for fraudsters. The virus easily saves it and sends to Internet-criminals, without any visible activity. Prifass.sys can remain in this mode for years, but sometimes, it needs to do other things. Here are the very common of them:


  • Cryptocurrency production. In mining, the value of electricity and the wear of computers are the main factors. If you apply someone else's computer, and some other guy pays the bills, it turns into an extremely favorable business. Of course, in case of Trojan-based mining, you are the one who pays for everything, and scammers simply count their money.
  • Attaching the device to a botnet. Botnets are a large net of PC's and smart devices that are working under the guidance of scammers. In most cases, the machines’ users don’t even know that they’re involved in a suchlike activity. Through botnets, fraudsters fulfill DDoS attacks on web pages and distribute spam.
  • Implicating you into doubtful practice. This variant is a disaster for the user: hackers might commit a cyber-crime using your computer. You don't see these things every day, but the users to whom it did happen were not so grateful about it.
  • Download of various viruses. Some of them just aren't capable of getting into the OS independently, so their only hope is Trojans. Prifass.sys weakens the system protection and assists them to get in. And trust us, that will be way worse than adware.


All these scenarios are too bad to ignore them and if a virus performs them – either your laptop, or your budget will face major problems. The best way to evade that is to remove Prifass.sys before Trojan hits the fan.


The Prifass.sys’s main trait is stealthiness. Prifass.sys was designed not to get caught, and if you have detected it somehow – there are two options: either you’re an extremely experienced operator, or something went bad so that the virus needed to show itself. Hackers are brainy enough to get their malware ready to interwork with the highly well-liked programs. Unfortunately for hackers, they're not able to research the full assortment of software, and in some cases Trojans just aren't functioning, if some particular utility is installed in your OS. It calls BSOD's, sudden turn-offs, overall slowdown and fatal errors. Probably that’s how you've understood that the PC is infested and you have to do something to clear it.

How to protect the system against Trojans



To defend the PC from viruses, you only have to do lots of things. You hoped it would be easy, yeah? Unfortunately, not. A suchlike manner of security can’t be obtained for nothing, since it needs not only the decent anti-virus but the change of your behavior in the Web. You need to avoid infected websites, stop downloading pirated content, stop clicking on each link you get and installing software offered via aggressive advertising. These measures will assist you increase your device’s security once and for all.

How to remove Prifass.sys


We're aware of a single true method to uninstall Prifass.sys virus. To achieve the good results, you have to clear the viral files in manual mode and then launch the cleaning via an antiviral utility, to make sure that everything’s good. In the course of the process, you’ll need to enter the safe mode, erase the suspicious entries from the hosts file and uninstall viral files from everywhere. After this paragraph, we've placed the detailed instructions, and you should adhere to them, as errors will bring devastating consequences.

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 the computer with antivirus


Since everything is done, the last thing to do is buy Spyhunter anti-viral program, establish it and scan the computer. We're sure you're wondering why we recommend Spyhunter? Because it’s more reliable, stronger and swifter than the competitor’s tools, and boasts with a fair cost. You can download a limited version of Spyhunter by clicking the link under this section. You may scan your system with its help to try Spyhunter’s strength.


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

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SpyHunter scanner detects threats and malware for free, but to remove infected elements you need to purchase a full version of program. More information about Spyhunter, EULA and Privacy policy.


Step 7. Disable Safe Mode and restart computer

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


Video with trojan virus





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0 #1 AN 2018-05-28 12:09
Thanks for the general tips!

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