Nosu Virus

The encrypted files may not be the only damage done to you. parasite may still be hiding on your PC. To determine whether you've been infected with ransomware, we recommend downloading SpyHunter.

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Nosu is a piece of malware that seeks to lock your files via encryption. The goal of Nosu is to make you pay a ransom for the decryption of the locked data.

The Nosu Virus will encrypt your files and modify their extension to .nosu

It sure is frustrating and unnerving to see that your files have been locked by a virus of the Ransomware category. However, panicking and losing your cool wouldn’t get you anywhere, and would, for that matter, probably make things even worse. This is why you must stay calm and assess your options before you do anything unwise. 

The Nosu virus

The Nosu virus is a harmful piece of computer software known as Ransomware. The Nosu virus is used as a money-extortion tool – it seals its victims files and demands a payment to make them accessible.

Our job in this article is to help you make the best decision with regard to what to do about the Ransomware cryptovirus infection that you are currently faced with. We assume that the insidious Nosu virus has already placed its encryption on your files, and is currently demanding a ransom from you in exchange for their release. There are several things about this ransom we need to point out here. First of all, the sum required is oftentimes quite high – we are talking about four-digit sums. This is not a small amount of money and oftentimes people can’t afford to make such a payment, especially considering the short deadlines given by the blackmailers. However, even if you do have the ability to pay at a moment’s notice, the question is if you should do it. Usually, the answer to that is a soft no, meaning that it is inadvisable to go for the payment, but if you absolutely must try everything to get your data back, and if you are ready to lose a couple of thousand dollars, then you might as well pay. The reason we say this is simply – you might not get your data restored even after you pay for its release. After all, the people that are blackmailing you are criminals – this ransom payment isn’t a purchasing deal, it is a blackmailing scheme, and it’s not unusual for the hackers to refuse to release their victim’s files even after the payment gets made.

The Nosu file extension

The Nosu file extension is an extension that is placed on your files to keep them locked. The Nosu file extension is unrecognizable to all regular programs.

Now that we have made it clear that paying isn’t really your best option, we must talk about the alternatives. The first important thing to note here is that it’s absolutely essential to get rid of the cryptovirus that’s residing in your computer.  You can use the guide from below and/or the professional anti-malware program in it to make sure the virus gets removed. 

After the infection is dealt with, you will need to find a way to get around the data encryption placed on your files. The best way to do that is to simply restore your files from backups, but many users don’t have that. Nevertheless, you should still check all of your other devices, cloud accounts, and other online accounts for any accidental file backups. 

Another option is to try the suggestions that are in the guide we already told you about. They are in its second section, and we encourage you to give them a try. Sadly, we cannot promise you that they will be effective – their effectiveness is likely to vary from one instance to the other. Still, the potential alternative recovery methods we offer you are free, and it won’t harm you to try them out even if they turn out to be ineffective in your case.


Name Nosu
Type Ransomware
Danger Level High (Ransomware is by far the worst threat you can encounter)
Symptoms A Ransomware might visibly decrease the speed of your computer, and decrease its free HDD space.
Distribution Method Some of the methods include the use of spam letters, clickbait ads, and Trojan backdoors disguised as regular programs.
Data Recovery Tool Currently Unavailable
Detection Tool

Remove Nosu Ransomware


Some of the steps will likely require you to exit the page. Bookmark it for later reference.

Reboot in Safe Mode (use this guide if you don’t know how to do it).



We get asked this a lot, so we are putting it here: Removing parasite manually may take hours and damage your system in the process. We recommend downloading SpyHunter to see if it can detect parasite files for you.

Press CTRL + SHIFT + ESC at the same time and go to the Processes Tab. Try to determine which processes are dangerous. 


Right click on each of them and select Open File Location. Then scan the files with our free online virus scanner:

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Maximum file size: 128MB.

This scanner is free and will always remain free for our website's users. You can find its full-page version at:

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Virus Scanner Result

After you open their folder, end the processes that are infected, then delete their folders. 

Note: If you are sure something is part of the infection – delete it, even if the scanner doesn’t flag it. No anti-virus program can detect all infections.


Hold the Start Key and R –  copy + paste the following and click OK:

notepad %windir%/system32/Drivers/etc/hosts

A new file will open. If you are hacked, there will be a bunch of other IPs connected to you at the bottom. Look at the image below:

hosts_opt (1)

If there are suspicious IPs below “Localhost” – write to us in the comments.

Type msconfig in the search field and hit enter. A window will pop-up:


Go in Startup —> Uncheck entries that have “Unknown” as Manufacturer.

  • Please note that ransomware may even include a fake Manufacturer name to its process. Make sure you check out every process here is legitimate.


To remove parasite on your own, you may have to meddle with system files and registries. If you were to do this, you need to be extremely careful, because you may damage your system.

If you want to avoid the risk, we recommend downloading SpyHunter
a professional malware removal tool.

More information on SpyHunter, steps to uninstallEULAThreat Assessment Criteria, and Privacy Policy.

Type Regedit in the windows search field and press EnterOnce inside, press CTRL and F together and type the virus’s Name. 

Search for the ransomware  in your registries and delete the entries. Be extremely careful –  you can damage your system if you delete entries not related to the ransomware.

Type each of the following in the Windows Search Field:

  1. %AppData%
  2. %LocalAppData%
  3. %ProgramData%
  4. %WinDir%
  5. %Temp%

Delete everything in Temp. The rest just check out for anything recently added. Remember to leave us a comment if you run into any trouble!


How to Decrypt Nosu files

We have a comprehensive (and daily updated) guide on how to decrypt your files. Check it out here.

If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you can always ask us in the comments for help!

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