Nosu Virus Removal Guide (+Decrypt .nosu files)

Nosu – General Info

Nosu is a harmful software application working as typical ransomware. Michael Gillespie, the widely known malware researcher, first found this new name in the DJVU ransomware family.

Nosu was created for the sole function to encrypt all popular file types. Logically, as quickly as the file encryption is successfully achieved, the users are not able to get access to them. Nosu ransomware adds its own “.nosu” to all the encrypted files. For instance, the file “price_list.xls”, once crypted by Nosu, will be entitled as “price_list.xls.nosu”. Once the file encryption is accomplished, Nosu puts its own distinct text document (_readme.txt) into all the folders that save the encrypted files.

The message mentioned by document requesting for the random os very comparable to the notices given by other ransomware risks coming from the DJVU family. The caution generally indicates that the files have been encrypted and the only option to get access to it is to use an unique standalone key. Regretfully, this declaration is absolutely true.

The technique to encrypt the files utilized by Nosu is not completely researched. Nevertheless, there is no doubt that each computer owner may be issued a special decryption key, which is absolutely special. It is exceptionally difficult to recuperate the data without the appropriate key in location.

“Don’t worry, you can return all your files!”, from _readme.txt message:

message from Nosu virus

One more peculiarity of the Nosu infection is that the users are unable to get access to the key. The decrypting key is hosted on a special server under the complete control by the criminals who have released the Nosu ransomware into the world wide web. In order to obtain the key and restore the essential data, the users are informed to get in touch with the scams through email or by telegram and to pay the ransom in the amount of $980.

The message likewise says that the people ought to call the Nosu authors within 72 hours upon the minute of the information encryption. The alert indicates that by doing so the people will acquire a 50% discount, therefore, the ransom amount falls to $490.

No matter what the amount of the ransom is, we strongly recommend that you do not pay the ransom. There is no guarantee that these online scoundrels will keep their pledges, so they might not care at all what the victims feel about the encryption, even when the quantity of the ransom is received into their accounts. Thus, paying ransom frequently does not result in a successful healing. So, the users may simply lose their money for absolutely nothing.

Similarly, we urge you not to get in touch with the frauds as they instruct. Do not transfer money into their wallets. There are no applications that might break the Nosu virus or bring back the information at no charge. For that reason, the only appropriate choice is to restore the data from possible backups (if available).

Virus Summary

NameNosu Ransomware
File Extensionnosu
Short DescriptionThe ransomware encrypts all the data stored on your system and requires a ransom to be paid on your part supposedly to recover your important files.
SymptomsFile encryption by the ransomware is performed by means of the AES-256 algorithm (CFB mode) encryption algorithm. Once the encryption is completed, the ransomware adds its special .nosu extension to all the files modified by it.
Distribution MethodAdware bundles and software cracks
Similar InfectionsKodc, Redl, Piny
Removal Tool   GridinSoft Anti-Malware

Do not forget that the Internet is now filled with infections comparable to the Nosu virus. For instance, this particular risk is essentially identical to Brusaf and other ransomware-type infections. These damaging energies have been established in order to encrypt the important data and reveal the demand for the users to pay the ransom. All these infections utilize the identical algorithm to produce the particular key for successful files decryption.

Unless the Nosu ransomware is still under the advancement process or has got some hidden bugs, it is not possible to restore the information by hand. Hence, the only working option to prevent the loss of your crucial data is to regularly keep up-to-date backups of all your important documents.

Another essential piece of suggestions is to store the backups on special storage not connected to your primary PC. For example, you may store it on the USB Flash Drive, or some external hard disk, or by using the cloud data storage services. Keeping the backups on your regular drive is really dangerous, since the backup might also be secured by the Nosu infection.

Leaks for the Nosu ransomware attack.

Nosu utilizes many courses to infiltrate the susceptible computers. It is not certain what specific method was utilized in your case, however, the intrusion may occur via the following channels:

  • bundling with third-party programs, mainly freeware;
  • spam e-mails from the unknown senders;
  • sites offering free hosting;
  • P2P (peer-to-peer) torrent software.

There are times when the Nosu virus might disguise itself as some authentic application, for example, through the deceptive informs requiring installation of some software update. This is the most typical technique utilized by the frauds to inject the Nosu ransomware files into the system. By doing this users partly participate in its setup, without plainly understanding the danger.

Additionally, the frauds might send unsolicited spam email with difficult informs motivating the people to open dubious attachments or click some download links, for instance, those encouraging individuals to open specific pictures, text files, tax documents and other information.

No doubt, opening these files or clicking the harmful links may essentially damage the system. Fake Adobe Flash Player upgrade notices may cause the Nosu ransomware infiltration. Similarly, downloading the cracked software application may in addition include the ransomware installer. The last but not the least, installation of Nosu might occur through some Trojan horses that may be set up stealthily into the system and without the user’s direct permission or perhaps permission.

Avoiding the Nosu ransom virus attack.

Obviously, there is no outright guarantee that your computer system will be always without any malware attacks, nevertheless, we wish to share some beneficial tips with you to make it much safer. Make sure to pay extremely close attention while searching the web and specifically while downloading cost-free programs. Do not open any suspicious e-mail attachments, particularly if the sender is not understood to you.

Do not forget that specific freeware installer may likewise contain some other extra apps in the bundle. These extra applications might be really damaging. It is of utmost value to keep your anti-virus software and your os in general to be always appropriately updated.

It is quite rational that downloading pirated programs is unlawful, nevertheless, in addition, such unapproved software application usage may also bring serious damage to your PC. For this reason, do not download any broken programs. Plus, the truth that your current anti-virus did not secure the system from the Nosu ransomware is an excellent reason for you to reevaluate your options and change to another program that can render the securing functions on a better level.

Below please find the quotation from the Nosu text file:

 Don't worry, you can return all your files!
 All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key.
 The only method of recovering files is to purchase decrypt tool and unique key for you.
 This software will decrypt all your encrypted files.
 What guarantees you have?
 You can send one of your encrypted file from your PC and we decrypt it for free.
 But we can decrypt only 1 file for free. File must not contain valuable information.
 You can get and look video overview decrypt tool:
 Price of private key and decrypt software is $980.
 Discount 50% available if you contact us first 72 hours, that's price for you is $490.
 Please note that you'll never restore your data without payment.
 Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours.
 To get this software you need write on our e-mail:
 Reserve e-mail address to contact us: 

 Our Telegram account:

Screenshot of files with “.nosu” extension added by the virus:”

Nosu Ransomware - encrypt files with .nosu extension

Use GridinSoft Anti-Malware to remove Nosu ransomware from your computer

1.Download GridinSoft Anti-Malware.

You can get GridinSoft Anti-Malware by clicking the button below:

  GridinSoft Anti-Malware

2. Double-click on the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-ag.exe file to install GridinSoft Anti-Malware on your computer.
GridinSoft Anti-Malware
An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.
GridinSoft Anti-Malware Setup

3. Press Install button for run GridinSoft Anti-Malware.

GridinSoft Anti-Malware Install

3.Once installed, GridinSoft Anti-Malware will automatically run.

GridinSoft Anti-Malware  Start

4. Wait for the GridinSoft Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your computer for Win Speedup 2018 and other malicious programs. This process can take a 20-30 minutes, so we suggest you periodically check on the status of the scan process.
GridinSoft Anti-Malware Scan

5. Click on “Clean Now”.

When the scan has completed, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.
GridinSoft Anti-Malware Scan Result

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About Daniel Zimmermann

Daniel Zimmermann has been writing on security and malware subjects for many years and has been working in the security industry for over 10 years. Daniel was educated at the Saarland University in Saarbrücken, Germany and currently lives in New York.

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One comment

  1. Hello. Saludos desde Argentina. I have the exact same problem you describe here. I’ve been attacked by this Dvju Ransomware, and it has encrypted lots of my files. My question is, how can I fix them, or maybe when I’ll be able to fix them? I should wait for this key to be found? Another thing: I have just downloaded the Gridin-Soft Anti Malware, and it doesn’t run.. I’m desperate here.. thanks

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