Djvu VirusRansomwareRemoval Guide

Jyos Virus Removal Guide (+Decrypt .jyos files)

Jyos – General Info

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

Jyos was developed for the sole purpose to encrypt all popular file types. Rationally, as quickly as the file encryption is successfully achieved, the users are unable to get access to them. Jyos virus adds its own “.jyos” to all the encrypted data. For example, the file “price_list.xls”, as soon as modified by Jyos, will be titled as “price_list.xls.jyos”. As soon as the file encryption is achieved, Jyos puts its own unique text file (_readme.txt) into all the folders that keep the encrypted files.

The alert mentioned by _readme.txt asking for the random os extremely comparable to the alerts given by other ransomware dangers coming from the DJVU family. The warning basically indicates that the files have been encrypted and the only solution to get access to it is to use a distinct standalone key. Regretfully, this statement is definitely true.

The approach to secure the files used by Jyos is not totally looked into. However, there is no doubt that each computer system owner may be issued a special decryption key, which is definitely special. It is extremely difficult to recuperate the information without the suitable type in place.

“Don’t worry, you can return all your files!”, from text file message:

message from Jyos virus

One more peculiarity of the Jyos virus is that the users are not able to get access to the key. The decrypting key is hosted on an unique server under the total control by the scoundrels who have actually introduced the Jyos infection into the internet. In order to obtain the key and bring back the crucial data, the users are informed to contact the scams through e-mail or by telegram and to pay the ransom in the amount of $980.

The message likewise states that the people should get in touch with the Jyos authors within 72 hours upon the minute of the information encryption. The alert shows that by doing so individuals will acquire a 50% discount rate, for that reason, the ransom quantity drops down to $490.

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

Similarly, we urge you not to call the scams as they instruct. Do not transfer money into their wallets. There are no applications that could break the Jyos ransomware or restore the information at no cost. Therefore, the only right decision is to bring back the data from possible backups (if available).

Virus Summary

NameJyos Ransomware
File Extensionjyos
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 .jyos extension to all the files modified by it.
Distribution MethodAdware bundles and software cracks
Similar InfectionsLokas, Besub, Nusar
Jyos Removal Tool   GridinSoft Anti-Malware
Jyos Decryption Tool   Emsisoft Djvu Decryptor

Do not forget that the Internet is now filled with infections comparable to the Jyos virus. For instance, this specific danger is essentially identical to Brusaf and other ransomware-type infections. These destructive utilities have been established in order to encrypt the essential data and express the demand for the users to pay the ransom. All these infections use the identical algorithm to produce the particular key for successful information decryption.

Unless the Jyos ransomware is still under the development procedure or has actually got some concealed bugs, it is not possible to restore the information manually. Thus, the only working option to avoid the loss of your essential data is to frequently keep updated backups of all your essential files.

Another essential piece of advice is to keep the backups on special storage not connected to your primary PC. For instance, you may store it on the USB Flash Drive, or some external disk drive, or by using the cloud data storage services. Keeping the backups on your routine drive is really risky, given that the backup might also be encrypted by the Jyos infection.

Leaks for the Jyos ransomware attack.

Jyos utilizes numerous courses to penetrate the vulnerable computer systems. It is not particular what specific technique was utilized in your case, however, the invasion might take place via the following channels:

  • bundling with third-party programs, generally free software;
  • spam emails from the unknown senders;
  • websites offering complimentary hosting;
  • P2P (peer-to-peer) torrent downloads.

There are times when the Jyos ransomware may camouflage itself as some genuine application, for instance, through the misleading alerts demanding installation of some software application upgrade. This is the most typical trick used by the scams to inject the Jyos virus files into the system. By doing this users partly take part in its installation, without clearly understanding the threat.

Moreover, the scams may send out unsolicited spam e-mail with challenging signals encouraging individuals to open suspicious accessories or click on some download links, for example, those motivating individuals to open particular pictures, text files, tax documents and other information.

No doubt, opening these files or clicking the malicious links might essentially damage the system. Fake Adobe Flash Player update notifications may cause the Jyos ransomware infiltration. Similarly, downloading the split software application might additionally consist of the ransomware installer. The last however not the least, installation of Jyos might occur through some Trojan horses that might be installed stealthily into the system and without the user’s direct permission and even permission.

Preventing the Jyos ransomware attack.

Naturally, there is no outright assurance that your computer will be constantly devoid of any malware attacks, nevertheless, we wish to share some beneficial suggestions with you to make it safer. Make certain to pay really attention while searching the web and specifically while downloading cost-free programs. Do not open any suspicious email attachments, especially if the sender is not understood to you.

Do not forget that certain freeware installer may also include some other additional apps in the bundle. These extra applications might be extremely destructive. It is of utmost significance to keep your anti-virus software and your operating system in basic to be constantly properly upgraded.

It is quite rational that downloading pirated software is illegal, nevertheless, in addition, such unapproved apps usage may also bring serious damage to your PC. For this reason, do not download any cracked programs. Plus, the reality that your existing anti-virus did not secure the system from the Jyos ransomware is a great reason for you to reassess your choices and switch to another program that can render the protecting functions on a far better level.

Below please find the quotation from the Jyos 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 “.jyos” extension added by the virus:”

Jyos Ransomware - encrypt files with .jyos extension

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

1.Download GridinSoft Anti-Malware.

You can download 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

Use Emsisoft Decryptor for restore jyos files

You can download Emsisoft Decryptor by clicking the button below:

  Emsisoft Decryptor

  1. Run the decryptor as an administrator. The license terms will show up, which you have to agree to by clicking the “Yes” button.
  2. Once the license terms are accepted, the primary decryptor user interface opens.
  3. By default, the decryptor will pre-populate the locations to decrypt with the currently connected drives and network drives. Additional locations can be added using the Add” button.
  4. Decryptors typically offer various options depending on the particular malware family. The available options are located in the Options tab and can be enabled or disabled there. You can find a detailed list of the available Options below.
  5. After you have added all the locations you want to decrypt to the list, click the “Decrypt” button to start the decryption process. The screen will switch to a status view, informing you about the current process and decryption status of your files
  6. The decryptor will inform you once the decryption process is finished. If you require the report for your personal records, you can save it by clicking the “Save log” button. You can also copy it straight to your clipboard to paste it into emails or forum posts if you are asked to.
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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. I hope there will be an effective decryption tool for this virus. Because I have a lot of important files need to recover

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