Djvu VirusRansomwareRemoval Guide

Vook Virus Removal Guide (+Decrypt .vook files)

Vook Virus – Details

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

Vook was created for the sole function to encrypt all popular file types. Rationally, as soon as the file encryption is successfully accomplished, the users are unable to get access to them. Vook ransomware adds its own “.vook” to all the encrypted files. For instance, the file “price_list.xls”, once modified by Vook, will be entitled as “price_list.xls.vook”. Once the encryption is accomplished, Vook puts its own distinct text file (_readme.txt) into all the folders that keep the encrypted files.

The message mentioned by _readme.txt asking for the random os really similar to the alerts offered by other ransomware hazards coming from the DJVU family. The caution essentially shows that the information has been secured and the only service to get access to it is to use an unique standalone key. Regretfully, this declaration is definitely real.

The approach to encrypt the files utilized by Vook is not entirely researched. However, there is no doubt that each computer system owner may be provided a special decryption key, which is absolutely unique. It is extremely hard to recover the information without the suitable type in place.

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

Don't worry, you can return all your files! virus

One more peculiarity of the Vook ransomware is that the users are not able to get access to the key. The decrypting key is hosted on a special server under the total control by the scoundrels who have actually launched the Vook ransomware into the web. In order to obtain the key and bring back the crucial data, the users are informed to get in touch with the scams via email or by telegram and to pay the ransom in the quantity of $980.

The message likewise states that individuals must get in touch with the Vook authors within 72 hours upon the minute of the information file encryption. The alert suggests that by doing so individuals will obtain a 50% discount, for that reason, the ransom amount drops down to $490.

No matter what the amount of the ransom is, we strongly recommend that you do not pay the ransom. There is no assurance that these online crooks will keep their pledges, so they may not care at all what the victims feel about the file encryption, even when the amount of the ransom is gotten into their accounts. For this reason, paying ransom typically does not lead to a successful recovery. So, the users might simply lose their money for nothing.

Likewise, we advise you not to contact the scams as they advise. Do not move money into their wallets. There are no applications that could crack the Vook ransomware or bring back the information at no cost. Therefore, the only proper choice is to restore the data from possible backups (if available).

Virus Summary

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

Do not forget that the Web is now full of infections similar to the Vook virus. For instance, this specific threat is essentially identical to Brusaf and other ransomware-type infections. These harmful energies have actually been developed in order to encrypt the crucial data and express the need for the users to pay the ransom. All these infections utilize the identical algorithm to generate the particular key for effective data decryption.

Unless the Vook ransomware is still under the advancement procedure or has got some hidden bugs, it is not possible to restore the information by hand. Thus, the only working solution to avoid the loss of your crucial data is to routinely preserve current backups of all your vital documents.

Another essential piece of advice is to save the backups on special storage not connected to your primary device. For example, you may keep it on the USB Flash Drive, or some external hard disk drive, or by using the cloud data storage services. Keeping the backups on your regular drive is really dangerous, because the backup might likewise be encrypted by the Vook .

Leakages for the Vook ransomware attack.

Vook uses numerous paths to infiltrate the susceptible computers. It is not specific what particular technique was utilized in your case, nevertheless, the invasion may occur through the following channels:

  • bundling with third-party programs, generally free software;
  • spam e-mails from the unidentified senders;
  • sites providing complimentary hosting;
  • P2P (peer-to-peer) torrent downloads.

There are times when the Vook ransomware might camouflage itself as some authentic application, for example, through the deceptive alerts demanding setup of some software application update. This is the most common technique used by the frauds to inject the Vook virus files into the system. By doing this users partially take part in its installation, without plainly comprehending the risk.

Additionally, the frauds might send out unsolicited spam e-mail with tricky notifies motivating the people to open suspicious attachments or click some download links, for example, those motivating the people to open certain images, text files, tax documents and other info.

No doubt, opening these files or clicking the malicious links might basically damage the system. Fake Acrobat Reader upgrade notifications may cause the Vook ransomware infiltration. Likewise, downloading the cracked software may in addition include the ransomware installer. The last however not the least, installation of Vook might occur through some Trojan horses that might be set up stealthily into the system and without the user’s direct authorization or perhaps authorization.

Avoiding the Vook ransomware injection.

Of course, there is no outright warranty that your computer will be always free of any malware attacks, however, we wish to share some useful ideas with you to make it much safer. Make certain to pay extremely attention while browsing the web and especially while downloading cost-free programs. Do not open any dubious e-mail attachments, particularly if the sender is not known to you.

Do not forget that certain freeware installer might also consist of some other additional apps in the bundle. These extra applications might be really damaging. It is of utmost significance to keep your anti-virus software application and your os in general to be always correctly upgraded.

It is quite sensible that downloading cracked programs is illegal, nevertheless, furthermore, such unapproved programs usage may likewise bring serious damage to your PC. Thus, do not download any broken programs. Plus, the reality that your current anti-virus did not secure the system from the Vook ransomware is a great factor for you to reevaluate your choices and switch to another program that can render the protecting functions on a much better level.

Below please find the quotation from the Vook 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 “.vook” extension added by the ransomware:”

Vook Ransomware - encrypt files with .vook extension

Use GridinSoft Anti-Malware to remove Vook 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

Use Emsisoft Decryptor for restore vook 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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