Djvuu Ransomware — How to Remove Ii + Decrypt Files
THREAT REMOVAL

Djvuu Ransomware — How to Remove It + Decrypt Files

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This article will help you remove Djvuu Ransomware totally. Follow the ransomware removal instructions provided at the end of the article.

Djvuu is the name of a virus that encrypts your files, while appending the .djvuu extension to each file. Files are locked with both AES and RSA 1024-bit military grade encryption algorithms. The Djvuu cryptovirus will encrypt your data and when finished, it will demand money as a ransom to allegedly get your files restored. Keep on reading the article to see how you could try to potentially recover some of your files.

Threat Summary

NameDjvuu Ransomware
TypeRansomware, Cryptovirus
Short DescriptionThe ransomware encrypts files on your computer machine and demands a ransom to be paid to allegedly recover them.
SymptomsThe ransomware will encrypt your files with the help of the AES and RSA encryption algorithms. All locked files will have the .Djvuu extension appended to them.
Distribution MethodSpam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by Djvuu Ransomware

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Malware Removal Tool

User ExperienceJoin Our Forum to Discuss Djvuu Ransomware.
Data Recovery ToolWindows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

Djvuu Ransomware – Decryptor Released

Recently a series of new STOP ransomware variants have been released in active attack campaigns. As revealed by security experts, the main difference between newly discovered strains is the extension they use to mark corrupted files. Here you could see a list of all other extensions that testify for infection with a strain of STOP ransomware:

Happily, security experts have managed to crack the code of almost all variants of this ransomware family and released a decryption tool. So at this point only victims of .puma, .pumax and .pumas, .djvu, .djvuq, .Djvuu, .djvut, .djvuu, .pdff, .tfude, .tfudeq, .tro, .udjvu, .tfudet STOP ransomware versions are able to decrypt their files with the help of the decryption tool created by the security researchers AfshinZlfgh and Michael Gillespie.

In case that you are victim of one of these versions you can download it via the Decryption Tool link. The tool requires a pair of an original file and its encrypted version.

Djvuu Ransomware – Distribution Ways

The Djvuu ransomware can be acquired by interacting with a malicious element from the Internet or another source. The most popular tactics for spreading these samples include the following:

  • Email Phishing Campaigns — The criminals can coordinate large-scale campaigns by impersonating well-known products, services and companies by copying their emails. The body contents can contain links to the virus files or they can be attached directly to the emails. Computer users will need to carefully check every single message that requires some kind of interaction.
  • Malicious Sites — An alternative is the creation of hacker-made web sites that are copycat imitations of legitimate download portals, product pages and other commonly accessed sites. Interaction with any of them can lead to the Djvuu ransomware infection. The pages typically include a combination of similar domain names and security certificates to make them appear as legitimate.
  • File-Sharing Networks — Many virus samples are uploaded to peer-to-peer networks like BitTorrent. They can be spread independently or through any of the popular payload carriers.
  • Malware Documents — The criminals can embed the necessary virus infection code into documents of all popular types: spreadsheets, presentations, databases and text documents. When they are run by the victims a prompt will appear asking them to enable the built-in scripts (macros) to “correctly view” the document. This will trigger the commands leading to the infection.
  • Application Installers — The criminals can obtain installers of popular applications and modify them with the relevant Djvuu ransomware code. Often applications that are downloaded by the average end users are chosen by the hackers: system utilities, creativity suites, productivity applications and etc.

Large-scale distribution attempts can be done by including the relevant instructions in browser hijackers. They are malicious web browser plugins which are uploaded to the relevant repositories of the browsers with fake user reviews and developer credentials. Their descriptions will advertise feature additions or performance optimizations just to get the users into downloading and installing the dangerous code.

Djvuu Ransomware – In-Depth Overview

The Djvuu ransomware as an example of the STOP ransomware family can be configured to cause a large variety of actions depending on the exact configuration file. Based on analysis of the prior samples we can assume that the first commands will be related to information gathering — the relevant engine can acquire data both about the individual user and the machine itself. This potentially allows the criminals to hijack sensitive data about the users — the engine can retrieve information about their name, address, location and even any stored account credentials. The retrieved information about the machine includes a report of the installed hardware components which is used to assign an unique infection ID.

The gathered information sets can be used further to carry out a security bypass and persistent infection installation. Using the acquired data the Djvuu ransomware engine will scan for the presence of any security software that can block the correct virus execution. Such include anti-virus engines, firewalls, intrusion detection systems, debug environments and virtual machine hosts. As soon as this is done the Djvuu ransomware will be able to take over control of the affected computer. This will make it possible for it to access system settings, WIndows REgistry values and boot options. The made changes will make the virus difficult to remove with manual user guides as it will automatically start each time the computer is run.

If configured so the Windows Registry modifications will take place by modifying both values belonging to the operating system and those that are used by individual applications. If the system ones are modified then certain services can stop working altogether and the victims will experience serious performance and stability issues. Modifications to individual applications can result in unexpected errors during usage.

Practically any other behavior can be exhibited as the Djvuu ransomware is built-on on a modular code base allowing the hacker operators to change all important parameters and expected outcome.

Djvuu Ransomware – Encryption Process

What is known for the encryption process of the Djvuu ransomware is that every file that gets encrypted will receive the .djvuu extension. The encryption algorithms used to lock the files are AES and RSA 1024-bit.

The targeted extensions of files which are sought to get encrypted are currently unknown and if a list is discovered, it will be posted here as the article gets updated. The files used most by users and which are probably encrypted are from the following categories:

  • Audio files
  • Video files
  • Document files
  • Image files
  • Backup files
  • Banking credentials, etc

The Djvuu cryptovirus could be set to erase all the Djvuu Volume Copies from the Windows operating system with the help of the following command:

→vssadmin.exe delete Djvuu /all /Quiet

In case the above-stated command is executed that will make the encryption process more efficient. That is due to the fact that the command eliminates one of the prominent ways to restore your data. If your computer device was infected with this ransomware and your files are locked, read on through to find out how you could potentially restore your files back to normal.

Remove Djvuu Ransomware Virus and Restore .Djvuu Files

If your computer got infected with the Djvuu ransomware virus, you should have a bit of experience in removing malware. You should get rid of this ransomware as quickly as possible before it can have the chance to spread further and infect other computers. You should remove the ransomware and follow the step-by-step instructions guide provided below.

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Martin Beltov

Martin graduated with a degree in Publishing from Sofia University. As a cyber security enthusiast he enjoys writing about the latest threats and mechanisms of intrusion.

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