WSUU Virus (.WSUU File) 🔐 Decrypt & Removal Guide

The Wsuu virus, known as ransomware, belongs to the STOP/DJVU family. This malware family is known for malignant file encryption operations. Once the Wsuu virus infects a computer, it scans the system for files such as photos, videos, documents, and more. It changes the file structure and adds the “.wsuu” extension to each file, making them unusable without the decryptor.

What Is Wsuu Virus?

The Wsuu virus is a type of malware that ciphers your files and coerces you into paying for their recovery. This malware encrypts a wide selection of file types. Encrypted files are identifiable by a distinct “wsuu” extension. As a result, the files touched by ransomware become impossible to access and use. After that, the ransomware demands a file decryption payment in Bitcoin from the victims, that ranges from $490 to $980, depending on the time passed after the attack. Typically, a text file with ransom payment guidances is named “_readme.txt“.

Wsuu Ransomware operates by Salsa20 encryption algorithms to scramble the contents of the targeted files. Since the Wsuu virus employs such a strong ciphering method, it becomes incredibly hard, if not impossible, to pick the decryption key without the assistance of the attackers.

Once Wsuu malware finishes the encryption, it shows a ransom note to the user, asking for a ransom payment in exchange for the decryption key. The ransom note provides instructions on how to pay off the bill and also often includes threats of permanent data loss or ransom amounts surge if the demands are not met within a specified timeframe.

I have made a comprehensive list of potential solutions, tips, and practices to remove the Wsuu virus and decrypt and recover your files. There are cases when you can decrypt the files, but sometimes, it may be impossible.

Wsuu uses a unique key for every victim, with one exception:

The Wsuu virus bears resemblance to other DJVU ransomware variants such as Kitu, Kizu, Kiqu, and Mitu. This virus encrypts a wide range of common file types and appends its distinct “.wsuu” extension to all files. For instance, a file named “1.jpg” would be altered to “1.jpg.wsuu” and “2.png” to “2.png.wsuu“. Upon successful encryption, the virus creates a special text file named “_readme.txt” and places it in every folder containing the encrypted files.

The image below provides a visual representation of files with the “.wsuu” extension:

Encrypted Files by STOP/DJVU Ransomware

This message asking payment is for restore files via decryption key:

_readme.txt (STOP/DJVU Ransomware) – The scary warning demanding users to pay the ransom to unlock the encrypted data contains these annoying warnings.

Wsuu ransomware arrives as a set of actions that are needed to carry out different functions on a victim’s computer. One of the primary processes being launched is winupdate.exe, a sneaky process that displays a fake Windows update notification during the attack. This is meant to convince the victim that their PC has become slow because of a Windows update. But simultaneously, the ransomware runs another process (which name commonly consists of 4 random characters) which starts scanning the system for target files and encrypting them. Next, the ransomware deletes Volume Shadow Copies from the system using the following CMD command:

vssadmin.exe Delete Shadows /All /Quiet

Once erased, it becomes virtually impossible to recover the previous computer state using System Restore Points. The concern is, ransomware operators are getting rid of any built-in Windows techniques that could aid the victim to restore files for free. In addition, the crooks modify the Windows HOSTS file by appending a list of domains to it and linking them to the localhost IP. As a result, the victim will witness a DNS_PROBE_FINISHED_NXDOMAIN error when accessing one of the listed websites.

We’ve observed that ransomware tries to restrict websites that promote various how-to guides for computer users. It is evident that by restricting specific domains, the perpetrators are trying to hinder the victim from accessing relevant and helpful ransomware-attack-related information online. Malware also saves two text files on the victim’s computer that present attack-related details – the victim’s public encryption key and personal ID. These two files are named bowsakkdestx.txt and PersonalID.txt.

After all these changes, the malware doesn’t cease. Variants of STOP/DJVU tend to install Vidar password-stealing Trojan on compromised systems. This threat has an huge list of capabilities, including:

• Manipulating and viewing files on the victim’s computer without their knowledge.
• Extracting sensitive information such as browser cookies, saved passwords, and browsing history.
• Obtaining unauthorized access to login credentials of Steam, Telegram, and Skype.
• Granting the hackers remote control over the victim’s computer for various malicious activities.
• Stealing cryptocurrency wallets from the victim’s system.
• Gathering sensitive data by running malicious software on the victim’s computer.

The cryptography algorithm used by DJVU/STOP virus is AES-256. So, if your data got encrypted with an online decryption key, the possibility to get your files back are quite low. Thing is, the key is unique for each victim, and picking it will take exceptionally big amount of time.

Getting the online decryption key in another way is also merely impossible. It is stored on a command server owned by the criminals who promote the Wsuu malware. For receiving decryption key the payment should be $980. To obtain the payment details, the victims should contact the fraudsters by email ([email protected]).

The message by the ransomware states the following information:

ATTENTION!

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:

https://we.tl/t-WJa63R98Ku

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:

[email protected]

Reserve e-mail address to contact us:

[email protected]

Your personal ID:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Do not pay the ransom!

Please, try to use the available backups, or Decrypter tool

The _readme.txt document also states that the system owners should contact the hackers within 72 hours after the attack. On the condition of getting in touch within 72 hours, hackers grant a 50% off. Thus the ransom amount will be minimized down to $490. Yet, stay away from paying off the ransom! I highly recommend that you do not contact these fraudsters and do not pay. One of the most real working solution to retrieve the lost data is just using the available backups, or using Decrypter tool from Emsisoft.

The distinctiveness of such malware is the employment a similar set of actions for generating the unique decryption key to recover the ciphered data. Thus, unless the ransomware is still under the stage of development or has some hard-to-track encryption, manually recovering the ciphered data is a thing you can’t perform. The sole remedy to prevent the data loss is to regularly make backups of your important files.

Remember that even if you do create such backups regularly, they must be stored into a specific location without loitering, not being connected to your main workstation. For instance, the backup may be kept on the USB flash drive or some substitute external hard drive storage. Optionally, you may rely to the help of online (cloud) information storage.

Needless to say, when you maintain your backup data on your common device, it may be encrypted together with your files. For this reason, storing the backup on your computer’s disk is surely not a wise idea.

How I was infected?

Ransomware has a various methods to built into your system. But it doesn’t really matter what way had place in your case.

Ransomware attack following a successful phishing attempt.

However, these are the common techniques that can inject it into your PC:

• Distributing the virus undetected through online free hosting resources.
• Hiding the virus installer amongst various apps, especially those offered as freeware or shareware.
• Spreading the virus via spam emails that contain deceptive links, leading to its installation.
• Exposing users to potential malware threats when downloading pirated software from illegal peer-to-peer (P2P) resources.

In some instances, the Wsuu virus disguised itself as a legitimate procedure, such as prompting a browser update message or requiring a crucial codec for online media playback. This is a common approach scammers use to make you install the ransomware manually. They trick you into participating directly in the process.

Naturally, the misleading update notification won’t disclose that you’re about to inject the virus. Instead, the process will masquerade under an alert statement, claiming that you need to install an urgent security update or a suspicious program.

Software cracks also pose a threat. Using P2P platforms is illegal and presents a risk of introducing severe malware, including the Wsuu ransomware.

In summary, what can you do to prevent ransomware from infiltrating your computer? Though there’s no absolute guarantee to protect your PC from compromise, I offer some precautionary advice to ward off Wsuu penetration: Be vigilant while using free software.

Ensure that you always read the offerings listed in the installation window, aside from the main free program. Stay away from executing suspicious email attachments and files from unknown senders. Most importantly, keep your current anti-malware program up-to-date.

The malware operates covertly. It won’t appear in the list of your available programs but it will conceal under a harmful process that consistently runs in the background, beginning when you start your computer.

How To Remove Ransomware?

Furthermore, the Djvu ransomware has also installed the Vidar Stealer on PC to take account credentials, cryptocurrency wallets, desktop files, and more.

How To Decrypt .wsuu Files?

The newest extensions released around the end of August 2019 after the criminals made changes. This includes Kitu, Kizu, Kiqu etc.

As a consequence of the modifications made by the criminals, STOPDecrypter is no longer backed. It has been replaced with the Emsisoft Decryptor for STOP Djvu Ransomware developed by Emsisoft.

You can download free decryption tool here: Decryptor for STOP Djvu.

1. Select folders for decryption.

   Based on the default configurations, the decryptor will automatically choose the reachable directories in order to decode the currently accessible drives (the connected ones), including the network drives. You can choose other locations with the “Add” button.

   Decryptors typically propose several options depending on the specific malware family. The existing possible options are presented in the Options tab and can be turned on or turned off there. You may discover a comprehensive list of the currently active Options below.

2. Click on the “Decrypt” button.

   As soon as you add all the desired locations for decryption into the list, click on the “Decrypt” button in order to initiate the decryption procedure.

   Note that the main screen may turn you to a status view, letting you know of the active process and the decryption statistics of your data:

   

   The decryptor will notify you as soon as the decryption procedure is completed. If you need the report for your personal papers, you can save it by choosing the “Save log” button. Note that it is also possible to copy it directly to your clipboard and to paste it into emails or messages here if you need to do so.

The Emsisoft Decryptor might display different messages after a failed attempt to restore your files:

✓ Error: Unable to decrypt file with ID: [your ID]

✓ No key for New Variant online ID: [your ID]

Notice: this ID appears to be an online ID, decryption is impossible

✓ Result: No key for new variant offline ID: [example ID]

This ID appears be an offline ID. Decryption may be possible in the future.

✓ Remote name could not be resolved

How to Restore .wsuu Files?

In some case ransomware is not doom for your files…

The Wsuu ransomware encryption mechanism feature is next: it encrypts every file byte-by-byte, then saves a file copy, erasing (not overriding!) the original file. Hence, the data of the file location on the disk drive is lost, but the original file is not erased from the disk. The cell, or the sector where this file was stored, can still keep this file, but it is absent in the file system and can be rewritten by data that has been loaded to this drive after the removal. Hence, it is possible to recover your files using special software.

Recovering your files with PhotoRec

PhotoRec is an free open-source program, which is initially created for data recovery from damaged disks, or for data recovery in case if they are unintentionally deleted. However, with time flow, this program adopted the ability to recover the files of 400 different file types. Hence, it can be used for file restoration after the Wsuu attack.

First, you need to download this app. It is 100% free, but the developer notifies that there is no warranty that the files will be retrieved. PhotoRec is spread together with other program of the same developer – TestDisk. The program archive will bear TestDisk name, but don’t worry. PhotoRec files are right inside.

To open PhotoRec, you need to find and open “qphotorec_win.exe” file. No installation is needed – this program has all the files it need within the archive, hence, you can mount it on your USB drive, and try to help your friends/parents/anyone who has been attacked by Wsuu ransomware.

Upon the launch, you will observe the screen showing you the complete list of your disk drives. However, this details are probably futile, because the required menu is placed a bit higher. Click this menu, then choose the disk which was attacked by ransomware.

After opting for the disk, you need to select the destination folder for the restored files. This menu is located at the lower part of the PhotoRec window. The best option is to export them on USB drive or any other type of removable disk.

Then, you need to specify the file formats. This setting is located at the bottom, too. As it was mentioned, PhotoRec can regain the files of about 400 different formats.

Finally, you can initiate files retrieval by pressing the “Search” button. You will view the screen where the results of the scan and recovery are shown.

Recovery of Encrypted Files

Frequently Asked Questions

1. My files are encrypted by ransomware, what should I do now?
2. About DJVU (STOP) Ransomware.

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