TTZA Virus (.TTZA File) πŸ” Decryption + Removal

Written by Brendan Smith

The Ttza virus, belongs to the STOP/Djvu ransomware family. This malware family has gained notoriety for its malicious file encryption capabilities. Once the TTZA virus infiltrates a computer, it actively targets various types of files, including documents, videos, photos, and more. It alters the file structure and appends the “.ttza” extension to every encrypted file, rendering them unusable without decryption.

Ttza Virus Overview

Ttza

πŸ€” Ttza malware belongs to ransomware that originates from the DJVU/STOP ransomware family. Its main target is to lock your files. After that ransomware virus asks for a ransom payment – ($490 – $980) in Bitcoin.

The Ttza virus actively encrypts your files and compels you to pay for their decryption. This ransomware encrypts a variety of file types, and you can recognize the encrypted files by the distinct “.ttza” extension. Consequently, the affected files become both inaccessible and unusable.

Following this, the ransomware demands a Bitcoin payment for file decryption from its victims, with amounts ranging from $490 to $980. In all instances, a text file containing ransom payment instructions is named “_readme.txt“.

Ttza Ransomware utilizes Salsa20 encryption algorithms to cipher the targeted files. Because Ttza employs such a robust ciphering method, it becomes exceedingly difficult, if not impossible, to ascertain the decryption key without cooperating with the attackers.

Once the Ttza malware completes the encryption process, it presents a ransom note to the user, demanding payment for the decryption key. The ransom note includes instructions on how to make the payment and often includes threats of permanent data loss or increased ransom amounts if the payment is not made within a specified timeframe.

I have created a comprehensive list of the solutions, tips, and approaches to neutralize the Ttza and decrypt your files. There are situations where you can regain access to the files, while sometimes, it may be impossible.

Brendan Smith
Brendan Smith
IT Security Expert
First, perform a PC scan using an antivirus tool!
I will assist you in removing the Ttza virus and guide you through the process of decrypting or restoring encrypted files. Below, you will find several universally applicable methods to recover encrypted .ttza files. It is crucial to thoroughly read and comprehend the entire set of instructions. Do not skip any steps. Each step is of utmost importance and must be completed by you.
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πŸ“Œ Important Reminder!

It is critical to say that paying off the bill is not a guarantee of the successful files recovery. The rascals behind the STOP/Djvu are known for their untrustworthiness. There were the cases where victims have paid the ransom, only to be denied by the cyber criminals with the decryption key provision.

Ttza uses a distinct key for each victim, except in one specific scenario:

  • If Ttza is unable to establish a connection with its command and control server (C&C Server) before initiating the encryption process, it resorts to employing offline keys. An offline key is not unique and remains consistent for all users, thereby enabling the decryption of files that the ransomware has encrypted.

The Ttza is highly similar to other DJVU ransomware variants like Ttwq, Ttrd, Mzre, and Mzhi. This virus encrypts a wide range of common file types and appends its distinct “.ttza” extension to all files. For instance, a file named “1.jpg” would be altered to “1.jpg.ttza” and “2.png” to “2.png.ttza“.

After successful encryption, the virus spawns a special text file named “_readme.txt” and places it in every folder containing the encrypted files. It also adds this file to the desktop, so the victim will not miss the attack even without opening folders.

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

Ttza Ransomware- encrypted ttza files

Encrypted Files by STOP/DJVU Ransomware

Name Ttza Virus
Ransomware family1 DJVU/STOP2 ransomware
Extension .ttza
Ransomware note _readme.txt
Ransom From $490 to $980 (in Bitcoins)
Contact [email protected], [email protected]
Detection Win32/Agent_AGen.BAE Virus Removal, TrojanRansom.Cerber Virus Removal, Ransom:Win32/MoneyMessage.A!ibt Virus Removal
Symptoms
  • It encrypts most of your files (photos, videos, documents) and adds a particular “.ttza” extension;
  • It can delete Volume Shadow copies to make victim’s attempts to restore data impossible;
  • It adds a list of domains to the HOSTS file to block access to certain security-related sites;
  • It installs a password-stealing Trojan on the system, like Vidar Stealer or RedLine Stealer;
  • It manages to install a SmokeLoader backdoor;
Fix Tool To remove possible malware infections, scan your PC:


6-day free trial available.

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

_readme.txt (STOP/DJVU Ransomware)

_readme.txt (STOP/DJVU Ransomware) – The terrifying notification insisting users to pay off the ransom to decrypt the encrypted data contains these annoying warnings.

Ttza virus performs a series of operations to execute various functions on a victim’s computer. One of the initial processes it launches is winupdate.exe, a deceptive process that displays a false Windows update alert during the attack. This trick convinces the victim that their PC has become slow due to a Windows update.

Simultaneously, the ransomware initiates another process (usually named with four random characters), which scans the system for target files and encrypts them. The ransomware then removes Volume Shadow Copies from the system disk using the following CMD command:

vssadmin.exe Delete Shadows /All /Quiet

Once deleted, it becomes nearly impossible to restore the previous computer state using System Restore Points. The concern is that ransomware operators eliminate any built-in Windows techniques that could help the victim recover files for free. Additionally, the hackers modify the Windows HOSTS file by appending a list of domains to it and linking them to the localhost IP. Consequently, the victim encounters a DNS_PROBE_FINISHED_NXDOMAIN error when accessing one of the blacklisted websites.

We have observed that the ransomware attempts to restrict access to websites that offer various how-to guides for computer users. It is evident that by blocking specific domains, the criminals are trying to prevent the victim from accessing relevant and helpful information about ransomware attacks online. The malware also stores two .txt files on the victim’s computer containing attack-related details: the victim’s public key and personal ID. These two files are named bowsakkdestx.txt and PersonalID.txt.

Ttza ransomware virus saves the public encryption key and victim's ID in the bowsakkdestx.txt file

After all these changes, the malware does not stop. Variants of STOP/DJVU are prone to deploying the Vidar password-stealing Trojan on compromised systems. This threat has a wide range 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 for 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 in STOP/Djvu ransomware is Salsa20. If your data gets encrypted with an online decryption key, the chances of recovering your files without paying the ransom are quite low. The reason is that this key is unique for each victim, and retrieving it would take a significant amount of time.

Obtaining the online decryption key through other means is also nearly impossible. It is stored on a command server owned by the criminals who distribute the Ttza virus. To receive the unlocking key, the payment required is $980. Victims need to contact the fraudsters by email ([email protected]) to get payment details.

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 the strongest encryption and unique key.
The only method of recovering files is to purchase a decrypt tool and a unique key for you.
This software will decrypt all your encrypted files.

What guarantees do you have?

You can send one of your encrypted files from your PC and we decrypt it for free.
But we can decrypt only 1 file for free. The file must not contain valuable information.

You can get and look video overview decrypt tool:

https://we.tl/t-WJa63R98Ku

The price of private key and decrypt software is $980.
Discount of 50% available if you contact us first 72 hours, that 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 an answer for more than 6 hours.

To get this software you need to write on our e-mail:

[email protected]

Reserve an e-mail address to contact us:

[email protected]

Your personal ID:
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

How To Remove Ransomware?

Remove Ttza Virus with Gridinsoft Anti-Malware

We have also been using this software on our systems ever since, and it has always been successful in detecting viruses. It has blocked the most common Ransomware as shown from our tests with the software, and we assure you that it can remove Ttza Virus as well as other malware hiding on your computer.

Gridinsoft Anti-Malware - Main Screen

To use Gridinsoft for remove malicious threats, follow the steps below:

1. Begin by downloading Gridinsoft Anti-Malware, accessible via the blue button below or directly from the official website gridinsoft.com.

2.Once the Gridinsoft setup file (setup-gridinsoft-fix.exe) is downloaded, execute it by clicking on the file.

setup-gridinsoft-fix.exe

3.Follow the installation setup wizard's instructions diligently.

Gridinsoft Setup Wizard

4. Access the "Scan Tab" on the application's start screen and launch a comprehensive "Full Scan" to examine your entire computer. This inclusive scan encompasses the memory, startup items, the registry, services, drivers, and all files, ensuring that it detects malware hidden in all possible locations.

Scan for Ttza Virus Ransomware

Be patient, as the scan duration depends on the number of files and your computer's hardware capabilities. Use this time to relax or attend to other tasks.

5. Upon completion, Anti-Malware will present a detailed report containing all the detected malicious items and threats on your PC.

The Ttza Virus was Found

6. Select all the identified items from the report and confidently click the "Clean Now" button. This action will safely remove the malicious files from your computer, transferring them to the secure quarantine zone of the anti-malware program to prevent any further harmful actions.

The Ttza Virus has been removed

8. If prompted, restart your computer to finalize the full system scan procedure. This step is crucial to ensure thorough removal of any remaining threats. After the restart, Gridinsoft Anti-Malware will open and display a message confirming the completion of the scan.

Remember Gridinsoft offers a 6-day free trial. This means you can take advantage of the trial period at no cost to experience the full benefits of the software and prevent any future malware infections on your system. Embrace this opportunity to fortify your computer's security without any financial commitment.

Trojan Killer for “Ttza Virus” removal on locked PC

In situations where it becomes impossible to download antivirus applications directly onto the infected computer due to malware blocking access to websites, an alternative solution is to utilize the Trojan Killer application.

Trojan Killer - Main View

There is a really little number of security tools that are able to be set up on the USB drives, and antiviruses that can do so in most cases require to obtain quite an expensive license. For this instance, I can recommend you to use another solution of GridinSoft - Trojan Killer Portable. It has a 14-days cost-free trial mode that offers the entire features of the paid version. This term will definitely be 100% enough to wipe malware out.

Trojan Killer is a valuable tool in your cybersecurity arsenal, helping you to effectively remove malware from infected computers. Now, we will walk you through the process of using Trojan Killer from a USB flash drive to scan and remove malware on an infected PC. Remember, always obtain permission to scan and remove malware from a computer that you do not own.

Step 1: Download & Install Trojan Killer on a Clean Computer:

1. Go to the official GridinSoft website (gridinsoft.com) and download Trojan Killer to a computer that is not infected.

Download Trojan Killer

2. Insert a USB flash drive into this computer.

3. Install Trojan Killer to the "removable drive" following the on-screen instructions.

Install Trojan Killer to Removable Drive

4. Once the installation is complete, launch Trojan Killer.

Step 2: Update Signature Databases:

5. After launching Trojan Killer, ensure that your computer is connected to the Internet.

6. Click "Update" icon to download the latest signature databases, which will ensure the tool can detect the most recent threats.

Click Update Button

Step 3: Scan the Infected PC:

7. Safely eject the USB flash drive from the clean computer.

8. Boot the infected computer to the Safe Mode.

9. Insert the USB flash drive.

10. Run tk.exe

11. Once the program is open, click on "Full Scan" to begin the malware scanning process.

Searching Ttza Virus Virus

Step 4: Remove Found Threats:

12. After the scan is complete, Trojan Killer will display a list of detected threats.

Searching Ttza Virus Finished

13. Click on "Cure PC!" to remove the identified malware from the infected PC.

14. Follow any additional on-screen prompts to complete the removal process.

Restart needed

Step 5: Restart Your Computer:

15. Once the threats are removed, click on "Restart PC" to reboot your computer.

16. Remove the USB flash drive from the infected computer.

Congratulations on effectively removing Ttza Virus and the concealed threats from your computer! You can now have peace of mind, knowing that they won't resurface again. Thanks to Gridinsoft's capabilities and commitment to cybersecurity, your system is now protected.

Video Guide


How To Decrypt .ttza Files?

How to restore big files?

Try deleting .ttza extension on a few big files and opening them. This malware has issues with large files encryption. Either the virus read and did not encrypt the file, or it bugged and did not add the filemarker. If you have files that are very large (2GB+), such a situation is highly probable. Please, text me in the comments whether this helped you or not.

Criminals made changes around the end of August 2019, and they released the newest extensions. As a result of the criminals’ changes, STOPDecrypter no longer assists. Emsisoft developed the Emsisoft Decryptor for STOP Djvu Ransomware, replacing it.

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

  1. Download and run decryption tool.

    Start downloading the decryption tool.

    Make sure to launch the decryption utility as an administrator. You need to agree with the license terms that will come up. For this purpose, click on the “Yes” button:

    Emsisoft Decryptor - license terms

    As soon as you accept the license terms, the main decryptor user interface comes up:

    Emsisoft Decryptor - user interface

  2. Select folders for decryption.

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

    Decryptors usually propose several options depending on the specific malware family. The present possible options are shown in the Options tab and can be activated or deactivated there. You may discover a detailed list of the currently active Options below.

  3. 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:

    Emsisoft Decryptor - the decryption statistics

    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:

βœ“ Error: Unable to decrypt file with ID: [your ID]

There is no corresponding decryption key in the Emsisoft decryptor’s database.

βœ“ No key for New Variant online ID: [your ID]

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

Your original files were encrypted with an online key. Your key is unique and is kept on the command server, controlled by criminals. File recovery is only possible through paying the ransom. πŸ™

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

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

Malware used an offline key, though the file recovery operation failed (the offline decryption key isn’t available yet). But, this message is a good news for you, since it is possible to restore your files in the future. πŸ™‚

It can take a few weeks or months until the decryption key gets found and uploaded to the decryptor. Please follow updates regarding the decryptable DJVU versions here.

βœ“ Remote name could not be resolved

This stands for a DNS issue present in your system. Our first recommendation is to reset your HOSTS file back to default.

How to Restore .ttza Files?

In some case ransomware is not doom for your files…

The TTZA encryption algorithm is next: it encodes every file byte-by-byte, then saves a duplicate, deleting (not overriding!) the original file. Hence, the data of the file location on the disk drive is lost, but the original file is not deleted from the disk. The cell, or the sector where this file was kept, can still keep this file, but it is not listed by the file system and can be overwritten by data that has been loaded to this drive after the deletion. Hence, it is possible to restore your files using special software.

I recently had my pc infected by the this virus. It managed to bypass 2 Antivirus software and 2 malware fighters.

Anyway, after realizing it was an online algorithm, it is impossible to retrieve my encrypted files. I also had my backup drive plugged in at the time of the virus, and this was also infected, or so I thought. Every folder within my backup drive had been infected and was encrypted. However, despite losing some important files, I retrieved almost 80% of my 2TB storage.

When I started going through the folders, I noticed the readme.txt ransom note in every folder. I opened some of the folders and found that all files that were not in a subfolder within that folder had been encrypted. However, I found a flaw and glimmer of hope when I went into the subfolders in other folders and found that these files had not been encrypted. Every folder within my c and d drives, including subfolders, had been encrypted, but this was not the case with the backup drive. Having subfolders created within a folder has saved 80% of my data.

As I said, I believe this to be only a small loophole on a backup drive. I’ve since found a further 10 % of my data on another hard drive on a different pc. So my advice is if you use a backup drive, create subfolders. I was lucky, I guess. But I was also unlucky that the virus hit as I was transferring some files from my backup.

Hopefully, this can help some other people in my situation.

Jamie Newland
Some pointers for recovery repair of Ttza files (true for all STOP/DJVU variants):

  • I have seen Stop/Djvu variants fail to encrypt deeper nested folders, so that you can check that. You may find those are not encrypted.
  • This ransomware saves encrypted data to a new file, deletes the original. So there’s a slight chance part of that deleted file can be recovered using file recovery software. It’s unlikely the folder structure can be restored, so a free tool like PhotoRec may be as good as any.
  • This ransomware only partially encrypts (about the first 150 KB), so depending on file size and type of data, the not encrypted part may be recoverable.
  • Joep

    Recovering your files with PhotoRec

    PhotoRec is an free program, which is originally created for files recovery from damaged disks, or for file retrieval in case if they are unintentionally deleted. However, with time flow, this program adopted the ability to retrieve the files of 400 different file types. Hence, it can be used for file restoration after the Ttza virus attack.

    First, you need to download this app. It is 100% free, but the developer states that there is no assurance that your files will be recovered. PhotoRec is spread in a pack with another utility of the same developer – TestDisk. The resulting archive will have TestDisk name, but don’t worry. PhotoRec files are right inside.

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

    PhotoRec file in the folder for restore Ttza files

    After the launch, you will encounter the screen showing you the full list of your drives. However, this data is presumably useless, because the required menu is placed a bit higher. Click this bar, then choose the disk which was attacked by ransomware.

    Choose the disc in PhotoRec

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

    Choosing the destination folder of recovery Ttza files

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

    Choose the file format

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

    Recovery process

    TTZA files recovery (Video Guide)


    Frequently Asked Questions

    πŸ€” How can I open “.ttza” files?

    There is no way to open “.ttza” files. These files have been encrypted by ransomware, and their contents are inaccessible until they are decrypted.

    πŸ€” TTZA virus has blocked my infected PC, and I can’t get the activation code.

    If your PC is blocked by this virus, you’ll need to prepare a memory stick with a pre-installed Trojan Killer. You can find more information on how to do this here.

    πŸ€” Decryptor did not decrypt all my files, or not all of them were decrypted. What should I do?

    If the decryptor did not successfully decrypt all your files, or if some remain encrypted, please exercise patience. You have been infected with the new version of STOP/DJVU ransomware, and the decryption keys have not yet been released. Keep yourself updated by following the news on our website. We will notify you as soon as new keys or decryption programs become available.

    πŸ€” What can I do right now?

    The Ttza ransomware encrypts only the first 150KB of files. So MP3 files are rather large, some media players (Winamp for example) may be able to play the files, but – the first 3-5 seconds (the encrypted portion) will be missing.

    You can try to find a copy of an original file that was encrypted:

    • Files you downloaded from the Internet that were encrypted and you can download again to get the original.
    • Pictures that you shared with family and friends that they can just send back to you.
    • Photos that you uploaded on social media or cloud services like Carbonite, OneDrive, iDrive, Google Drive, etc
    • Attachments in emails you sent or received and saved.
    • Files on an older computer, flash drive, external drive, camera memory card, or iPhone where you transferred data to the infected computer.

    If the guide doesn’t help you to remove TTZA virus, please download the GridinSoft Anti-Malware that I recommended. Do not forget to share your experience in solving the problem. Please leave a comment here! This can help other victims to understand they are not alone. And together we will find ways to deal with this issue.

    I require your assistance in sharing this article.

    It is now your opportunity to aid others. I have authored this guide with the intention of assisting individuals like yourself. You can utilize the buttons below to distribute this on your preferred social media platforms, including Facebook, Twitter, or Reddit.

    Brendan Smith
    How To Restore & Decrypt .TTZA Files?

    Name: TTZA Ransomware

    Description: The STOP/DJVU family of ransomware infections includes this virus. TTZA encrypts a variety of file types, including videos, photos, and documents, which are then marked with a distinctive ttza extension. Consequently, the files that fall victim to this encryption become inaccessible and unusable. Following this, the TTZA virus proceeds to demand a ransom payment in Bitcoin from its victims, with amounts ranging from $490 to $980.

    Operating System: Windows

    Application Category: Virus

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    User Review
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    References

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

    About the author

    Brendan Smith

    I'm Brendan Smith, a passionate journalist, researcher, and web content developer. With a keen interest in computer technology and security, I specialize in delivering high-quality content that educates and empowers readers in navigating the digital landscape.

    With a focus on computer technology and security, I am committed to sharing my knowledge and insights to help individuals and organizations protect themselves in the digital age. My expertise in cybersecurity principles, data privacy, and best practices allows me to provide practical tips and advice that readers can implement to enhance their online security.

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