TGVV Virus (.TGVV Files Ransomware) Decrypt + Removal Tool

While analyzing malware samples submitted to VirusTotal¹, I have identified the presence of TGVV ransomware, which belongs to the STOP/Djvu ransomware family. Once a computer becomes infected, TGVV proceeds to encrypt files and adds the “.tgvv” extension to their original filenames. For instance, a file named “a.jpg” would be renamed as “a.jpg.tgvv“, while “b.doc” would be transformed into “b.doc.tgvv“.

I’ve put together a complete listing of all the possible solutions, tricks and practices in neutralizing the Tgvv virus, and encryption of files. In some cases it’s easy to recover your files. In other cases, it’s impossible.

The Tgvv key is unique for every victim, with an other exception:

• If Tgvv cannot establish a connection with the command and control server (C&C Server) prior to beginning the encryption process, it will use the offline key. This key is the same to all the victims which makes it feasible to decrypt encrypted files during a ransomware attack.

Is Tgvv virus?

Yes, “Tgvv” can be correctly identify as a STOP/Djvu ransomware-type virus.

The Tgvv ransomware is a kind of threat that encrypted your documents and then forces you to pay for them. The image below gives a clear vision of how the files with “.tgvv” extension look like:

Tgvv File (STOP/DJVU Ransomware)

This _readme.txt file asking payment is for get files back via decryption key:

_readme.txt (STOP/DJVU Ransomware) – The scary alert demanding from users to pay the ransom to decrypt the encoded files contains these frustrating warnings

Overview of Tgvv Ransom Note

The Tgvv ransom note provides specific instructions to victims, emphasizing the importance of contacting the threat actors within a 72-hour timeframe. Failure to comply may result in an increased payment amount of $980, up from the initial $490, which covers the costs associated with the decryption software and key.

The note highlights that file decryption is impossible without these essential tools. Furthermore, the “_readme.txt” file mentions the option for victims to send a single encrypted file for decryption at no cost. To establish communication with the attackers, victims are provided with two email addresses: [email protected] and [email protected].

Further Details on Tgvv Ransomware

Decryption of files affected by ransomware is typically challenging without the involvement of the cybercriminals responsible for the attack. Victims have limited options to restore their files without paying a ransom, such as relying on data backups or searching for third-party decryption tools online.

Paying a ransom to the attackers is strongly discouraged due to the risk of them not fulfilling their promise to provide the necessary decryption tools. It is crucial to promptly remove ransomware from compromised systems to prevent further data loss and the potential spread of ransomware to other computers within the same network.

Tgvv ransomware arrives on a victim’s computer as a set of processes that perform different tasks. One of the first tasks is the launch of winupdate.exe, a tricky process that displays a fake Windows update prompt during the attack. The intention is to convince the victim that a sudden system slowdown is caused by a Windows update. Simultaneously, the ransomware initiates another process (usually named by four random characters) that scans the system for target files and encrypts them. Next, the ransomware deletes Volume Shadow Copies from the system using the following CMD command:

vssadmin.exe Delete Shadows /All /Quiet

Once deleted, it becomes impossible to restore the previous computer state using System Restore Points. The ransomware operators aim to eliminate any Windows OS-based methods that could help the victim restore files for free. Additionally, the crooks modify the Windows HOSTS file by adding a list of domains to it and mapping them to the localhost IP. Consequently, when accessing one of the blocked websites, the victim encounters a DNS_PROBE_FINISHED_NXDOMAIN error.

We have observed that the ransomware attempts to block websites that publish various how-to guides for computer users. Evidently, by restricting specific domains, the crooks aim to prevent the victim from accessing relevant and helpful information about ransomware attacks online. The virus also saves two text files on the victim’s computer that provide attack-related details: the victim’s public encryption key and personal ID. These two files are named bowsakkdestx.txt and PersonalID.txt.

After implementing these modifications, the malware does not cease its activities. Variants of STOP/DJVU often deploy the Vidar password-stealing Trojan on compromised systems. This threat possesses an extensive range of capabilities, including:

• Stealing login/password information for Steam, Telegram, and Skype
• Stealing cryptocurrency wallets
• Downloading and running malware on the compromised computer
• Stealing browser cookies, saved passwords, and browsing history
• Viewing and manipulating files on the victim’s computer
• Enabling hackers to perform various tasks on the victim’s computer remotely

The DJVU/STOP ransomware family uses the AES-256 cryptography algorithm. Therefore, if your files have been encrypted with an online decryption key, it is impossible to decrypt them without the unique key.

In the event that Tgvv operated in online mode, you cannot gain access to the AES-256 key. It is stored on a remote server owned by the fraudsters who promote the Tgvv ransomware.

To obtain the decryption key, a payment of $980 is required. The victims are instructed to contact the fraudsters via email

([email protected]) to receive 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 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 for Tgvv!

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

_readme.txt file also indicates that the computer owners must get in touch with the Tgvv representatives during 72 hours starting from the moment of files were encrypted. On the condition of getting in touch within 72 hours, users will be granted a 50% rebate. Thus the ransom amount will be minimized down to $490). However, stay away from paying the ransom!

I strongly recommend that you do not contact these frauds and do not pay. The one of the most real working solution to recover the lost data – just using the available backups, or use Decrypter tool.

The peculiarity of all such viruses apply 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 possesses with some hard-to-track flaws, manually recovering the ciphered data is a thing you can’t perform. The only solution to prevent the loss of your valuable data is to regularly make backups of your crucial files.

Note that even if you do maintain such backups regularly, they ought to be put 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 alternative external hard drive storage. Optionally, you may refer to the help of online (cloud) information storage.

Needless to mention, when you maintain your backup data on your common device, it may be similarly ciphered as well as other data.

For this reason, locating the backup on your main PC 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 concrete method had place in your case.

Tgvv virus attack following a successful phishing attempt.

How To Remove Tgvv Virus?

In addition to encode a victim’s files, the Tgvv virus has also started to install the Vidar Stealer on computer to steal account credentials, cryptocurrency wallets, desktop files, and more.⁴

Reasons why I would recommend GridinSoft⁵

1. Run the setup file.

   
   

2. Press “Install” button.

   

3. Once installed, Anti-Malware will automatically run.

   

4. Wait for complete.

   

5. Click on “Clean Now”.