Djvu VirusRansomwareRemoval Guide

Tcbu Virus Removal Guide (+Decrypt .tcbu files)

Tcbu – Ransomware

Tcbu is a malicious software functioning as common ransomware. Michael Gillespie, the well-known malware researcher, first discovered this new name in the DJVU ransomware family.

Tcbu was created for the sole function to encrypt all popular file types. Rationally, as soon as the file encryption is effectively achieved, the users are unable to get access to them. Tcbu ransomware includes its own “.tcbu” to all the encrypted data. For instance, the file “price_list.xls”, when modified by Tcbu, will be entitled as “price_list.xls.tcbu”. As soon as the encryption is accomplished, Tcbu puts its own special text document (_readme.txt) into all the folders that keep the encrypted files.

The alert mentioned by _readme.txt asking for the random os really comparable to the notifications offered by other ransomware threats coming from the DJVU family. The caution generally indicates that the files have been encrypted and the only solution to get access to it is to use a special standalone key. Regretfully, this statement is definitely true.

The technique to encrypt the files utilized by Tcbu is not totally investigated. Nevertheless, there is no doubt that each computer system owner might be issued an unique decryption key, which is absolutely unique. It is extremely tough to recuperate the information without the suitable type in place.

“Don’t worry, you can return all your files!”, from text file message:

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

One more peculiarity of the Tcbu virus is that the users are not able to get access to the key. The decrypting key is hosted on a special server under the complete control by the scoundrels who have launched the Tcbu virus into the internet. In order to obtain the key and restore the essential data, the users are informed to get in touch with the frauds by means of e-mail or by telegram and to pay the ransom in the quantity of $980.

The message also says that the people must contact the Tcbu authors within 72 hours upon the minute of the information encryption. The alert shows that by doing so individuals will get a 50% discount, therefore, the ransom quantity drops down to $490.

No matter what the amount of the ransom is, we highly encourage that you do not pay the ransom. There is no warranty that these online criminals will keep their promises, so they might not care at all what the victims feel about the file encryption, even when the amount of the ransom is received into their accounts. Hence, paying ransom often does not lead to an effective recovery. So, the users might merely lose their money for nothing.

Similarly, we prompt you not to contact the scams as they advise. Do not transfer cash into their wallets. There are no applications that could crack the Tcbu ransomware or bring back the information at no charge. For that reason, the only right decision is to restore the information from possible backups (if available).

Virus Summary

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

Do not forget that the Web is now filled with infections comparable to the Tcbu ransomware. For instance, this particular danger is essentially similar to Brusaf and other ransomware-type infections. These damaging energies have been developed in order to secure the essential information and express the demand for the users to pay the ransom. All these infections use the identical algorithm to produce the particular key for successful files decryption.

Unless the Tcbu ransomware is still under the advancement procedure or has got some hidden bugs, it is not possible to restore the data manually. Therefore, the only working option to prevent the loss of your important information is to regularly preserve updated backups of all your crucial documents.

Another crucial piece of advice is to save the backups on unique storage not connected to your main computer. For example, you might keep it on the USB Flash Drive, or some external disk drive, or by using the cloud data storage services. Keeping the backups on your regular drive is really risky, because the backup may likewise be secured by the Tcbu virus.

Leaks for the Tcbu ransomware attack.

Tcbu utilizes numerous courses to infiltrate the vulnerable computer systems. It is not certain what particular approach was utilized in your case, however, the invasion might happen through the following channels:

  • bundling with third-party programs, primarily free software;
  • spam emails from the unknown senders;
  • websites providing free hosting;
  • P2P (peer-to-peer) torrent downloads.

There are times when the Tcbu virus might camouflage itself as some genuine application, for instance, through the misleading signals demanding setup of some software application update. This is the most typical technique used by the frauds to inject the Tcbu infection files into the system. In this manner users partly participate in its installation, without clearly understanding the danger.

Moreover, the scams might send unsolicited spam email with difficult signals motivating individuals to open suspicious accessories or click on some download links, for instance, those encouraging individuals to open certain images, text files, tax documents and other info.

No doubt, opening these files or clicking the harmful links might essentially damage the system. Fake Acrobat Reader update notifications may cause the Tcbu ransomware infiltration. Similarly, downloading the broken software application might additionally consist of the ransomware installer. The last but not the least, installation of Tcbu may take place through some Trojan horses that may be set up stealthily into the system and without the user’s direct consent or perhaps approval.

Avoiding the Tcbu virus attack.

Of course, there is no outright guarantee that your computer will be constantly free of any malware attacks, nevertheless, we would like to share some helpful tips with you to make it much safer. Ensure to pay really attention while browsing the web and particularly while downloading cost-free programs. Do not open any dubious e-mail accessories, especially if the sender is not understood to you.

Do not forget that certain freeware installer may likewise include some other additional apps in the package. These additional applications might be really destructive. It is of utmost significance to keep your anti-virus software application and your operating system in general to be always correctly updated.

It is rather logical that downloading pirated programs is unlawful, nevertheless, additionally, such unauthorized software application usage might also bring severe damage to your computer. For this reason, do not download any split programs. Plus, the fact that your existing anti-virus did not safeguard the system from the Tcbu ransomware is a good factor for you to reassess your options and change to another program that can render the securing functions on a much better level.

Below please find the quotation from the Tcbu 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 “.tcbu” extension added by the ransomware:”

Tcbu Ransomware - encrypt files with .tcbu extension

Use GridinSoft Anti-Malware to remove Tcbu 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 tcbu files

You can get 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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