CUBA Files Virus (Cuba Ransomware Removal Guide)

Buran ransomware
buran ransomware
Written by Brendan Smith
Cuba is a BURAN family of ransomware-type infections1. The infection encrypts your private files (video, photos, documents). The infected files can be tracked by specific “.cuba” extension. So, you can’t use them at all.
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In this tutorial I will try to help you remove Cuba ransomware without any payment. As bonus I will assist you in decoding your crypted files.

What is “Cuba”?

Cuba can be correctly identify as a ransomware infection.

Ransomware is a kind of virus that crypted your documents and then forces you to pay for them. It crypted all popular file types. Hence, users cannot work with the your documents or photos. Cuba adds its own “.cuba” extension into all files. For example, the file “video.avi”, will be changed into “video.avi.cuba”. As soon as the encryption is successfully accomplished, Cuba generates a special text file “!!! ALL YOUR FILES ARE ENCRYPTED !!!.TXT” and puts it into all folders that contain the modified files.

Here is a short info for the Cuba :
Ransomware family2 BURAN ransomware
Extension .cuba
Ransomware note !!! ALL YOUR FILES ARE ENCRYPTED !!!.TXT
Ransom From $100 (in Bitcoins)
Contact happy_sysadmin@protonmail.ch
Detection3 Win32/Kryptik.FTPN, Trojan:Win32/Ursnif.A!MTB, Trojandownloader.Deyma
Symptoms Most of your files (photos, videos, documents) have a .cuba extension and you can’t open it
Fix Tool See If Your System Has Been Affected by .cuba file virus

This text asking payment is for get files back via decryption key:

cuba virus note

The scary alert demanding from users to pay the ransom to decrypt the compromised data contains these frustrating warnings

The cryptography algorithm used by Cuba is RSA-2048. So, if your files got encrypted with a specific decryption key, which is totally distinct and there are no other copies. The sad reality is that it is impossible to restore the information without the unique key available.

For receiving decryption key the payment should be $100. To obtain the payment details the victims are encouraged by the message to contact the frauds by email (happy_sysadmin@protonmail.ch)

Do not pay for Cuba!

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

I strongly recommend that you do not contact these crooks 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 really 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 computer is surely not a good idea.

How I was infected?

Cuba has a various methods to built into your system. But it doesn’t really matter what method was used in your case.

Cuba ransomware attack

Cuba ransomware attack following a successful phishing attempt.

Nevertheless, these are the common leaks through which it may be injected into your PC:

  • hidden installation along with other apps, especially the utilities that work as freeware or shareware;
  • dubious link in spam emails leading to the Cuba installer
  • online free hosting resources;
  • using illegal peer-to-peer (P2P) resources for downloading pirated software.

There were cases when the Cuba virus was disguised as some legitimate tool, for example, in the messages demanding to initiate some unwanted software or browser updates. This is typically the way how some online frauds aim to force you into installing the Cuba ransomware manually, by actually making you directly participate in this process.

Surely, the bogus update alert will not indicate that you are going to actually inject the Cuba ransomware. This installation will be concealed under some alert mentioning that allegedly you should update Adobe Flash Player or some other dubious program whatsoever.

Of course, the cracked apps represent the damage too. Using P2P is both illegal and may result in the injection of serious malware, including the Cuba ransomware.

To sum up, what can you do to avoid the injection of the Cuba ransomware into your device? Even though there is no 100% guarantee to prevent your PC from getting damaged, there are certain tips I want to give you to prevent the Cuba penetration. You must be cautious while installing free software today.

Make sure you always read what the installers offer in addition to the main free program. Stay away from opening dubious email attachments. Do not open files from the unknown addressees. Of course, your current security program must be always updated.

The malware does not speak openly about itself. It will not be mentioned in the list of your available programs. However, it will be masked under some malicious process running regularly in the background, starting from the moment when you launch your computer.


The message by the Cuba ransomware states the following frustrating information:

!!! YOUR FILES ARE ENCRYPTED !!!

All your files, documents, photos, databases and other important
files are encrypted.
You are not able to decrypt it by yourself! There is only one method
of recovering files it is purchase an unique private key.

Write to happy_sysadmin@protonmail.ch
Your personal ID: XXXXXX

Attention!
 * Do not rename encrypted files.
 * Do not try to decrypt your data using third party software,
   it may cause permanent data loss.

How to remove Cuba virus?

In addition to encode a victim’s files, the Cuba infection has also started to install the Azorult Spyware on system to steal account credentials, cryptocurrency wallets, desktop files, and more.
Reasons why I would recommend GridinSoft4

There is no better way to recognize, remove and prevent ransomware than to use an anti-malware software from GridinSoft5.

Download Removal Tool.

You can download GridinSoft Anti-Malware by clicking the button below:

Run the setup file.

When setup file has finished downloading, double-click on the install-antimalware-fix.exe file to install GridinSoft Anti-Malware on your system.

Run Setup.exe

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

Press “Install” button.

GridinSoft Anti-Malware Install

Once installed, Anti-Malware will automatically run.

GridinSoft Anti-Malware Splash-Screen

Wait for the Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your PC for Cuba infections and other malicious programs. This process can take a 20-30 minutes, so I suggest you periodically check on the status of the scan process.

GridinSoft Anti-Malware Scanning

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

Frequently Asked Questions

How can I open “.cuba” files?

No way. These files are encrypted by Cuba ransomware. The contents of .cuba files are not available until they are decrypted.

.cuba files contain important information. How can I decrypt them urgently?

If your data remained in the .cuba files are very valuable, then most likely you made a backup copy.
If not, then you can try to restore them through the system function – Restore Point.
All other methods will require patience.

You have advised using GridinSoft Anti-Malware to remove Cuba. Does this mean that the program will delete my encrypted files?

Of course not. Your encrypted files do not pose a threat to the computer. What happened has already happened.

You need GridinSoft Anti-Malware to remove active system infections. The virus that encrypted your files is most likely still active and periodically,
runs a test for the ability to encrypt even more files. In addition, these viruses install keyloggers and backdoors for further malicious actions
(example theft of passwords, credit cards) often.

If the guide doesn’t help you to remove Cuba virus, please download the GridinSoft Anti-Malware that I recommended. Also, you can always ask me in the comments for getting help. Good luck!

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References

  1. Ransomware-type infection: https://en.wikipedia.org/wiki/Ransomware
  2. My files are encrypted by ransomware, what should I do now?
  3. Encyclopedia of threats.
  4. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
  5. More information about GridinSoft products: http://gridinsoft.com/products/

About the author

Brendan Smith

Journalist, researcher, web content developer, grant proposal editor. Efficient and proficient on multiple platforms and in diverse media. Computer technology and security are my specialties.

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