Infected with CTB-Locker? Need to decrypt your files?

What is CTB-Locker

CTB-Locker (Curve-Tor-Bitcoin Locker) belongs to the family of ransomware viruses. It is also known as Critroni ransomware. This is also crypto-virus and it uses RSA-2048 encryption to encrypt sensitive files and folders. Usually CTB-Locker encrypts user documents, photos, music and other types of personal information. After this it asks for a ransom in bitcoins (0.3 or $120). CTB-Locker modifies file names and extensions of encrypted files. All affected files get .ctb or .ctb2 extension. There are some methods to decrypt .ctb files that will be shown below. Virus creates 3 files: AllFilesAreLocked.bmp, DecryptAllFiles.txt and randomly named HTML file. This files contain instructions for user to pay the random and decrypt files. CTB-Locker allows to decrypt 2 files for free, to show that decryption is possible. It is quite easy to remove CTB-Locker, but it is much harder to decrypt .ctb (.ctb2) files. Read instruction below to restore your files.

ctb-locker virus

How CTB-Locker infected your PC

CTB-Locker is distributed using fake UPS notification emails with infected attachments. Once user unzips archived document and runs it, user will be shown message, that will ask to enable macros. This macros will download executable file and run it, encryption will start then. CTB-Locker will add .ctb or .ctb2 extension to all encrypted files. In this article you can learn how to decrypt .ctb files and remove CTB-Locker from your computer. The only way to protect your computer from such threats is to use antiviruses with crypto-protection like HitmanPro.Alert with CryptoGuard.

What to do if you are infected with CTB-Locker virus?

First of all don’t panic. Follow these easy steps below.

1. Start your computer in Safe Mode with networking. To do that, restart your computer, before your system starts hit F8 several times. This will stop system from loading and will show Advanced boot options screen. Choose Safe mode with networking option from the options list using up and down arrows on your keyboard and hit Enter.
2. Log in to the system infected with the CTB-Locker virus. Launch your Internet browser and download a reliable anti-malware program and start a full system scan. Once the scan is complete, review scan results and remove all entries detected.

Recommended Solution:

Norton is a powerful removal tool. It can remove all instances of newest viruses, similar to CTB-Locker – files, folders, registry keys.

 

Download Norton*Trial version of Norton provides detection of computer viruses for FREE. To remove malware, you have to purchase the full version of Norton.

Step 2: Remove following files and folders of CTB-Locker:

Remove following registry entries:

Remove following files:

How to decrypt files infected by CTB-Locker (.ctb files)?

Use automated decryption tools

There is ransomware decryptor from Kaspersky that may decrypt .ctb files decryption. It is free and may help you restore files encrypted by CTB-Locker. Download it from this page:

Download Kaspersky RannohDecryptor

There is currently no automated decryption tool for CTB-Locker files, but that doesn’t mean that you need to pay the ransom. We track the topic and will add any new decryption tool available in this part of the article. Now you can try to use manual methods to restore and decrypt .ctb files.

Decrypt .ctb files manually

Restore the system using System Restore

system restore

Although, latest versions of CTB-Locker remove system restore files, this method may help you to partially restore your files. Give it a try and use standard System Restore to revive your data.

  1. Initiate the search for ‘system restore
  2. Click on the result
  3. Choose the date before the infection appearance
  4. Follow the on-screen instructions

Roll the files back to the previous version

Previous versions can be copies of files and folders created by Windows Backup (if it is active) or copies of files and folders created by System Restore. You can use this feature to restore files and folders that you accidentally modified or deleted, or that were damaged (in our case – encrypted by CTB-Locker). This feature is available in Windows 7 and later versions.

windows previous versions

  1. Right-click the file and choose Properties
  2. Open the Previous Version tab
  3. Select the latest version and click Copy
  4. Click Restore

Restore .ctb files using shadow copies

shadow explorer gui

  1. Download and run Shadow Explorer.
  2. Select the drive and folder where your files are located and date that you want to restore them from.
  3. Right-click on folder you want to restore and select Export.
  4. Once the scanning process is done, click Recover to restore your files.

Protect your computer from ransomware

hitmanpro alert with cryptoguard

Most modern antiviruses can protect your PC from ransomware and crypto-trojans, but thousands of people still get infected. There are several programs that use different approach t protect from ransomware and lockers. One of the best is HitmanPro.Alert with CryptoGuard. You may already know HitmanPro as famous cloud-based anti-malware scanner. Check out ultimate active protection software from SurfRight.

Download HitmanPro.Alert with CryptoGuard

Information provided by: Alexey Abalmasov

One comment

  1. I am a professional photographer. A few weeks ago my computer was attacked by CTB-LOCKER the one with the black screen and code KEY. Proven Data Recovery has been able to identify the VARIENT of the virus I have. It is – RSA-2048 CTB-Locker encryption virus.
    They want 2,600 for the decryption of 300 image files that this virus has encrypted on a SD CARD. The computer still reads close to 900mb of data on the card and I have been told by multiple sources that there is a chance my images are still there, but I have had no luck and it’s going to take me quite some time to come up with this money so in mean time I am exploring other options and learning more about computers and code than I would otherwise have never cared to.
    It angers me to no end that people can actually even do this. That they can hurt total strangers in this away. Hurt their jobs. Effect their lives just for the sake of doing so and then dangle our data in front of us so we freak out and jump. I refuse to pay this RANSOM and it is frustrating to no end that the supposed GOOD GUYS want WAY THE HELL MORE!! It’s very backwards to me and does not seem right. It is almost impossible to get a simple strait answer from people in this area and there is a lot of double talk and I have bad a couple people remote access my computer and I see them try things even I have tried.
    The files that are blocked were never on my hard drive. I didn’t even have time to make a hard copy. One moment they were find and the next they were encrypted. I have done 2 system restored and a factory restore and computer has updated protection but the files remain locked on my card.
    Is there any effective decryption for CTB-LOCKER – RSA-2048 CTB-Locker encryption virus
    What are the odds? Is it even worth saving all this money for these people? He did ID the variant. Even that came as a shock. It’s all I have to go on. Maybe, if you think you have a solution for me of course I would be willing to work put pay arrangement but I would need to see at lest SOME proof. Maybe do one or two that I can see. There are 300 on the card and I am really quite desperate for this material, or to be told convincingly and enough times that all hope is lost. I am not at that point yet.
    Thanks for your time
    Sincerely

    Scott

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