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Crypt12 ransomware virus. How to remove? (Uninstall guide)

removal by Lucia Danes - - | Type: Ransomware
12

Crypt12 ransomware is decryptable

Background picture by Crypt12 ransomware

Crypt12 emerged on the 12th of August operating like a file-encrypting virus.[1] Malware is designed to add filename.extension=id=email.crypt12 file extension to the targeted files. However, cyber security specialists managed to crack ransomware’s code and offered a free decryption software.

Crypt12 is written in .NET[2] programming language and is executed from the crypt12.exe file. Typically, ransomware attacks devices via RDP.[3] On the affected device it not only encrypts files but also replaces desktop's picture.

The new background image informs about encrypted data and provides the contact email message. In order to get back access to the files, victims have to send an email to mortalis_certamen@aol.com and wait for the data recovery instructions.

However, doing that is not recommended or needed. Users can restore files using free and safe decryption software. But before data recovery, you have to remove Crypt12 from the computer. While ransomware resides on the system, your files might be encrypted every time you turn on the computer.

Therefore, you should obtain reputable malware removal tool and go for automatic Crypt12 removal. We suggest completing this task with Reimage. The instructions how to install and run full system scan are provided at the end of the article.

New version of Crypt12 emerged on November

Cyber criminals released a new variant of Cryp12 at the end of autumn 2017. However, this variant also appends .crypt12 file extension to the targeted data and gives the same data recovery instructions. However, this time crooks leave another contact email address – hello@boomfile.ru or hernansec@protonmail.ch.

Malware is installed in PDB: C:\Projects\crypt12\crypt12\obj\Release\KristinaCS.pdb directory and ran from KristinaCS.exe. Due to the name of executable, this version of the virus is also known as Kristina ransomware virus.

However, this variant is also decryptable. Thus, you should remove Crypt12 from the computer and download free decryption software without hesitation.

Malware spreads via insecure RDPs

Malware is expected to spread and attack devices using Remote Desktop Protocol (RDP).[4] However, crooks might also take advantage of the most popular ransomware distribution method – malspam. Thus, you should be careful with suspicious or unexpected emails that show up in your inbox and do not open any content provided in them.

Crypt12 has been spotted affected several devices in the United States. However, it might continue spreading in European countries, including Norway,[5] Hungary, and the UK.

Crypt12 ransomware removal and data recovery.

Crypt12 removal is performed using reputable malware elimination software only. We recommend installing Reimage or Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus and let one of these tools to wipe out malicious components from the system.If you cannot install or run security software, please check the instructions below. They will help to disable the virus and get rid of it.

Once you remove Crypt12, you can download the official decryption software from here. However, if some of the files are still corruted, you should check alternative recovery methods presented below.

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What to do if failed?
If you failed to remove infection using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to uninstall Crypt12 ransomware virus. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.
More information about this program can be found in Reimage review.
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Manual Crypt12 virus Removal Guide:

Remove Crypt12 using Safe Mode with Networking

If Crypt12 prevents from installing malware removal software, please follow these steps to disable malware first.

  • Step 1: Reboot your computer to Safe Mode with Networking

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Safe Mode with Networking from the list Select 'Safe Mode with Networking'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Networking in Startup Settings window. Select 'Enable Safe Mode with Networking'
  • Step 2: Remove Crypt12

    Log in to your infected account and start the browser. Download Reimage or other legitimate anti-spyware program. Update it before a full system scan and remove malicious files that belong to your ransomware and complete Crypt12 removal.

If your ransomware is blocking Safe Mode with Networking, try further method.

Remove Crypt12 using System Restore

  • Step 1: Reboot your computer to Safe Mode with Command Prompt

    Windows 7 / Vista / XP
    1. Click Start Shutdown Restart OK.
    2. When your computer becomes active, start pressing F8 multiple times until you see the Advanced Boot Options window.
    3. Select Command Prompt from the list Select 'Safe Mode with Command Prompt'

    Windows 10 / Windows 8
    1. Press the Power button at the Windows login screen. Now press and hold Shift, which is on your keyboard, and click Restart..
    2. Now select Troubleshoot Advanced options Startup Settings and finally press Restart.
    3. Once your computer becomes active, select Enable Safe Mode with Command Prompt in Startup Settings window. Select 'Enable Safe Mode with Command Prompt'
  • Step 2: Restore your system files and settings
    1. Once the Command Prompt window shows up, enter cd restore and click Enter. Enter 'cd restore' without quotes and press 'Enter'
    2. Now type rstrui.exe and press Enter again.. Enter 'rstrui.exe' without quotes and press 'Enter'
    3. When a new window shows up, click Next and select your restore point that is prior the infiltration of Crypt12. After doing that, click Next. When 'System Restore' window shows up, select 'Next' Select your restore point and click 'Next'
    4. Now click Yes to start system restore. Click 'Yes' and start system restore
    Once you restore your system to a previous date, download and scan your computer with Reimage and make sure that Crypt12 removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove Crypt12 from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by 2-spyware.com security experts.

If your files are encrypted by Crypt12, you can use several methods to restore them:

Data Recovery Pro – professional software that can help to restore files

Data Recovery Pro helps to restore files after system wreckage or accidental deletion. However, it might help after ransomware attack too.

Windows Previous Versions feature

If System Restore has been enabled before the Crypt12 attack, you can access individual files by following the steps below: 

  • Find an encrypted file you need to restore and right-click on it;
  • Select “Properties” and go to “Previous versions” tab;
  • Here, check each of available copies of the file in “Folder versions”. You should select the version you want to recover and click “Restore”.

Try ShadowExplorer for data recovery

If malware failed to delete Shadow Volume Copies of the targeted files, this tool can help you to get back your files without paying the ransom.

  • Download Shadow Explorer (http://shadowexplorer.com/);
  • Follow a Shadow Explorer Setup Wizard and install this application on your computer;
  • Launch the program and go through the drop down menu on the top left corner to select the disk of your encrypted data. Check what folders are there;
  • Right-click on the folder you want to restore and select “Export”. You can also select where you want it to be stored.

Crypt12 decryptor

You can download a free and safe to use Cryp12 Decrypter from this link.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from Crypt12 and other ransomwares, use a reputable anti-spyware, such as Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Malwarebytes Anti Malware

About the author

Lucia Danes
Lucia Danes - Virus researcher

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References