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

removal by Olivia Morelli - - | Type: Ransomware
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Mr. Paul Sütterlin creates Krypta ransomware using HiddenTear’s code

The number of currently available HiddenTear variants just shocks us – apparently, Krypta virus is the latest one of them. Krypta ransomware was developed in March 2017, and it seems that is was created by Paul Sütterlin using Visual Studio 2015. The virus is based on Utku Sen’s dangerous program[1] that was created as a proof-of-concept[2], and it uses AES encryption to lock victim’s files. Originally known as Rijndael[3], this cryptography method is symmetric, and it means that encryption and decryption keys used in the process are identical. The key can be 128, 192 or even 256 bits in length, and it means that it would take years to brute-force it. Obviously, it is not possible to guess the key, either. During the encryption process, Krypta ransomware virus also decorates each encrypted file with a bonus file extension – .enc. This extension is known to be used by RozaLocker and Cryptohasyou viruses. Typical ransomware type viruses then leave a ransom note on the desktop, which urges the computer to the user to pay for the comeback of his own files. It is nothing less than an attempt to extort money from you – do not forget that! According to researchers, Krypta ransomware comes with a useful Decrypt button, which can be used to restore encrypted files. If it works, you should get your files back for free. Until then, we suggest you remove Krypta malware using anti-malware programs, for instance, Reimage or Malwarebytes Anti Malware.

In this case, it seems that Krypta ransomware is not that dangerous; however, if you were infected with a variant that asks you to pay money for data decryption, it means that you were infected with a severe and illegal program that attempts to extort[4] and blackmail you. Typically, such programs promise to delete the decryption key in case the victim fails to pay the ransom within a given time period. To be prepared for ransomware attacks, we suggest you create your data backups beforehand and keep them in a safe place. Using a decent anti-malware solution can prevent ransomware attacks, too, so we suggest installing one ASAP. You can use programs that we recommended using for Krypta removal.

How do such viruses proliferate?

Ransomware is not a Trojan and it does not spread on its own. In order to implement data encryption, one has to install it on the computer system manually. Typically, ransomware viruses reach victims in a form of email attachments, so we always advise computer users to be careful about suspicious emails that contain one or a few attachments because opening them can lead to disastrous consequences. Spam campaigns[5] that distribute ransomware typically deliver a short message that kindly invites the target to view attached contents. If the victim opens them, they might ask one to enable Macros to see the content of the file properly. Once enabled, the Macros activates the malicious script provided in the attachment and it downloads the ransomware from a server that hosts it. However, more sophisticated viruses usually proliferate rapidly because they use advanced distribution methods such as exploit kits and malvertising. the In case of such attacks, only a decent anti-malware software with a real-time protection feature can ward off your computer.

How to remove Krypta ransomware?

Remove Krypta virus using instructions provided below the article. You can use method 1 or method 2 to delete it. Keep in mind that you will need to use an anti-spyware or anti-malware program because it is not advisable to deal with ransomware manually. If your files were corrupted and you can no longer open them, and if the “Decrypt” button doesn’t work, you can try standard data recovery methods explained right below Krypta removal tutorial.

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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 Krypta 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.

More information about this program can be found in Reimage review.

Manual Krypta virus Removal Guide:

Remove Krypta using Safe Mode with Networking

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

To start with, reboot your PC in a Safe Mode with Networking (instructions provided below).

  • 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 Krypta

    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 Krypta removal.

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

Remove Krypta using System Restore

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

  • 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 Krypta. 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 Krypta removal is performed successfully.

Bonus: Recover your data

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

If you cannot open .enc file extension files, use a data backup to recover them or follow instructions provided below.

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

System Restore Point

If you created System Restore Point prior to the infection, you can recreate lost files this way:

  • 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”.

ShadowExplorer help

You can try to restore encrypted files using a tool called ShadowExplorer. It helps to find available Volume Shadow Copies and uses them to restore encrypted files.

  • 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.

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

About the author

Olivia Morelli
Olivia Morelli - Ransomware analyst

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References


  • Gin24

    Well, Paul Sütterlin, youre a naughty boy. Better stop creating that ransomware right now!

  • anabelle

    Why there are so many Hidden Tear copies these days? Has someone published its source code on dark web forums or what?! Seems like script kiddies have so much fun creating stupid viruses.