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

removal by Olivia Morelli - - | Type: Ransomware

KK_ ransomware encrypts all files, targets non-Estonian computer users as well

KK_ virus, which is also known under Estonian ransomware name, is a severe computer threat. The aim of this computer virus is to blackmail owners of infected computers, stealing important files and asking to pay a ransom. This virus gets inside victim’s computer concealed as a safe file, and starts to encrypt all data using an RSA-1024 encryption key, which is a public one. The private one is the one that can decrypt (restore) data, sadly, this one is kept by cyber criminals on their servers. What is interesting, is that the virus instead of adding ??? file extension only, also appends a KK_ prefix to filenames. To recover encrypted files, the victim is asked to pay a large sum of money – even 4 Bitcoins. Considering that 1 Bitcoin at the time of research was equal to 576 dollars, the entire ransom is 2306 USD. That is a huge ransom, to say at least, and we doubt that many computer users would decide to pay it, no matter how much they want to get their files back. The victim is then asked to send a letter to nown@ruggedinbox.comemail.

The information about the encryption, decryption, and other details related to KK_ malware is provided in KK_ IN YOUR DOCUMENTS.txt file, which the virus creates and saves in the computer after it finishes the encryption procedure. Unlike other crypto-ransomware viruses, this variant addresses the victim in rather a polite way:

Dear man, your computer has been locked by ransomware, your personal files are encrypted, and you have unfortunately “lost” all your pictures, files and documents on the computer.

As always, we suggest victims not to pay the ransom, and not only because crooks demand a large sum of money, but also because no one knows if their decryption tool works if these crooks provide it at all and if it is safe to use it. It might be bundled with additional malicious components that can wreak havoc on the computer system. Besides, paying the ransom helps these criminals to accomplish bigger ransomware projects, initiate more illegal activities and so on. Therefore, we strongly recommend you to fight against cyber criminals by refusing to pay the ransom. You can recover your files from a backup; however, you must remove KK_ ransomware first. For KK_ removal, we advise using Reimage or another reputable malware removal software.

KK_ ransomware leaves this ransom note in victim's computer

Methods used to trick users into installing this malware:

KK_ virus is mainly distributed by utilizing Trojan horse technique. It means that cyber criminals tend to disguise it as a safe file and send it to computer users via email, bundle along safe computer programs and so on. Beware of emails that allegedly come from official organizations that you have nothing in common with. Cyber criminals often try to mask themselves as representatives of well-known and reputable companies, seeking to trick users to open email attachments and infect their computers. Do not fall for these tricks and ignore such letters. If you have doubts about the reliability of such email, feel free to find official contacts of the company online and contact it directly.

This malware might also be spread along fake Java or Adobe software updates. Be aware of the fact that the real developer of these programs has nothing to do with malware. Cyber criminals manage to take legitimate software and add some components to it, which, in this case, install KK_ ransomware on the system.

How do I remove KK_ ransomware?

Do not pay the ransom and remove KK_ virus instead. If you have copies of your files, you can do it without any worries. Remember – do not plug the backup device into the infected PC before uninstalling this malicious software from it; otherwise, files on it will be encrypted as well. To remove KK_ ransomware for good, install and run a good anti-malware program, for instance, Reimage. To learn how to complete KK_ removal, see instructions provided below:

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Manual KK_ virus Removal Guide:

Remove KK_ using Safe Mode with Networking

  • 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 KK_

    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 KK_ removal.

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

Remove KK_ 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 KK_. 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 KK_ removal is performed successfully.

Bonus: Recover your data

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

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

Use Data Recovery Pro to decrypt your files

Install this professional data recovery software and use it to rescue files corrupted by KK_ ransomware. Instructions are provided below.

Try to restore your files using Windows Previous Versions feature

You can restore individual files using Windows Previous Versions feature. Follow these guidelines:

  • 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”.

Use ShadowExplorer to recover your records

You can check whether the virus has deleted Volume Shadow Copies from the system or not. These copies can help you to recover your data. Carry out the following instructions:

  • Download Shadow Explorer (;
  • 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 KK_ 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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  • wang

    Cannot decrypt them. Now what?!

  • Jack

    Screw these criminals, theyre too greedy. Im not gonna pay, although I need my files back. Whatever, let it be. Ill just be more careful from now on. Already installed anti-virus.

  • Sammy

    Oh lordy they want a huge ransom!

    • wheremyfilesat

      yEAH they do. not gonna pay…