.kr3 KRider Virus Remove and Restore Encrypted Files - How to, Technology and PC Security Forum | SensorsTechForum.com

.kr3 KRider Virus Remove and Restore Encrypted Files

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Article created to help you remove the .kr3 file virus from your computer and restore AES-256 encrypted files.

A ransomware infection known as KRider has been spotted in the wild by malware researchers. The virus uses an AES encryption algorithm to encrypt the files on the infected computer. Unlike other ransomware infection, this virus does not drop a ransom note with demands to pay a hefty ransom fee to get your files back. In case you have become a victim of this ransomware infection we advise you to read this article thoroughly.

Threat Summary


.kr3 Ransomware

Short DescriptionThe malware encrypts users files using a strong AES encryption algorithm, making direct decryption possible only via a unique decryption key.
SymptomsThe user may witness ransom notes and “instructions” linking to a web page and a decryptor. Changed file names and the file-extension .kr3 has been used.
Distribution MethodVia an Exploit kit, Dll file attack, malicious JavaScript or a drive-by download of the malware itself in an obfuscated manner.
Detection Tool See If Your System Has Been Affected by .kr3 Ransomware


Malware Removal Tool

User ExperienceJoin our forum to Discuss .kr3 Ransomware.
Data Recovery ToolWindows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

How Does .kr3 File Virus Infect

For the infection process to be successful, this ransomware virus may use e-mail spam messages. Those messages usually contain a convincing statement in them that the attachment to the e-mail is of great importance and should be opened as soon as possible, just like the example image below displays:

Besides this, there are other methods by which this virus can spread. Some of them include fake installers downloaded from shady websites, fake patches downloaded from torrent websites and others.

More Information about .kr3 Ransomware

As soon as the user opens the malicious file, the infection with this virus takes place. It drops two executables on the compromised computer, one named KRider.exe and the other is .exe file with random symbols. The files may be dropped on multiple important Windows folders:

  • %AppData%
  • %Local%
  • %LocalRow%
  • %Roaming%
  • %SystemDrive%

This virus may also modify crucial for Windows settings by adding registry values in the Windows Registry Editor. The usually targeted registry sub-keys are the following:

→ HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

Then the .kr3 virus may also modify some of the important files of Windows with the one and only purpose of remaining undetected on the computer while performing it’s primary purpose – encryption.

The Encryption Process of .kr3 File Virus

The KRider ransomware is a very serious threat when it comes to encryption. The virus takes advantage of an encryption algorithm, known as Advanced Encryption Standard or Rijndael. The cipher is 256 bits in strength and it is very difficult to decode files encoded by it. For the encryption .kr3 ransomware may target Microsoft Office files, OpenOffice files, PDF files, text documents, database files. But the virus may also be preconfigured to encrypt the standard file types that are used often:


The files are encoded by having bytes of them replaced with code from the cipher which makes them no longer able to be opened. After this a unique key is generated and stored on the infected computer. The files have the .kr3 file extension and may appear like the following:

After encryption, the .kr3 ransomware may also perform other activities to further eliminate any option of data recovery. One of those is to attempt and delete the shadow volume copies of the infected computer via executing the privileged vssadmin command in Windows:

What is interesting in this particular case is that the .kr3 ransomware infection does not drop any ransom note, suggesting the virus may still be in development. Whatever the case might be, it is not advisable in any circumstance to look for a way of payment, because it is no guarantee you will get the files back. Instead, removal is highly recommended after backing up the encrypted files.

Remove .kr3 Ransomware Infection and Restore Encrypted Files

For the removal of this ransomware virus, you can go ahead and follow the removal instructions below. They are carefully designed to help you to be rid of this ransomware infection methodologically. In case you lack the experience in performing manual removal, experts often advise users to perform an automatic removal by downloading and installing an advanced anti-malware program.

After already removed the virus files from your computer, our recommendations are to focus on trying several alternative tools for data recovery, decryption and file restoring. They are outlined in step “2. Restore files encrypted by .kr3 ransomware.”


Ventsislav Krastev

Ventsislav has been covering the latest malware, software and newest tech developments at SensorsTechForum for 3 years now. He started out as a network administrator. Having graduated Marketing as well, Ventsislav also has passion for discovery of new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management and then Network Administration, he found his passion within cybersecrurity and is a strong believer in basic education of every user towards online safety.

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