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CryptoKill Ransomware Remove and Restore .crypto Files

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Article, created to help you remove CryptoKill ransomware and restore files encrypted with the .crypto file extension by it on your PC.

The file encryption ransomware virus segment has brought to us another “child”, called CryptoKill. The virus uses .crypto file extension which it adds to the computer which has been infected. The virus also drops a ransom note, named CRYPTOKILL_README.txt which aims to notify the victim that they must pay a hefty ransom fee to get the encrypted files back. In case you have become a victim of CryptoKill, our advice is to read the following article and learn how to remove CryptoKill ransomware from your computer and try to get back the files that cannot be opened.

Threat Summary



Short DescriptionThe malware encrypts users files using a strong encryption algorithm, making direct decryption possible only via a unique decryption key available to the cyber-criminals.
SymptomsThe user may witness ransom notes and “instructions” linking to a web page and a decryptor. Changed file names and the file-extension .crypto 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 CryptoKill


Malware Removal Tool

User ExperienceJoin our forum to Discuss CryptoKill.
Data Recovery ToolStellar Phoenix Data Recovery Technicians License(Pro version with more features) 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.

CryptoKill Ransomware – In-Depth Analysis

CryptoKill is a virus that is of the file encryption kind. Once infected a given system, it makes the files on it no longer able to be opened. It is distributed all over the world, information on infection rate not available.

CryptoKill Ransomware – Infection Process

To cause an infection, CryptoKill ransomware uses different combination of tools. In addition to those tools, this ransomware virus may also use deceptive e-mails or other type of messages which could be used for a very specific purpose – to trick an unsuspecting victim that does not have much experience into opening a malicious web link sent on the mail or an e-mail attachment.

These objects are usually malicious and cause the infection by having a combination of different scripts and tools embedded in them, such as distribution malware (downloader), exploit kits and other type of malware and obfuscators that hide the infection activity from any protection software.

The cyber-criminals also have a pre-chosen list of potential victim e-mails to which the spammed e-mails are sent via spamming software. The spamming software also has a pre-set list of disposable e-mails it uses to avoid being flagged by performing simultaneous spam.

Once the misguided user clicks on an attachment or a URL, by believing the deceitful message on the e-mail, he or she immediately becomes infected and the CryptoKill virus drops the following files on the computer:

  • CryptoKill.exe

CryptoKill Ransomware – Post-Infection Activity

Once an infection by CryptoKill ransomware has been performed, the virus begins to modify the settings on the machine which it has infected. CryptoKill ransomware may create registry values with custom data in the following Windows Registry Sub-Keys:

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

After this has happened, the CryptoKill ransomware may begin encrypting the files. The virus uses an encryption cipher known as AES (Advanced Encryption Standard) to render the files on the infected computer no longer able to be opened. The files have the .crypto file extension and may appear like the following:

Remove CryptoKill Ransomware and Restore Encrypted Files

For the Removal of this ransomware virus, advices are to focus on following the removal manual below. In case you are experiencing difficulties or lack the experience in manually removing CryptoKill from your computer, we recommend you to follow the automatic removal instructions and download an advanced anti-malware program which will make sure that you remove the CryptoKill threat automatically from your computer.

To get the files back, unfortunately this ransomware virus performs a so-called broken encryption which equals to a very low chance of decrypting the files. However, there are other alternative, methods of encoding files encrypted this way and we have mentioned them below on step “2. Restore files encrypted by ChryptoKill” below.


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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