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Crypt0 Virus Remove and Decrypt _crypt0 Files

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photo-encrypted-crypt0-ransomware-sensorstechforumA ransomware variant belonging to the Detox ransomware viruses, called Crypt0 Ransomware has appeared recently on the malware radar, using the _crypt0 file extension after encrypting the files of users. The virus is poorly coded and drops a ransom note, named HELP_DECRYPT.TXT. Using the AES encryption algorithm which is a very strong cipher, the virus encrypts the files and generates a unique key to “unlock” them which the user can receive after paying the ransom money. The good news is that there is a decryptor released by demonslay335 – a recognized malware researcher. In this article we will help you remove Crypt0 ransomware and restore _crypt0 encrypted files.

Update! There is now a decryptor tool for this ransomware! The tool was created by the malware researcher Michael Gillespie and can be downloaded from the following link, wrapped inside a .zip archive: StupidDecrypter.

Threat Summary



Short DescriptionThe malware encrypts users files using a strong AES encryption algorithm, making direct decryption possible only via a unique decryption key available to the cyber-criminals. Luckily it is decryptable
SymptomsThe user may witness ransom notes and “instructions” name HELP_DECRYPT.txt.
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 Crypt0


Malware Removal Tool

User ExperienceJoin our forum to Discuss Crypt0 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.

Crypt0 Ransomware – More Information

The Crypt0(zero) virus is a variant of the Detox malware family. It may be distributed via spam e-mail messages that carry a malicious URL or an e-mail attachment. The e-mail attachment may pretend to be a legitimate file, like a payment invoice, a confirmation letter, etc. Other spam methods may include infecting users via dubious web links posted in social media.

After infection, the virus drops an HELP_DECRYPT.txt file:


The file contains a ransom note that aims to convince users into making a ransom payoff for the virus.

The ransomware encodes the user files using a strong AES encryption and adding the _crypt0 suffix after the encryption has been completed, for example:

New Text Document_crypt0.txt

The encrypted files can no longer be opened.

Thankfully now a decryptor for the Crypt0 ransomware has been released, and we have provided instructions below to help you remove it and restore your files for free instead of having to pay a hefty ransom payoff.

Remove Crypt0 Ransomware

Before having your files decrypted, it is an important action to remove the virus and other malware to make your computer safe. The best ways to remove Crypt0 ransomware are outlined in the removal instructions below. The most efficient and fastest of them according to malware analysts is scanning your computer with an advanced anti-malware program that will make sure all related files to Crypt0 are permanently gone and secure your PC in the future.


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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