Remove CryptoJoker Ransomware. Recover .cryptojoker Files

Remove CryptoJoker Ransomware. Recover .cryptojoker Files

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This article aims to help all victims of CryptoJoker to remove the ransomware completely from the infected host and recover encrypted data without paying the ransom to cyber criminals.

A new version of CryptoJoker ransomware has been spotted by security researchers. It differs from the one that has been released in January last year. Now the threat renames corrupted files with the malicious extensions .partially.cryptojoker or .fully.cryptojoker depending on whether it partially or fully encrypts a file.

Encrypted files become unusable until the unique decryption key is applied to the ransomware decryptor. Hackers guide victims how to act further via a ransom note CryptoJoker Recovery Information.txt that is dropped on the system during the infection process. They demand victims to pay a ransom of €100 in Bitcoin in exchange for the decryption key. Keep reading and find out how to remove CryptoJoker ransomware efficiently from the computer so you can recover encrypted data.

Threat Summary

Short DescriptionThe ransomware encrypts files on your computer and displays a ransom message.
SymptomsThe ransomware will encrypt your files and put the extension .cryptojoker once their encryption is finished.
Distribution MethodSpam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by CryptoJoker


Malware Removal Tool

User ExperienceJoin Our Forum to Discuss CryptoJoker.
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.

Technical Details of CryptoJoker Ransomware Virus

CryptoJoker malware belongs to the most destructive group of computer viruses. It is a data locker ransomware that targets frequently used file types so that it can blackmail users into paying a ransom to get the files back.

First, CryptoJoker ransomware drops its payload on the system. The payload starts a malicious executable file named CryptoJoker.exe that triggers the infection process. In order to perform all malicious activities the ransomware may drop or create additional files which are likely to be situated in the following Windows folders:

  • %AppData%
  • %LocalAppData%
  • %ProgramData%
  • %Temp%
  • %System32%
  • %Windows%

Some of these files are usually designed to modify Run and RunOnce registry keys and ensure persistent threat presence on the PC. By adding new value strings to these keys, CryptoJoker crypto virus set an automatic start of its executable file whenever the Windows OS is switched on:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

Moreover, CryptoJoker uses Windows Registry Editor to display its ransom note automatically on the PC screen. The ransom note is dropped on the computer during the infection process, and it contains a message by CryptoJoker’s authors. The file is named CryptoJoker Recovery Information.txt and all it reads is:

Hello, my name is CryptoJoker !!
My name is CryptoJoker. I have encrypted all your precious files including images, videos, songs, text files, word files and e.t.c So long story short, you are screwed … but you are lucky in a way. Why is that ?? I am ransomware that leave you an unlimited amount of time to gather the money to pay me. I am not gonna go somewhere, neither do your encrypted files.
1. Can i get my precious files back ??
Answer: ofcourse you can. There is just a minor detail. You have to pay to get them back.
2. Ok, how i am gonna get them back ?
Answer: You have to pay 100€ in bitcoin.
3. There isn’t any other way to get back my files ?
Answer: Nahhh.
4. Ok, what i have to do then ?
Answer: Simply, you will have to pay 100€ to this bitcoin address: *** . When time comes to send me the money, make sure to include your e-mail and your personal lD(you can see it bellow) in the extra information box (it may apper also as ‘Extra Note’ or ‘optional message’) in order to get your personal decryption key. It may take up to 6-8 hours to take your personal decryption key.
5. What the heck bitcoin is ?
Answer: Bitcoin is a cryptocurrency and a digital payment system. You can see more information here: . I recommend to use ‘Coinbase’ or ‘Bitcoin wallet’ as a bitcoin wallet, if you are new to the bitcoin-wallet. Ofcourse you can pay me from whatever bitcoin wallet you want, it deosn’t really matter.
6. Is there any chance to unclock my files for free ?
Answer: Not really. After 1-2 or max 3 years there is propably gonna be released a free decryptor. So if you want to wait … it’s fine. As i said, i am not gonna go somewhere.
7. What i have to do after getting my decryption key ?
Answer: Simple. Just press the decryption button bellow. Enter your decryption key you received, and wait until the decryption process is done.
Your personal ID: [HWID goes here]

The additional impact caused by CryptoJoker may be usage of the vssadmin delete shadows command that prevents data recovery by means of Shadow Volume Copies.

CryptoJoker Ransomware Virus Payload Distribution

Cyber criminals are always seeking for new ways to trick users into installing malware on their PC. Ransomware attacks like CryptoJoker usually use spam email campaigns for payloads delivery. Such emails generally impersonate legitimate sources like bank or government institutions, Internet providers, courier services and current or past employers. This approach aims to trick users into opening file attachment, clicking displayed button or following presented link without any doubt whether this action will harm their system or not. All these activities can deliver the CryptoJoker ransomware payload on the computer. And once it penetrates the system it can infect it.

Another way of delivery may be freeware programs and pirated content as well. Once hackers inject CrpytoJoker malicious code into an app or a torrent file, it comes bundled with the primary product without asking users for any additional installing permission.

CryptoJoker Ransomware Virus Data Encryption Process

CryptoJoker ransomware initiates a scan of all PC drives in order to find all file types that are predefined as targets in its data encryption list. Like its previous version CryptoJoker is likely to target the following file types:

.txt, .docx, .doc, .xls, .pdf, .java, .jpeg, .sql, .db, .docm, .odt, .csv, .xlsb, .xlsm, .aspx, .html, .psd, .pptx, .mdb, .sln, .xlsx

Whenever a file matches a value set in its list, CrptoJoker is likely to encrypt part of the original file code or the whole file with the AES-256 bit encryption algorithm. This encryption method is used by the previous version of the ransomware that has appeared in January 2016. The code analysis of new CryptoJoker version is in progress so it may be reprogrammed to utilize other cipher algorithms.

At the end of the encryption process, this new strain of CrptoJoker ransomware family appends double extension to the file names. The malicious extensions .fully.cryptojoker is used when the whole file is encoded while the .partially.cryptojoker file extensions rename data with partially corrupted code.

A unique decryption key that is generated during the encryption process is supposed to be useful for .cryptojoker data recovery. The key is possessed by hackers, so they demand € 100 in bitcoins ransom for it. However, beware that they may be bluff just to gain the money. On one hand, there is no guarantee that after ransom payment they will send the decryption key, on the other hand, the ransomware code may be broken in a way to generate useless keys that won’t restore .cryptojoker files.

Remove CryproJoker Ransomware and Restore .cryptojoker Files

For the sake of your security, it is always better to avoid any negotiations with cyber criminals and skip the ransom payment.

It is better to get rid of CryproJoker ransomware by removing all malicious files and objects created on the system. Then back up all encrypted files and attempt to restore .cryptojoker files with the help of alternative data recovery solutions. Follow the step-by-step removal guide below and cope with CryproJoker ransomware by yourself.

Have in mind that the complexity of ransomware code may make the removal of all malicious files and objects associated with CryptoJoker a challenging task even for tech savvy guys. If unsure, use the automatic option below and clean your system right away.


Milena Dimitrova

An inspired writer and content manager who has been with SensorsTechForum for 4 years. Enjoys ‘Mr. Robot’ and fears ‘1984’. Focused on user privacy and malware development, she strongly believes in a world where cybersecurity plays a central role. If common sense makes no sense, she will be there to take notes. Those notes may later turn into articles!

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