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CryptoJoker ransomware. How to remove? (Uninstall guide)

removal by Jake Doevan - - | Type: Ransomware
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CryptoJoker ransomware is a true menace to your computer

CryptoJoker ransomware

CryptoJoker is a name of a ransomware virus that damages personal files stored on computers. The virus first emerged in 2016[1], but in July 2017, CryptoJoker 2017 ransomware virus emerged. Both viruses seek to encrypt files on victim's computer to demand a ransom.

As much as we know, the initial CryptoJoker seeks to infect files with extensions such as .txt, .docx, .doc, .xls, .pdf, .java, .jpeg, .sql, .db, .docm, .odt, .csv, .xlsb, .xlsm, .aspx, .html, .psd, .pptx, .mdb, .sln, .xlsx, and many more. The virus encrypts these files using the AES-256[2] encryption algorithm. After the file gets encrypted, this ransomware adds a .crjoker extension to the filename.

If you have noticed that your files have changed their names in such way, you should immediately take actions to stop this deadly virus! For that, we STRONGLY recommend using a reputable anti-malware software, for instance, Reimage or any other reliable one.

Keep in mind that once CryptoJoker virus encrypts these files, you will not be able to access them anymore. Crypto Joker leaves messages in the folders that hold the encrypted files as .txt or .html documents. The message states that the personal records were encrypted, and to retrieve them, user needs to contact CryptoJoker developers by sending an e-mail letter to them:

Write to us at mail: file987@sigaint.org

Spare mails: file9876@openmail.cc or file987@tutanota.com.

Instructions for payment will be sent in the opposite letter.

As you can see, this terrible computer threat demands to pay a ransom to retrieve the encrypted files back. Surprisingly, this machine threat does not demand a fixed amount of money, and that gives an idea that the cybercriminals are ready for a negotiation. However, security vendors do not recommend paying the ransom, because there is no guarantee that you will get your files back. Plus, do you wish to support cyber-criminals so that they can continue their knavish activities?

2017 brings another version of CryptoJoker

In June 2017, malware analysts spotted a CryptoJoker 2017 ransomware virus making rounds on the Internet. It was dubbed identically as the malware that emerged in 2016, but to distinguish both viruses, a year of the first appearance was added. The ransomware encodes files but experiences problems when trying to corrupt files that are opened by the user.

The ransomware checks .txt and .md files' sizes with FileInfo.Length property, and encrypts large files partially. The virus marks these files with .partially.cryptojoker extensions. For smaller files of the same types, the malware uses a .fully.cryptojoker extension. The rest of files get encrypted partially and get corresponding file extensions.

The developer of the ransomware has published the ransomware code online, stating that it was created “for education purposes only.” Such statement is a complete nonsense since script kiddies can quickly take that code and convert the ransomware into a fully working extortion tool. If you accidentally got infected with this ransomware, we strongly suggest using anti-malware software to remove CryptoJoker 2017 as soon as possible.

Tricks used to spread the ransomware

In most of the cases, this or any other ransomware viruses are distributed via harmful e-mail attachments. Ransomware is spread like Trojans – mostly, these viruses pretend to be a safe file to convince the user to download and open it. According to VirusActivity[3] research, the described virus is spread as a PDF file. However, you can also infect your computer with this virus by browsing insecure websites or clicking on corrupted links. We have some tips how you should prevent installing CryptoJoker ransomware:

  • Do not browse through suspicious web sources – there is a chance you might click on an infected link and download a computer threat without realising that.
  • NEVER OPEN e-mails AND attachments from senders that you DO NOT personally know! Also, do not open suspiciously looking e-mails, because some viruses tend to take over victim’s e-mail and forward the infected letter to victim’s contacts.
  • Install software safely. Some programs tend to promote third-party freeware in an indirect way, so you have to be careful when installing new apps. Select either Advanced or Custom installation settings and opt-out any suspicious or unfamiliar attachments.

Remove CryptoJoker and try existing data recovery tools

You can remove CryptoJoker virus on your own, but you will need to use an anti-malware software to complete this task. It is highly advisable not to attempt to delete the ransomware manually because you can never know what files and programs it brought into your system. Leave this task for a professional anti-malware tool that can detect potentially dangerous files automatically.

Before you begin CryptoJoker removal procedure, take a look at instructions provided below. They are designed to help you to delete the malware from the system. See, some ransomware viruses are made to block anti-malware programs, and our guide explains how to bypass this obstacle.

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What to do if failed?
If you failed to remove infection using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to uninstall CryptoJoker ransomware. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.
More information about this program can be found in Reimage review.
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Manual CryptoJoker virus Removal Guide:

Remove CryptoJoker using Safe Mode with Networking

Use the provided instructions to remove CryptoJoker while in 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 CryptoJoker

    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 CryptoJoker removal.

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

Remove CryptoJoker 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 CryptoJoker. 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 CryptoJoker removal is performed successfully.

Bonus: Recover your data

Guide which is presented above is supposed to help you remove CryptoJoker from your computer. To recover your encrypted files, we recommend using a detailed guide prepared by 2-spyware.com security experts.

At the moment of writing, there are no verified ways to completely recover the lost files unless you have backups. However, you can still try one of the following tools to recover the files – some people say that they have helped them. You can find some useful tips below.

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

Run Data Recovery Pro tool

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Running Data Recovery Pro on your computer allows you to detect compromised files. The tool may or may not be capable of restoring them.

Use Volume Shadow Copies

Volume Shadow Copy Service is available on Microsoft Windows. It helps to recover lost, corrupted or damaged files using their previous versions.

  • Download Shadow Explorer (http://shadowexplorer.com/);
  • 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.

Crypto Joker decryption tools are not available yet

Neither CryptoJoker or CryptoJoker2017 have official decryption tools released yet. As soon as they appear on the market, the article will be updated.

Finally, you should always think about the protection of crypto-ransomwares. In order to protect your computer from CryptoJoker and other ransomwares, use a reputable anti-spyware, such as Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Malwarebytes Anti Malware

About the author

Jake Doevan
Jake Doevan - Computer technology expert

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  • monique

    frightening! hope I will never get infected with this… so scary!

    • Rizabel98

      I feel ya. Making a research on ransomware viruses and all I can say is that I am surprised how many people actually pay the ransom… for nothing.

      • Nastya

        I dont believe that cyber criminals give the files back. whats the point for them? they already got the money, why spend time trying to help the poor victim?! this is so disgusting! what these criminals do is simply unacceptable…

  • seloutarou

    my cousin was infected with this, poor guy… he didnt manage to get the files back at the end. hideous cyber criminals! god damn it…. hope one day they will be put behind the bars!!