Remove J91D Virus (.J91D Files Ransomware) – Matrix Ransomware

J91D Virus – Details

The J91D stands for a ransomware-type infection. The infection comes from the Matrix ransomware family. J91D was elaborated particularly to encrypt all major file types. Once the file is encrypted people are unable to use them. J91D adds the “.J91D” extension for each file encrypted by it. For example, the file “myphoto.jpg“, as soon as encrypted by J91D, will be renamed into “myphoto.jpg.J91D“. As quickly as the encryption is finished, J91D places a special text file into every folder containing the encrypted data.

The message given by J91D text file requesting for the ransom is absolutely the same as the statements given by other ransomware representatives belonging to the Matrix clan. It actually mentions that the information is encrypted which the only way to restore it is to use a a distinct decryption key. Sadly, this is definitely true. The sort of cryptography mechanism used by J91D is still not appropriately examined. Still, it is definitely certain that each victim might be given the specific decryption key, which is totally unique. It is difficult to restore the files without the key available.

Another trick of J91D is that the victims cannot gain access to the key. The key is saved on a specific server run by the frauds related to J91D ransomware. To get the key and recover the important information people need to pay the ransom.

However, irrespective of the requested amount, people need to stay away from paying the ransom. Cyber frauds are not fair, so they tend to completely ignore what their victims feel about the problem, even when the payment reaches their pockets. This is why paying the ransom typically does not give any positive result and people simply lose their money for absolutely nothing.

We strongly advise that you do not contact these crooks and certainly do not transfer money into their accounts. It is said to admit that there are no utilities able to crack J91D ransomware and to recover the data data for free. Thus, the just right decision is to recover the lost information from the available backup.

Virus Summary

NameJ91D Ransomware
File Extension.J91D
TypeRansomware
FamilyMatrix
Short DescriptionThe ransomware encrypts all the data stored on your system and requires a ransom to be paid on your part supposedly to recover your important files.
SymptomsFile encryption by the ransomware is performed by means of the AES and RSA encryption algorithms. Once the encryption is completed, the ransomware adds its special J91D extension to all the files modified by it.
Distribution MethodSpam Emails, Email Attachments
Similar InfectionsBg85, Nobad, Core
Removal Tool   GridinSoft Anti-Malware

Bear in mind that the world wide web is now overwhelmed with threats that look comparable to J91D ransomware. It is similar Bg85 and many other ransomware-type threats. Malicious programs of such kind are generally elaborated to encrypt important data and to state the demand before the user to pay the ransom. The peculiarity of all such ransomware threats is that all apply a similar algorithm to create the special decryption key for information decryption.

Thus, as long as the ransomware is still being developed or has some hidden bugs, manually recovering the information is simply not feasible. The only method to avoid the loss of your crucial files is to frequently create backups of your important information.

Remember that even if you create such backups, they need to be placed into a special storage utility not connect to your main PC. You may use the USB Memory Stick or external disk drive for this purpose, or refer to the help of the cloud storage. If you store your backup files on your common system they may be encrypted together with other files, so it’s absolutely not a good storage location.

How did ransomware infect my system?

There are a number of ways used by online frauds to distribute J91D ransomware. Despite the fact that it doubts how exactly J91D injects your computer, there are some leaks through which it may penetrate the system:

  • integration with third-party apps, especially freeware;
  • spam emails from unidentified senders;
  • websites rendering free hosting services;
  • pirated peer-to-peer (P2P) downloads.

Frequently J91D ransomware might exist as some legitimate software application, for example, in the pop-ups advising users to implement some crucial software updates. This is the typical trick used by online scams to persuade people into downloading and installing J91D infection manually, by means of their direct participation in the installation process.

In addition, the criminals might describe various email spam strategies to inject malicious codes into PC. So, they may refer to to sending unsolicited spam emails with tricky notices promoting users to download the attachments or click on certain download links, for example, the ones motivating users to open some photos, files, tax reports or invoices.

Needless to mention, opening such documents or clicking on such dangerous links may seriously harm the PC. Fictitious Adobe Flash Player upgrade notifies may result in J91D ransom injection. When it comes to the cracked software, these illegally downloaded programs may also contain malicious codes resulting in J91D secret installation. Lastly, injection of J91D may take place by means of Trojans that privately get injected into the system and set up malicious tools without the user’s authorization.

Is there any method to prevent the injection of J91D ransom virus?

Even though there is no 100% guarantee to prevent your system from getting infected, there are some pieces of advice we want to show with you. Firstly, be extremely cautious when you surf the web and particularly while downloading complimentary apps. Keep away from opening suspicious email attachments, especially when the sender of the email is not familiar to you.

Remember that some freeware installers may consist of other unwanted utilities in the package, so they may be malicious. Make certain that your current antivirus software and your entire OS is always duly updated.

Naturally, downloading pirated software is prohibited and may lead to essential damage to be made for your system. Hence, stay away from downloading cracked software. You are also highly encouraged to reconsider your existing security software and possibly switch to another security solution that can render much better services of defending your computer.

Screenshot of files with “.J91D” extension added by the ransomware:
J91D Ransomware - encrypt files with .J91D extension

Use GridinSoft Anti-Malware to remove J91D ransomware from your computer

1.Download GridinSoft Anti-Malware.

You can download GridinSoft Anti-Malware by clicking the button below:

  GridinSoft Anti-Malware

2. Double-click on the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-ag.exe file to install GridinSoft Anti-Malware on your computer.
GridinSoft Anti-Malware
An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.
GridinSoft Anti-Malware Setup

3. Press Install button for run GridinSoft Anti-Malware.

GridinSoft Anti-Malware Install

3.Once installed, GridinSoft Anti-Malware will automatically run.

GridinSoft Anti-Malware  Start

4. Wait for the GridinSoft Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your computer for Win Speedup 2018 and other malicious programs. This process can take a 20-30 minutes, so we suggest you periodically check on the status of the scan process.
GridinSoft Anti-Malware Scan

5. Click on “Clean Now”.

When the scan has completed, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.
GridinSoft Anti-Malware Scan Result

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About Daniel Zimmermann

Daniel Zimmermann has been writing on security and malware subjects for many years and has been working in the security industry for over 10 years. Daniel was educated at the Saarland University in Saarbrücken, Germany and currently lives in New York.

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