SUNJN Ransomware 🔐 (.SUNJN File) — Removal Guide

Written by Brendan Smith
The Sunjn virus belongs to the VoidCrypt ransomware family. Ransomware of this type encrypts all user’s data on the computer (images, text files, excel sheets, audio files, videos, etc) and adds its extra extension to every file, creating the Decryption-guide.txt files in each folder which contains the encrypted files.
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What is known about the Sunjnvirus?

☝️ A strictly correct description for the Sunjn is “a VoidCrypt family ransomware-type malicious agent”.

The renaming will be executed by the following scheme: [id-xxxx](contact_email).sunjn. After the encryption, a file named, for instance, “report.docx” will be altered to “report.docx.[MJ-ML6408927315]([email protected]).sunjn”.

In each directory that contains the encrypted files, a Decryption-guide.txt file will be found. It is a ransom money memo. Therein you can find information on the ways of paying the ransom and some other information. The ransom note usually contains a description of how to buy the decryption tool from the ransomware developers. You can get this decrypting software after contacting [email protected] by email. That is how they do it.

Sunjn outline:
NameSunjn Virus
Ransomware family1VoidCrypt ransomware
Extension.sunjn
Ransomware noteDecryption-guide.txt
Contact[email protected]
DetectionCrytex.Virus.FileInfector.DDS, Win32/Filecoder.OLC, Malware-Cryptor.InstallCore.5
SymptomsYour files (photos, videos, documents) have a .sunjn extension and you can’t open them.
Fix ToolSee If Your System Has Been Affected by Sunjn virus

The Decryption-guide.txt file accompanying the Sunjn ransomware states the following:

Your Files Are Has Been Locked


Your Files Has Been Encrypted with cryptography Algorithm


If You Need Your Files And They are Important to You, Dont be shy Send Me an Email


Send Test File + The Key File on Your System (File Exist in C:/ProgramData example : RSAKEY-SE-24r6t523 pr RSAKEY.KEY) to Make Sure Your Files Can be Restored


Get Decryption Tool + RSA Key AND Instruction For Decryption Process


Attention:

1- Do Not Rename or Modify The Files (You May loose That file)


2- Do Not Try To Use 3rd Party Apps or Recovery Tools ( if You want to do that make an copy from Files and try on them and Waste Your time )


3-Do not Reinstall Operation System(Windows) You may loose the key File and Loose Your Files


Your Case ID :-


OUR Email    :[email protected]


 in Case of no answer: [email protected]

In the picture below, you can see what a folder with files encrypted by the Sunjn looks like. Each filename has the “.sunjn” extension added to it.

Sunjn Virus - encrypted .sunjn files

An example of encrypted .sunjn files.

How did Sunjn ransomware end up on my PC?

There are many possible ways of ransomware infiltration.

There are currently three most exploited methods for evil-doers to have ransomware acting in your digital environment. These are email spam, Trojan introduction and peer-to-peer networks.

If you open your mailbox and see emails that look just like notifications from utility services providers, postal agencies like FedEx, Internet providers, and whatnot, but whose mailer is unknown to you, be wary of opening those letters. They are very likely to have a malware file enclosed in them. Thus it is even more dangerous to download any attachments that come with emails like these.

Another option for ransom hunters is a Trojan horse scheme2. A Trojan is a program that infiltrates into your PC pretending to be something else. For example, you download an installer of some program you need or an update for some software. But what is unpacked turns out to be a harmful agent that compromises your data. Since the installation file can have any name and any icon, you have to make sure that you can trust the resource of the stuff you’re downloading. The optimal way is to use the software companies’ official websites.

As for the peer file transfer protocols like BitTorrent or eMule, the danger is that they are even more trust-based than the rest of the Web. You can never guess what you download until you get it. So you’d better be using trustworthy resources. Also, it is reasonable to scan the directory containing the downloaded objects with the antivirus as soon as the downloading is complete.

How to remove the Sunjn virus?

It is crucial to inform you that besides encrypting your data, the Sunjn virus will most likely deploy the Azorult Spyware on your machine to get access to credentials to different accounts (including cryptocurrency wallets). The mentioned spyware3 can extract your logins and passwords from your browser’s auto-filling data.

Sometimes tamperers would unblock some of your files so you know that they really have the decryption program. Since Sunjn virus is a relatively new ransomware, security software developers have not yet found a way to undo its work. However, the anti-ransomware instruments are frequently upgraded, so the solution may soon be available.

Of course, if the malefactors succeed in encrypting someone’s critical files, the desperate person will most likely comply with their demands. Despite that, paying to racketeers does not necessarily mean that you’re getting your data back. It is still risky. After getting the ransom, the racketeers may send a wrong decryption key to the victim. There were reports about malefactors just vanishing after getting the money without even bothering to reply.

The optimal solution against ransomware is to have a system restore point or the copies of your critical files in the cloud disk or at least on an external storage. Of course, that might be not enough. Your most important thing could be that one you were working upon when it all went down. But at least it is something. It is also wise to scan your PC for viruses with the anti-malware utility after the OS restoration.

Sunjn is not the only ransomware of its kind, since there are other specimens of ransomware out there that act in the same manner. Examples of those are Mzop, Poqw, Pouu, and some others. The two basic differences between them and the Sunjn are the ransom amount and the encoding method. The rest is the same: files become encoded, their extensions changed, ransom notes appear in each directory containing encoded files.

Some lucky people were able to decrypt the arrested files with the help of the free software provided by anti-malware specialists. Sometimes the racketeers mistakenly send the decoding code to the wronged in the ransom note. Such an extraordinary fail allows the injured part to restore the files. But of course, one should never rely on such a chance. Remember, ransomware is a criminals’ instrument to lay their hands on the money of their victims.

How to avert ransomware injection?

Sunjn ransomware has no endless power, neither does any similar malware.

You can armour your system from ransomware infiltration taking three easy steps:

  • Ignore any emails from unknown mailers with strange addresses, or with content that has nothing to do with something you are waiting for (can you win in a lottery without participating in it?). In case the email subject is likely something you are waiting for, check all elements of the suspicious letter carefully. A hoax email will always contain a mistake.
  • Do not use cracked or unknown software. Trojan viruses are often distributed as a part of cracked software, possibly under the guise of “patch” which prevents the license check. But potentially dangerous programs are very hard to distinguish from trustworthy software, as trojans sometimes have the functionality you seek. Try to find information about this software product on the anti-malware message boards, but the best way is not to use such programs at all.
  • And to be sure about the safety of the files you downloaded, check them with GridinSoft Anti-Malware. This program will be a powerful defense for your system.
Reasons why I would recommend GridinSoft4

There is no better way to recognize, remove and prevent ransomware than to use an anti-malware software from GridinSoft5.

Download Removal Tool.

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

Run the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-fix.exe file to install GridinSoft Anti-Malware on your system.

Run Setup.exe

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

Press “Install” button.

GridinSoft Anti-Malware Install

Once installed, Anti-Malware will automatically run.

GridinSoft Anti-Malware Splash-Screen

Wait for the Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your system for Sunjn infections and other malicious programs. This process can take a 20-30 minutes, so I suggest you periodically check on the status of the scan process.

GridinSoft Anti-Malware Scanning

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

FAQ

🤔 Is it possible to open “.sunjn” files?

Negative. That is why ransomware is so frustrating. Until you decode the “.sunjn” files you will not be able to access them.

🤔 I really need to decrypt those “.sunjn” files ASAP. How can I do that?

Hopefully, you have made a copy of those important files. In case you haven’t, there is still a chance that you do have a Restore Point from some time ago to roll back the whole system to the moment when it had no virus yet, but already had your files. All other solutions require time.

🤔 If GridinSoft deletes the Sunjn malware, will it also delete my files that were encrypted?

Absolutely not! The encrypted files are not harmful, so they won’t be deleted.

GridinSoft Anti-Malware only deals with active viruses. The malware that has attacked your system is must be still functional and running scans from time to time to encode any new files you might create on your PC after the attack. As it has been mentioned above, the Sunjn malware comes with the company. It installs backdoors and keyloggers that can steal your account credentials and provide criminals with easy access to your PC after some time.

🤔 What to do if the Sunjn malware has blocked my PC and I can’t get the activation code.

In such an unfortunate situation, you need to have a flash memory drive with a pre-installed Trojan Killer. Use Safe Mode to do the cleaning. The point is that the ransomware starts automatically as the system launches and encrypts any new files created or imported into your system. To stop this function – use Safe Mode, which allows only the vital applications to run automatically. Consider reading our manual on booting Windows in Safe Mode.

🤔 What can I do right now?

Some of the blocked files can be found elsewhere.

  • If you sent or received your critical files through email, you could still download them from your online mailbox.
  • You may have shared images or videos with your friends or family members. Simply ask them to post those images back to you.
  • If you have initially got any of your files from the Internet, you can try doing it again.
  • Your messengers, social media pages, and cloud drives might have all those files as well.
  • Maybe you still have the needed files on your old computer, a notebook, mobile, memory stick, etc.

HINT: You can employ data recovery utilities6 to retrieve your lost information since ransomware encrypts the copies of your files, removing the original ones. In the video below, you can see how to recover your files with PhotoRec, but be advised: you can do it only after you kill the virus with an anti-malware program.

Also, you can contact the following governmental fraud and scam sites to report this attack:

To report the attack, you can contact local executive boards. For instance, if you live in USA, you can have a talk with FBI Local field office, IC3 or Secret Service.

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Brendan Smith
How to Remove SUNJN Ransomware & Recover PC

Name: SUNJN Virus

Description: SUNJN Virus is a ransomware-type infections. This virus encrypts important personal files (video, photos, documents). The encrypted files can be tracked by a specific .sunjn extension. So, you can't use them at all.

Operating System: Windows

Application Category: Virus

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References

  1. My files are encrypted by ransomware, what should I do now?
  2. You can read more on Trojans, their use and types in the Trojan-dedicated section of GridinSoft official website.
  3. You can read more on spyware variants and nature in the respective section of GridinSoft official website.
  4. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
  5. More information about GridinSoft products: https://gridinsoft.com/comparison
  6. Here are Best Data Recovery Software Of 2023.

About the author

Brendan Smith

I'm Brendan Smith, a passionate journalist, researcher, and web content developer. With a keen interest in computer technology and security, I specialize in delivering high-quality content that educates and empowers readers in navigating the digital landscape.

With a focus on computer technology and security, I am committed to sharing my knowledge and insights to help individuals and organizations protect themselves in the digital age. My expertise in cybersecurity principles, data privacy, and best practices allows me to provide practical tips and advice that readers can implement to enhance their online security.

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