SUNJUN Ransomware 🔐 (.SUNJUN File) — Removal Guide

Written by Brendan Smith
The Sunjun virus falls under the VoidCrypt ransomware family. Ransomware of this type encrypts all the data on your PC (photos, documents, excel sheets, music, videos, etc) and adds its specific extension to every file, creating the Read.txt text files in every folder containing encrypted files.
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What is Sunjun virus?

☝️ A strictly accurate designation for the Sunjun would be “a VoidCrypt family ransomware-type malicious agent”.

The renaming will be executed according to the following pattern: [victim_ID](contact_email).Sunjun. In the process of encryption, a file entitled, for example, “report.docx” will be altered to “report.docx.[CW-AR9583604271](sunjun3412@mailfence.com).Sunjun”.

In each directory containing the encrypted files, a Read.txt text file will be found. It is a ransom money memo. It contains information about the ways of paying the ransom and some other information. The ransom note usually contains instructions on how to buy the decryption tool from the racketeers. You can get this tool after contacting sunjun3412@mailfence.com by email. That is it.

Sunjun abstract:
NameSunjun Virus
Ransomware family1VoidCrypt ransomware
Extension.Sunjun
Ransomware noteRead.txt
Contactsunjun3412@mailfence.com
DetectionCrytex.Virus.FileInfector.DDS, Win32/Filecoder.OLC, Malware-Cryptor.InstallCore.5
SymptomsYour files (photos, videos, documents) get a .Sunjun extension and you can’t open them.
Fix ToolSee If Your System Has Been Affected by Sunjun virus

The Read.txt document coming in package with the Sunjun ransomware provides the following dispiriting information:

All your files have been encrypted. If you want to restore them, write us to the e-mail:sunjun3412@mailfence.com
inCase of no answer :sunjun3416@mailfence.com

Write this ID in the title of your message -

send RSAKEY file stored in C:/ProgramData  or other drives in email

Do not rename encrypted files.
Do not try to decrypt your data using third-party software and sites. It may cause permanent data loss.
The decryption of your files with the help of third parties may cause increased prices (they add their fee to our), or you can become a victim of a scam.

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

Sunjun Virus - encrypted .Sunjun files

That is how encrypted “.Sunjun” files look.

How did my computer get infected with Sunjun ransomware?

There are many possible ways of ransomware injection.

Nowadays, there are three most popular methods for hackers to have the Sunjun virus acting in your digital environment. These are email spam, Trojan introduction and peer-to-peer networks.

If you open your inbox and see emails that look like familiar notifications from utility services companies, delivery agencies like FedEx, web-access providers, and whatnot, but whose “from” field is strange to you, beware of opening those letters. They are most likely to have a malware file attached to them. Thus it is even more dangerous to open any attachments that come with letters like these.

Another option for ransom hunters is a Trojan virus scheme2. A Trojan is an object that infiltrates into your PC disguised as something else. For instance, you download an installer of some program you want or an update for some software. But what is unboxed turns out to be a harmful agent that corrupts your data. Since the installation wizard can have any title and any icon, you’d better be sure that you can trust the resource of the things you’re downloading. The best way is to trust the software companies’ official websites.

As for the peer-to-peer file transfer protocols like torrent trackers or eMule, the threat is that they are even more trust-based than the rest of the Internet. You can never guess what you download until you get it. Our suggestion is that you use trustworthy resources. Also, it is a good idea to scan the folder containing the downloaded items with the anti-malware utility as soon as the downloading is done.

How to remove the Sunjun virus?

It is crucial to note that besides encrypting your files, the Sunjun virus will most likely deploy the Azorult Spyware on your PC to get access to credentials to various accounts (including cryptocurrency wallets). The mentioned spyware3 can extract your credentials from your browser’s auto-filling data.

Often tamperers would decrypt few of your files so you know that they do have the decryption tool. Since Sunjun virus is a relatively new ransomware, anti-malware developers have not yet found a way to undo its work. Nevertheless, the decryption tools are constantly updated, so the solution may soon arrive.

Of course, if the evildoers do the job of encrypting victim’s essential files, the hopeless person will probably comply with their demands. However, paying to racketeers gives no guarantee that you’re getting your blocked information back. It is still risky. After receiving the ransom, the racketeers may send a wrong decryption key to the victim. There were reports of criminals simply vanishing after getting the money without even bothering to reply.

The best safety measure 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. Obviously, that might be insufficient. The most important thing could be that file you were working on when it all happened. But at least it is something. It is also wise to scan your drives with the anti-malware utility after the system is rolled back.

There are other ransomware products, besides Sunjun, that work similarly. For instance, Mppn, Uyit, Maos, and some others. The two main differences between them and the Sunjun are the ransom amount and the encoding method. The rest is the same: documents become blocked, their extensions changed, ransom notes emerge in each folder containing encrypted files.

Some lucky victims were able to decrypt the arrested files with the aid of the free tools provided by anti-ransomware specialists. Sometimes the racketeers mistakenly send the decryption key to the victims in the ransom readme. Such an epic fail allows the injured part to restore the files. But of course, one should never expect such a chance. Make no mistake, ransomware is a criminals’ instrument to pull the money out of their victims.

How do I avert ransomware injection?

Sunjun ransomware doesn’t have a superpower, neither does any similar malware.

You can protect your PC from ransomware attack within several easy steps:

  • Never open any emails from unknown senders with strange addresses, or with content that has nothing to do with something you are waiting for (how can you win in a lottery without participating in it?). If the email subject is more or less something you are waiting for, check all elements of the suspicious email with caution. A fake email will surely contain mistakes.
  • Never use cracked or unknown software. Trojans are often spreaded as a part of cracked products, most likely under the guise of “patch” which prevents the license check. But potentially dangerous programs are very hard to tell from reliable ones, as trojans sometimes have the functionality you need. You can try searching for information on this software product on the anti-malware forums, but the best solution is not to use such software.
  • And finally, to be sure about the safety of the objects you downloaded, use GridinSoft Anti-Malware. This software will be a powerful armor for your personal computer.
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 PC.

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 Sunjun 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

🤔 Can I somehow access “.Sunjun” files?

There’s no way to do it, unless the files “.Sunjun” files are decrypted.

🤔 The encrypted files are very important to me. How can I decrypt them quickly?

Hopefully, you have made a copy of those important files. Otherwise, you might try to employ System Restore. The only question is whether you have saved any Restore Points that would be helpful now. There are other ways to beat ransomware, but they take time.

🤔 Will GridinSoft Anti-Malware remove all the encrypted files alongside the Sunjun virus?

Absolutely not! Unlike the ransomware program itself, the encrypted files do not jeopardize your system.

GridinSoft Anti-Malware only deals with real threats. The ransomware that has attacked your device is must be still functional and running scans from time to time to arrest any new files you might create on your computer after the initial attack. As it has already been said, the Sunjun malware comes with the company. It installs backdoors and keyloggers that can take your account passwords by trespass and provide hackers with easy access to your system in the future.

🤔 What to do if the Sunjun virus has blocked my PC and I can’t get the activation key.

If that happened, you need to prepare a flash memory drive with a previously installed Trojan Killer. Use Safe Mode to perform the cleaning. You see, the ransomware starts automatically as the system launches and encrypts any new files created or imported into your system. To stop this process – use Safe Mode, which allows only the vital programs to run upon system start. Consider reading our manual on booting Windows in Safe Mode.

🤔 And what should I do now?

Some of the encrypted data can be located elsewhere.

  • If you sent or received your critical files via email, you could still download them from your online mail server.
  • You might have shared photographs or videos with your friends or family members. Simply ask them to give 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 networks pages, and cloud drives might have all those files as well.
  • Maybe you still have the needed files on your old PC, a portable device, cellphone, external storage, etc.

HINT: You can employ file recovery programs6 to get your lost data back since ransomware encrypts the copies of your files, deleting the authentic ones. In the video below, you can learn how to recover your files with PhotoRec, but be advised: you can do it only after you kill the ransomware itself with an anti-malware program.

Also, you can contact the following official 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 SUNJUN Ransomware & Recover PC

Name: SUNJUN Virus

Description: SUNJUN Virus is a ransomware-type infections. This virus encrypts important personal files (video, photos, documents). The encrypted files can be tracked by a specific .Sunjun 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’s the list of 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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