How to remove Sun ransomware from the operating system

Also Known As: Sun virus
Distribution: Low
Damage level: Severe

Sun ransomware removal instructions

What is Sun?

Discovered by Michael Gillespie, Sun is malicious software categorized as ransomware. This infection performs data encryption and makes ransom demands (i.e., payment for decryption tools/software). When Sun encrypts data, all files are appended with the ".sun" extension. For example, "1.jpg" becomes "1.jpg.sun", and so on for all affected files. After this process is complete, an HTML file ("DECRYPT_INFORMATION.html") is stored in each affected folder.

The HTML file contains the ransom message, which informs victims that all data has been encrypted and can no longer be accessed. The message assures users that this is not a false claim (they are not "bluffing"), since each encrypted file now has the ".sun" extension. To recover the compromised data, victims are informed that they need to follow instructions from the cyber criminals behind Sun malware. Failing to do so will leave their files beyond repair. Decryption instructions are located on a website, which can only be accessed via the Tor browser. The message also provides a link to the download page of the browser. The indicated site features a file upload/download platform - the text states that this is for victims to upload files for a "test" decryption, as 'proof' that data restoration is possible. Further text states that these files cannot exceed 12 MB. Furthermore, to obtain the decryptor (decryption tools and/or keys), users must transfer a specific sum of the Bitcoin cryptocurrency to the criminals' cryptowallet. They are urged to act quickly, since there is a countdown displayed until the cost is doubled. The ransom amount is stated to be 5 BTC, which (at the time of research) is approximately 43.7 thousand USD. This large sum is uncharacteristic of typical ransomware infections and far beyond the financial capability of most average users. Even large companies would refuse to pay, often on principle alone. This substantial ransom demand makes the infection more suspect. Even if the cyber criminals offer to make discounts, you are strongly advised against meeting their demands. Despite paying, victims often receive none of the necessary decryption tools - their data remains encrypted and useless. Unfortunately, in most cases of ransomware attacks, manual decryption without the involvement of the criminals is impossible. Malicious programs of this type use strong encryption and the files they encrypt can only be recovered by them. To prevent Sun from carrying out further file encryption, remove it from the device. Removal will not restore already affected data. The only solution is to restore files from a backup, if one was made prior to the infection and was stored separately.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:

Sun decrypt instructions

All ransomware is designed to encrypt data and demand ransom payments for decryption. NvramRooster865qqGodLock, and CYBORG are some examples of such infections. Each might differ by cryptographic algorithm used (symmetric of asymmetric) and ransom amount. Typically, these sums range between three and four digits (in USD). Digital currencies (e.g. cryptocurrencies, pre-paid vouchers, etc.) are preferred by cyber criminals, since these transactions are difficult/impossible to trace. Unless ransomware is still in development and/or has certain flaws, decryption with third party software is not viable. You are advised to maintain backups on remote servers and/or unplugged storage devices to ensure data safety. Ideally, multiple backup copies should be stored in different locations.

How did ransomware infect my computer?

Ransomware and other malware is mainly proliferated through spam campaigns, trojans, fake software updaters and "cracking" (activation) tools, and via untrustworthy download sources. Spam campaigns are employed to send deceptive emails on a massive scale. The emails are usually disguised as "official", "important", "urgent" and as similar priority mail. They contain dangerous attachments or links leading to infectious files. They might appear in various formats such as archive (ZIP, RAR) and executable (.exe, .run) files, Microsoft Office and PDF documents, JavaScript, etc. When they are opened, they are triggered to begin downloading/installing malware. Trojans are malicious programs that operate by causing chain infections. Fake updaters abuse weaknesses in outdated software and/or install malware, rather than the promised updates. Illegal activation ("cracking") tools infect systems similarly, by downloading/installing malicious programs rather than activating licensed products. Unofficial and free file-hosting websites, Peer-to-Peer sharing networks (BitTorrent, eMule, Gnutella, etc.) and other third party downloaders are untrusted. These download channels are more likely to offer malicious content disguised as, and bundled with, normal software.

Threat Summary:
Name Sun virus
Threat Type Ransomware, Crypto Virus, Files locker.
Encrypted Files Extension .sun
Ransom Demanding Message DECRYPT_INFORMATION.html
Ransom Amount 5BTC (currently worth of approximately 43.7k USD).
Cyber Criminals' Cryptowallet Address 1P47N6sQCf61WmYi8GVZrxuj8HJPGFUrTC
Cyber Criminal Contact Website in Tor network.
Symptoms Cannot open files stored on your computer, previously functional files now have a different extension (for example, my.docx.locked). A ransom demand message is displayed on your desktop. Cyber criminals demand payment of a ransom (usually in bitcoins) to unlock your files.
Distribution methods Infected email attachments (macros), torrent websites, malicious ads.
Damage All files are encrypted and cannot be opened without paying a ransom. Additional password-stealing trojans and malware infections can be installed together with a ransomware infection.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Malwarebytes.
▼ Download Malwarebytes
To use full-featured product, you have to purchase a license for Malwarebytes. 14 days free trial available.

How to protect yourself from ransomware infections

Do not open suspicious or irrelevant emails, especially those received form unknown addresses. Any attachments (or links) found in this mail must never be opened, since these files are the origin of a potential infection. Only official and verified download channels should be used. Program activation and updating should be done with tools/functions provided by genuine developers. Illegal activation ("cracking") tools and third party updaters are a threat to system health. Have a reputable anti-virus/anti-spyware suite installed and kept up-to-date. Furthermore, this software should be employed to perform regular system scans and to remove detected threats/issues. If your computer is already infected with Sun, we recommend running a scan with Malwarebytes for Windows to automatically eliminate this ransomware.

Text presented in Sun ransomware HTML file ("DECRYPT_INFORMATION.html"):

Whats Happen?
We got your documents and files encrypted and you cannot access them. To make sure we're not bluffing just check out your files and see they all are .sun-formatted. Want to recover them? Just do what we instruct you to. If you fail to follow our recommendations, you will never see your files again.
What Guarantees?
We're doing our own business and never care about what you do. All we need is to earn. Should we be unfair guys, no one would work with us. So if you drop our offer we won't take any offense but you'll lose all of your data and files. How much time would it take to recover losses? You only may guess.
How do I access the website?
Get TOR browser here
Go to our website
Once you open the page, follow the steps to restore your files.

Offline HowTo
Copy & Paste this message to this page textarea field


Screenshot of Sun website (Tor browser):

sun ransomware website

Text presented in this page:

Upload any file for test decrypt
Files with a size less than 12Mb

What do you need to do:
In order to get the decryptor you need to send btc to our wallet. The amount and wallet are specified below.
Hurry up! After timer will end, your ransom price will be doubled.
If you want more information on how to buy Bitcoin, you can read it localbitcoins

Amount: 5 BTC
Wallet: 1P47N6sQCf61WmYi8GVZrxuj8HJPGFUrTC
Time left: -

Screenshot of files encrypted by Sun (".sun" extension):

Files encrypted by Sun

Sun ransomware removal:

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Malwarebytes is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
▼ DOWNLOAD Malwarebytes By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Malwarebytes. 14 days free trial available.

Quick menu:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the Sun virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the Sun ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining Sun ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of Sun are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by Sun, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as Sun ransomware.

Note that Windows 10 Fall Creators Update includes a "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default, this feature automatically protects files stored in the Documents, Pictures, Videos, Music, Favorites, and Desktop folders.

Controll Folder Access

Windows 10 users should install this update to protect their data from ransomware attacks. Here is more information on how to get this update and add an additional protection layer from ransomware infections.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove Sun ransomware:

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

Our malware removal guides are free. However, if you want to support us you can send us a donation.

Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
Sun virus QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of Sun virus on your mobile device.
We Recommend:

Get rid of Windows malware infections today:

Download Malwarebytes

Platform: Windows

Editors' Rating for Malwarebytes:
Editors ratingOutstanding!

[Back to Top]

To use full-featured product, you have to purchase a license for Malwarebytes. 14 days free trial available.