.sVn file extension virus. How to remove? (Uninstall guide)

removal by Gabriel E. Hall - - | Type: Ransomware
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.sVn virus – an updated version of Jaff ransomware

The image of .sVn file extension virus

.sVn file extension virus is a new variant of the Jaff ransomware, also known as Jaff Decryption system. The virus uses a combination of RSA and AES-128-CBC algorithms to encode files on the affected computer. Malware appends the .sVn file extension to each of the 400 different targeted files. Following data encryption, it downloads !!!!README_FOR_SAVE FILES.txt file where cyber criminals offer to purchase decryptor for $300.

Usually, malware arrives on the computer with the help of malicious spam emails. On the affected computer, malware modifies Windows Registry in order to run with Windows startup and launch the most important task – data encryption. Once it’s done, the virus starts scanning the system looking for targeted files.

Nevertheless, .sVn ransomware aims at 400 different file types; it prioritizes what to encrypt first. Malware starts with Microsoft Office documents, various image, audio, video, and other popular files. For data encryption, ransomware uses a strong combination of RSA and AES ciphers[1] and appends .sVn file extension. As a result, victims cannot open or use their files. In order to get back access to the encrypted data, people have to obtain a private decryption key.

Following data encryption, malware drops a ransom note on the desktop and each of the folders that include encrypted files. In the !!!!README_FOR_SAVE FILES.txt cyber criminals provide a unique victim’s ID, briefly presents data recovery instructions and asks to visit a payment website.

The payment site resembles Locky’s website a lot. However, these two cyber threats are not related. In the website, cyber criminals present Jaff Decryptor and offer to use it for $300. Victims are asked to transfer this sum of money in Bitcoins and recommend links where they can buy an alternative currency. The site also gives detailed explanation how to make the transaction and use decryption software.

Unfortunately, if victims do not have backups, their chances to restore files are low. Malware is designed to delete Shadow Volume Copies of the targeted files that are crucial for data recovery. However, paying the ransom may not end up as expected. Victims might experience another malware attack or lose the money. Cyber criminals may take the money and leave the files encrypted. Thus, it’s better to remove .sVn file extension virus and look up for alternative ways to restore files.

Ransomware virus might inject malicious codes into various system processes or install malicious files. It may also open a backdoor to other malware. Thus, delaying .sVn removal is not recommended because it may lead to even bigger problems. The safest way to terminate virus and all its components from the computer is to employ a professional security program, such as Reimage.

Crypto-malware may enter the system after clicking on a malicious email attachment

.sVn virus mostly spreads via malicious spam emails. Such emails include an infected attachment or link that leads to the dangerous web site. Cybercriminals use social engineering techniques to trick users into clicking a malicious content. Usually, crooks use the name of well-known companies, such as FedEx or Amazon. Thus, people rarely suspect something shady.

However, phishing emails might be identified[2]. Before rushing to open an unknown email attachment, you should:

  • double-check the information about the sender;
  • look up for grammar, spelling, and use of language mistakes;
  • review the signature;
    be critical and think whether you should have received such email at the first place.

Removal of the .sVn file extension virus

.sVn removal has to be performed using reputable malware removal program, such as Reimage, Plumbytes Anti-MalwareWebroot SecureAnywhere AntiVirus or Malwarebytes Anti Malware. Trying to locate and delete ransomware-related files and components is not recommended because it may lead to irreparable system damage. Thus, in order to avoid more problems, you should rely on professional software.

Before installing security program, you may need to reboot the computer to the Safe Mode with Networking. It helps to disable the virus if it prevents from downloading or accessing malware removal tool. When in Safe Mode, you have to run a full system scan several times.

Once you remove .sVn malware from the system, you can use backups or try alternative data recovery methods presented below.

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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 .sVn file extension virus. 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.

More information about this program can be found in Reimage review.

Manual .sVn virus Removal Guide:

Remove .sVn using Safe Mode with Networking

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

If you cannot run automatic .sVn removal, reboot your computer to the Safe Mode with Networking and try again. 

  • 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 .sVn

    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 .sVn removal.

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

Remove .sVn using System Restore

Reimage is a tool to detect malware.
You need to purchase Full version to remove infections.
More information about Reimage.

This method also helps to disable the virus in order to remove it automatically.

  • 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 .sVn. 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 .sVn removal is performed successfully.

Bonus: Recover your data

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

Currently, the only safe way to restore files is to use backups. However, if you do not have them, you should try to recover at least some of your files using the suggested methods below.

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

Recover files encrypted by .sVn file extension virus using Data Recovery Pro

This professional software is created to recover files that have been deleted, corrupted or encrypted. Thus, it may help you as well. 

Take advantage of Windows Previous Versions feature

If System Restore function has been enabled before the ransomware attack, you can follow the steps below and recover previously saved versions of files. 

  • Find an encrypted file you need to restore and right-click on it;
  • Select “Properties” and go to “Previous versions” tab;
  • Here, check each of available copies of the file in “Folder versions”. You should select the version you want to recover and click “Restore”.

.sVn decryptor is not available yet

We do not recommend obtaining Jaff Decryptor for data recovery. Dealing with cyber criminals may lead to money loss. Thus, you should be patient and wait for the official decryptor.

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

About the author

Gabriel E. Hall
Gabriel E. Hall - Passionate web researcher

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References