How to uninstall C-VIR ransomware?

Also Known As: C-VIR virus
Distribution: Low
Damage level: Severe

C-VIR ransomware removal instructions

What is C-VIR?

C-VIR was discovered by Jakub Kroustek, this malicious software is a part of ransomware family named Dharma. Typically, software of this type encrypts files, changes their filenames and creates and/or displays a ransom note (or notes). C-VIR renames encrypted files by adding victim's ID, email address and appending ".C-VIR" extension to their filenames. For instance, it renames a file named "1.jpg" to "[].C-VIR", "2.jpg" to "[].C-VIR", and so forth. Instructions on how to contact cyber criminals can be found in "FILES ENCRYPTED.txt" text file and displayed pop-up window.

Victims are informed that their files were encrypted, to get instructions on how to purchase a tool that can decrypt them they have to write an email to (or and provide the assigned ID which can be found in a displayed pop-up window. Also, victims are warned not to try to rename encrypted files, or decrypt them with some third party software. It is stated that such actions can cause permanent data loss. Basically, victims supposed to contact cyber criminals and wait for further instructions. Unfortunately, C-VIR's developers are the only ones who have tools that can decrypt files encrypted by it. Another problem is that victims who trust cyber criminals tend to get scammed, they do not receive any decryption tool and/or key even after a payment. Therefore, neither these or other cyber criminals behind ransomware-type programs can be trusted. Since there are no other tools that could decrypt files encrypted by C-VIR, the only way to recover files (prevent data loss) for free is to restore them from a created backup. It is worthwhile to mention that possible further encryptions can be prevented by uninstalling ransomware from the operating system, however, its removal does not make encrypted files accessible (files remain encrypted even after uninstallation of ransomware).

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

C-VIR decrypt instructions (pop-up window)

There are many examples of ransomware-type programs, a couple of them are Velar, ProLock and Gate. Software of this type usually is designed to encrypt data and provide victims with some ransom note (or notes). The main and most common differences usually are the size of a ransom and cryptographic algorithm (symmetric or asymmetric) that ransomware used to lock files. In most cases it is possible to decrypt files without having to use tools that can be provided only by cyber criminals when ransomware is still in a development state and has some bugs, flaws. Unfortunately, it dos not happen often. For this reason users should always have data backed up and keep it on unplugged storage device, or some remote server like Cloud.

How did ransomware infect my computer?

Typically, ransomware and other malware can get installed through spam campaigns (emails), other malicious programs called Trojans, unofficial software download channels, software 'cracking' tools and fake updaters. When cyber criminals use spam campaigns as a tool to spread malware, they send emails that contain some malicious attachment (or website link that is designed to download a malicious file). In most cases they attach some malicious Microsoft Office document, PDF document, archive file (like ZIP, RAR), executable file (like .exe) or JavaScript file. When recipients open/execute that attachment or a file downloaded via included link, they cause installation of ransomware or other high-risk malware. Trojans are programs that can cause chain infections. Simply said, when installed, Trojans can install other programs of this kind. Unofficial software download channels like freeware download websites, free file hosting pages, Peer-to-Peer networks (e.g., torrent clients, eMule), unofficial pages, third party downloaders, and other similar channels can be used as tools to host malicious files. It means that users who open files downloaded through such channels can cause installation of ransomware or other malicious software. Third party installers can cause such installations too. Software 'cracking' tools are programs that supposed to bypass activation of licensed software for free. However, it is common that cyber criminals use them as tools to spread various malware. Simply said, people who use such activators risk to infect their computers with some malware. Fake, unofficial software updaters, if used, can infect computers by installing malicious programs instead of the updates, fixes, or by exploiting bugs, flaws of the outdated software that is installed on them.

Threat Summary:
Name C-VIR virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .C-VIR
Ransom Demanding Message Pop-up window and FILES ENCRYPTED.txt
Cyber Criminal Contact,
Detection Names Avast (Win32:RansomX-gen [Ransom]), BitDefender (Trojan.Ransom.Crysis.E), ESET-NOD32 (A Variant Of Win32/Filecoder.Crysis.P), Kaspersky (, Full List Of Detections (VirusTotal)
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.

To eliminate malware infections our security researchers recommend scanning your computer with Spyhunter.
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How to protect yourself from ransomware infections?

Attachments and website links in irrelevant emails should not be trusted (opened), especially if they are sent from unknown, suspicious addresses. In other words, email contents should be opened only when there is no reason to suspect that it may be unsafe. All software and files should be downloaded from official websites. Third party downloaders, unofficial pages, Peer-to-Peer networks and other channels of this kind can be used as tools to host, distribute malicious files, programs. Updates for installed programs should be downloaded and installed through tools and/or functions that are designed/provided by official developers. The same applies to software activation. Third party activation tools can infect systems with various malicious programs. Besides, it is not legal to use them to activate any licensed software. And finally, computers are safer if they are regularly scanned for threats with antivirus or anti-spyware suite. If your computer is already infected with C-VIR, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in C-VIR ransomware's pop-up window:

Don't worry,you can return all your files!
If you want to restore them, follow this link:email YOUR ID 1E857D00
If you have not been answered via the link within 12 hours, write to us by
Do not rename encrypted files.
Do not try to decrypt your data using third party software, it may cause permanent data loss.
Decryption of your files with the help of third parties may cause increased price (they add their fee to our) or you can become a victim of a scam.

Screenshot of C-VIR's text file ("FILES ENCRYPTED.txt"):

C-VIR ransomware text file (FILES ENCRYPTED.txt)

Text in this file:

all your data has been locked us
You want to return?
write email or

Screenshot of files encrypted by C-VIR (".C-VIR" extension):

Files encrypted by C-VIR ransomware (.C-VIR extension)

C-VIR ransomware removal:

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

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 C-VIR 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 C-VIR 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 C-VIR 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 C-VIR 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 C-VIR, 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 C-VIR 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 C-VIR 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.

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Malware activity

Global malware activity level today:

Medium threat activity

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

QR Code
C-VIR 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 C-VIR virus on your mobile device.
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