Carcn Ransomware

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

Carcn ransomware removal instructions

What is Carcn?

Carcn was discovered by Jakub Kroustek, it is a ransomware-type malicious program that belongs to Dharma malware family. Developers spread it with a purpose to prevent their victims from accessing files stored on a computer unless a ransom is paid. Carcn is designed to encrypt data, to make it unusable. It also renames every encrypted file by adding the ".id-1E857D00.[].carcn" extension (it contains the victim's ID and email address of cyber criminals who developed Carcn). For example, it renames "1.jpg" to "[].carcn" and so on. It creates two ransom notes, one in a pop-up window and another one in the "FILES ENCRYPTED.txt" text file.

The "FILES ENCRYPTED.txt" text file can be found in folders that contain encrypted files. It says that all files are locked, to restore them it is required to contact cyber criminals via (or email address. Ransom note in a pop-up window says that all victim's data was encrypted due to some security problem with a computer. To get instructions on how to decrypt them victims must send an email to one of the aforementioned addresses, it has to contain the assigned ID. The price of a decryption tool is unknown, however, as stated in this pop-up window, it depends on how fast these cyber criminals are contacted. The payment must be made using cryptocurrency (Bitcoins). Before paying victims can send Carcn's developers one file that they will decrypt for free. It is quite common for ransomware developers to offer a free decryption of some files in order to prove their victims that they have the decryption tool. Additionally, Carcn's victims are warned not to rename any of the encrypted files or to try to decrypt them using some other tools because it may cause permanent data loss. The biggest problem is that most cyber criminals design ransomware-type programs to be 'uncrackable'. These programs cause encryptions that can be decrypted using only a particular decryption tool that only cyber criminals (particular ransomware's developers) have. Unfortunately, there is no free tool that could be capable of decrypting Carcn's encryption. The only way to recover files for free at this moment is to use data backup and to restore all files from there.

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

Carcn decrypt instructions

Majority of ransomware-type programs are designed to operate quite similarly. Some examples of of other computer infections of this type are Recognizer, George Carlin and Btix. As a rule, their main goal is to encrypt data stored on victim's computer and ask to pay a ransom through created ransom notes, displayed pop-up windows and so on. Usually there are two main differences: cryptography algorithm (symmetric or asymmetric) used to encrypt data and price of a decryption tool (or/and key). In most cases decryptions without using the right tools that only cyber criminals have are impossible, unless ransomware has some bugs, flaws, is still in a development state. For these reasons we recommend to have data backups created and to keep them stored on some remote server or unplugged storage device. Otherwise they will be encrypted together with other files that are stored on a computer.

How did ransomware infect my computer?

Usually computer infections (including ransomware) are proliferated through spam campaigns (emails), Trojans, questionable software download sources, fake software updaters and software cracking tools. When cyber criminals use spam campaigns, they send emails that contain malicious attachments (or web links that lead to them). These attachments usually are executables (.exe files), archives like ZIP, RAR, Microsoft Office documents, JavaScript files and so on. If opened, these files download and install ransomware or other computer infections. Trojans are malicious programs that are designed to spread other infections. Once a Trojan is installed, it causes chain infections/downloads and installs other malicious programs. Questionable software download sources such as Peer-to-Peer networks (torrent clients, eMule and other tools of this kind), freeware download websites, free file hosting pages and so on, can be used by to present malicious executable (.exe) or other files as harmless files. By downloading and opening them users usually cause computer infections by themselves. Fake software updaters usually infect systems by exploiting outdated software's bugs, flaws, or by downloading malicious programs instead of updates or fixes. Software 'cracking' tools supposed activate software or operating systems for free. However, there are many cyber criminals who use these tools to spread computer infections too. These tools often download and install malware instead of allowing their users to bypass paid activations.

Threat Summary:
Name Carcn virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .id-[victim's_ID].[].carcn (e.g., .id-1E857D00.[].carcn)
Ransom Demanding Message pop-up window, "FILES ENCRYPTED.txt" text file
Cyber Criminal Contact,
Detection Names (chrome64b.exe)
Avast (Win32:Malware-gen), BitDefender (Trojan.Ransom.Crysis.E), ESET-NOD32 (a variant of Win32/Filecoder.Crysis.P), Kaspersky (, Full List Of Detections (VirusTotal)
Symptoms Can't open files stored on your computer, previously functional files now have a different extension, for example my.docx.locked. A ransom demanding message is displayed on your desktop. Cyber criminals are asking to pay 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 Carcn virus our malware researchers recommend scanning your computer with Spyhunter.
▼ Download Spyhunter
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

How to protect yourself from ransomware infections?

We strongly recommend to avoid opening files that are attached to emails received from unknown/suspicious address and are irrelevant. These emails should be ignored. Download software using official, websites and using direct links. Third party software downloaders and other similar tools that we mentioned above should not be trusted. Same applies to third party (fake) software updaters. Software should be updated using implemented functions or tools provided by official developers only. Do not use third party tools to activate software for free, these tools are illegal and cause installations of malicious programs. Another useful thing is to have a reputable anti-spyware or anti-virus software installed. Make sure that it is always enabled and updated. If your computer is already infected with Carcn, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in Carcn ransomware's pop-up window:

All your files have been encrypted!
All your files have been encrypted due to a security problem with your PC. If you want to restore them, write us to the e-mail
Write this ID in the title of your message 1E857D00
In case of no answer in 24 hours write us to theese
You have to pay for decryption in Bitcoins. The price depends on how fast you write to us. After payment we will send you the decryption tool that will decrypt all your files.
Free decryption as guarantee
Before paying you can send us up to 1 file for free decryption. The total size of files must be less than 1Mb (non archived), and files should not contain valuable information. (databases,backups, large excel sheets, etc.)
How to obtain Bitcoins
The easiest way to buy bitcoins is LocalBitcoins site. You have to register, click 'Buy bitcoins', and select the seller by payment method and price.
Also you can find other places to buy Bitcoins and beginners guide here:
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 Carcn's text file ("FILES ENCRYPTED.txt"):

Carcn text file

Text presented in .txt file:

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

Screenshot of files encrypted by Carcn (".carcn" extension that included email address and ID):

Files encrypted by Carcn

Carcn ransomware removal:

Instant automatic removal of Carcn virus: 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 Carcn virus. 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 Carcn 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 Carcn 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 Carcn 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 Carcn 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 Carcn, 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 Carcn ransomware.

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

Controll Folder Access

Windows 10 users should install this update to protect their data from ransomware attacks. Here's more information on how to get this update and add 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 Carcn ransomware: