.Karl Virus

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This page aims to help you remove .karl for free. Our instructions also cover how any .karl file can be recovered.


.Karl is a ransomware that encrypts users’ computer, making them unreadable. All relevant personal files are encrypted with a custom extension and users are left with a message asking for a ransom payment to return the files.


An example of .karl’s encryption.

In case that a cryptovirus called .karl has secretly encrypted your files, and has asked you to pay a ransom for their decryption, you must be wondering about what to do. There may be an option, though, and the following removal guide may assist you with avoiding the ransom payment, and removing the infection from your system.

Unfortunately, what you have been infected with is a very hazardous cryptovirus from the Ransomware family that makes it impossible to open your files by applying a powerful encryption to them. This is why we’ve prepared a special removal guide below, to assist with the removal of .karl in the best possible way. In the next lines, you will find a set of instructions on how to detect and remove the infection, as well as some file-recovery suggestions, that do not involve paying a ransom to the hackers behind the Ransomware. Keep in mind, though, that threats of this category are very challenging to deal with, and you may need more than just a removal guide to effectively minimize the consequences of their attack. So, please spend a couple of minutes reading the information that follows, in order to gain a better understanding of the risks and the possible solutions.

The .karl virus

The .karl virus is a ransomware that hijacks users by placing a trojan in their system. The trojan slowly starts encrypting files with the eponymous .karl extension, making them inaccessible without the encryption key.

In contrast to other malware types, which try to remain hidden for as long as possible in the system, .karl uncovers itself immediately after it has completed the encryption process. It typically does that by displaying a ransom note on the screen, right after all the files have been secured with a powerful and secret algorithm. The ransom note informs the victims that without a special decryption key, they cannot access their files, and asks them to pay a certain amount of money for that key. Unfortunately, this special decryption key is in the hands of the hackers, and they typically ask for a lot of money in order to send it to the victims. What is really bad about the whole situation is that there is no other way to unlock your files and reverse the encryption. An error message will appear every time you attempt to open them, and no software will be able to recognize them. And this is the reason why the cyber criminals may get quite harsh when they start blackmailing you to pay them to decrypt your files. They may give you a short deadline to transfer the money, or threaten to double the ransom amount, or even destroy the decryption key if you don’t fulfill their demands. The idea is to manipulate you, and make you act impulsively, without giving yourself time to research your alternatives.

The .karl files

Any .karl files signify an encryption algorithm places by a ransomware on the user’s files. They are easily recognizable because they have a double extension, e.g. example.jpeg.karl.

Many users get panicked from the fact that they can’t access their files, and let the hackers’ ransom demands intimidate them. However, paying the ransom hides a lot of risks, and often leaves them with empty pockets and files that are still inaccessible. In fact, many Ransomware victims never get the “promised” decryption key form the hackers, despite having paid all the ransom money the blackmailers had demanded. That’s because the crooks either disappear with the money or simply “forget” to send anything back. Of course, there are cases where the hackers do send a decryption key to the victims, but there are also many instances where that key proves utterly ineffective, and fails to decrypt the files. At the same time, once the hackers have compromised the computer, and the Ransomware is active in it, nothing can prevent them from causing even more harm. This is why cleaning up the infection is the first move to be taken, rather than making the criminals richer. You can find out exactly how to do this in the removal guide below, and safely remove .karl from your device.

The .karl ransomware

.karl is the latest ransomware of the djvu ransomware strain and exhibits the same symptoms as the rest of its family. What is notable is that the .karl ransomware’s trojan still remains in the user’s system, leaving the files to fall back again to the ransomware.


Name .karl
Type Ransomware
Danger Level High (Ransomware is by far the worst threat you can encounter)
Symptoms Very few and unnoticeable ones before the ransom notification comes up.
Distribution Method From fake ads and fake system requests to spam emails and contagious web pages.
Data Recovery Tool Currently Unavailable
Detection Tool

Remove .karl


Some of the steps will likely require you to exit the page. Bookmark it for later reference.

Reboot in Safe Mode (use this guide if you don’t know how to do it).



Press CTRL + SHIFT + ESC at the same time and go to the Processes Tab. Try to determine which processes are dangerous. 


Right click on each of them and select Open File Location. Then scan the files with our free online virus scanner:

Drag and Drop Files Here to Scan
Maximum file size: 128MB.

This scanner is free and will always remain free for our website's users. You can find its full-page version at: https://howtoremove.guide/online-virus-scanner/

Scan Results

Virus Scanner Result

After you open their folder, end the processes that are infected, then delete their folders. 

Note: If you are sure something is part of the infection – delete it, even if the scanner doesn’t flag it. No anti-virus program can detect all infections.


Hold the Start Key and R –  copy + paste the following and click OK:

notepad %windir%/system32/Drivers/etc/hosts

A new file will open. If you are hacked, there will be a bunch of other IPs connected to you at the bottom. Look at the image below:

hosts_opt (1)

If there are suspicious IPs below “Localhost” – write to us in the comments.

Type msconfig in the search field and hit enter. A window will pop-up:


Go in Startup —> Uncheck entries that have “Unknown” as Manufacturer.

  • Please note that ransomware may even include a fake Manufacturer name to its process. Make sure you check out every process here is legitimate.


To remove parasite, you may have to meddle with system files and registries. Making a mistake and deleting the wrong thing may damage your system.
Avoid this by using SpyHunter - a professional Parasite removal tool.

Keep in mind, SpyHunter’s malware & virus scanner is free. To remove the infection, you'll need to purchase its full version. More information about SpyHunter and steps to uninstall.

Type Regedit in the windows search field and press EnterOnce inside, press CTRL and F together and type the virus’s Name. 

Search for the ransomware  in your registries and delete the entries. Be extremely careful –  you can damage your system if you delete entries not related to the ransomware.

Type each of the following in the Windows Search Field:

  1. %AppData%
  2. %LocalAppData%
  3. %ProgramData%
  4. %WinDir%
  5. %Temp%

Delete everything in Temp. The rest just check out for anything recently added. Remember to leave us a comment if you run into any trouble!


How to Decrypt .karl files

We have a comprehensive (and daily updated) guide on how to decrypt your files. Check it out here.

If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you can always ask us in the comments for help!

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