Klope Ransomware

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

Klope ransomware removal instructions

What is Klope?

Discovered by Michael Gillespie, Klope is yet another variant of high-risk ransomware called Djvu. This malware is designed to stealthily infiltrate computers and encrypt stored files. In doing so, Klope appends filenames with the ".klope" extension (for instance, "sample.jpg" is renamed to "sample.jpg.klope"). Encrypted data immediately becomes unusable. In addition to file encryption, Klope generates a text file called "_readme.txt" and places a copy in every existing folder. The new file contains a ransom-demand message.

The message within Klope's text file is identical to those delivered by other variants of Djvu. It is stated that data is encrypted and can only be restored using a decryption tool together with a unique key. Unfortunately, this information is accurate. It is currently unknown whether Klope uses symmetric or asymmetric cryptography. In any case, a unique decryption key is generated individually for each victim. All keys are stored on a remote server controlled by cyber criminals. Victims are forced to pay a ransom for decryption. To receive a decryption key and tool, each victim must pay a ransom of $980. Victims receive all payment instructions after contacting cyber criminals via one of the email addresses provided. It is also stated that victims who make within 72 hours of encryption will receive a 50% discount (thus, the cost of decryption drops to $490). Victims are permitted to attach one selected file, which is restored and returned to the victim as a 'guarantee' that decryption is possible. Regardless of the cost, do not pay. Be aware that cyber criminals often ignore victims, once payments are submitted. Therefore, victims often submit payments and receive nothing in return. Ignore all requests to submit payments or contact these people. Unfortunately, there are no tools capable of cracking Klope encryption and restoring data free of charge. The only solution is to restore everything from a backup (if one has been created).

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

Klope decrypt instructions

There are dozens of ransomware-type viruses that share similarities with Klope. Jamper, GILETTE, and a800 are just some examples from many. Although the developers are different, ransomware-type infections have identical behavior: they encrypt data and make ransom demands. Unfortunately, ransomware infections usually employ cryptographies such as RSA, AES, and similar, that generate unique decryption keys. Therefore, it is virtually impossible to decrypt data manually, without the involvement of developers (contacting these people is not recommended). The only possible scenarios are ransomware not being fully developed or having certain bugs/flaws (e.g., the key is hard-coded, stored locally, or similar). Therefore, ransomware presents a strong case for maintaining regular backups, however, store them on a remote server or unplugged storage device, since locally stored backups are encrypted with regular data.

How did ransomware infect my computer?

It is currently unknown exactly how developers proliferate Klope, however, in most cases, ransomware infections are proliferated using spam email campaigns, third party software download sources, trojans, fake software updaters, and 'cracks'. Spam campaigns are used to proliferate malicious attachments that, once opened, inject malware into the system. Unofficial download sources (free file hosting sites, freeware download websites, peer-to-peer [P2P] networks, etc.) are used to present malicious executables as legitimate software. Trojans are essentially infectious applications that stealthily infiltrate computers and install additional malware. Fake updaters proliferate malware by exploiting outdated software bugs/flaws or simply downloading and installing malware rather than updates. Finally, software cracks activate paid software free of charge (illegally), however, since they are often used to proliferate malware, many users end up installing malware rather than activating any software. In most cases, the main reasons for computer infections are poor knowledge of these threats and careless behavior.

Threat Summary:
Name Klope virus
Threat Type Ransomware, Crypto Virus, Files locker.
Symptoms Unable to open files stored on the computer, previously functional files now have a different extension, for example my.docx.locked. A ransom demand message is displayed on the desktop. Cyber criminals demand a ransom payment (usually in bitcoins) to unlock 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 Klope virus our malware researchers recommend scanning your computer with Spyhunter.
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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?

The main reasons for computer infections are poor knowledge of these threats and careless behavior. The key to computer safety is caution and, therefore, pay close attention when browsing the internet and downloading, installing, and updating software. Think twice before opening email attachments. If the file/link seems irrelevant, or the sender is suspicious, do not open anything and delete the email immediately. Download apps from official sources only, using direct download links. Third party downloaders/installers often include rogue applications, and thus these tools should never be used. Keep installed applications and operating systems up-to-date. Use implemented functions or tools provided by the official developer only. You should never use software cracks, since software piracy is considered a cyber crime and the risk of infection is also extremely high. Finally, have a reputable anti-virus/anti-spyware suite installed and running. These tools will help you to protect the system, since they can detect and eliminate malware before the system is harmed. The key to computer safety is caution. If your computer is already infected with Klope, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in Klope ransomware text file ("_readme.txt"):

Don't worry my friend, you can return all your files!
All your files like photos, databases, documents and other important are encrypted with
strongest encryption and unique key.
The only method of recovering files is to purchase decrypt tool and unique key for you.
This software will decrypt all your encrypted files.
What guarantees you have?
You can send one of your encrypted file from your PC and we decrypt it for free.
But we can decrypt only 1 file for free. File must not contain valuable information.
You can get and look video overview decrypt tool:
Price of private key and decrypt software is $980.
Discount 50% available if you contact us first 72 hours, that's price for you is $490.
Please note that you'll never restore your data without payment.
Check your e-mail "Spam" folder if you don't get answer more than 6 hours.
To get this software you need write on our e-mail:
Reserve e-mail address to contact us:
Your personal ID:

Screenshot of files encrypted by Klope (".klope" extension):

Files encrypted by Klope

As with most ransomware from the Djvu family, Klope also displays a fake Windows update pop-up during encryption:

Djvu ransomware family fake update

IMPORTANT NOTE! - As well as encrypting data, ransomware-type infections from the Djvu malware family also install a trojan-type virus called AZORult, which is designed to steal various account credentials. Moreover, this malware family is designed to add a number of entries to the Windows hosts file. The entries contain URLs of various websites, most of which are related to malware removal. This is done to prevent users from accessing malware security websites and seeking help. Our website (PCrisk.com) is also on the list. Removing these entries, however, is simple - you can find detailed instructions in this article (note that, although the steps are shown in the Windows 10 environment, the process is virtually identical on all versions of the Microsoft Windows operating system).

Screenshot of websites added to Windows hosts file:

Tro Ransomware adding websites to Windows Hosts file

Klope ransomware removal:

Instant automatic removal of Klope 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 Klope 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 Klope 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 Klope 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 Klope 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 Klope 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 Klope, 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 Klope 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 as well as 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 Klope 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 pcrisk.com 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 virus and spyware activity level today:

Medium threat activity

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

QR Code
Klope 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 Klope virus on your mobile device.
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Platform: Windows

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