.kropun Files Virus - How to Remove It

.kropun Files Virus – How to Remove It

This article has been created to help explain what is the .kropun file extension variant of Stop ransomware and how you can remove it plus try to get your files back.

STOP ransomware keeps surprising users with more and more versions. One such version is the one, using the .kropun file suffix. The .kropun STOP virus aims to make the files on your computer not readable and you cannot open them. The malware is a variant of the STOP Ransomware family of viruses – a nasty malicious program that does this because the people behind it want you to pay ransom in the form of BitCoins, which is highly inadvisable. If your computer has been infected by the .kropun version of STOP ransomware, we recommend that you read this article thoroughly.

Threat Summary

Name.kropun STOP Virus
TypeRansomware, Cryptovirus
Short DescriptionCreated to encrypt valuable files stored on compromised computers and afterward urges victims to pay ransom.
SymptomsFiles are encrypted and renamed with the .kropun file extension. A ransom note file called _readme.txt is dropped and loaded on screen to extort ransom payment.
Distribution MethodSpam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by .kropun STOP Virus


Malware Removal Tool

User ExperienceJoin Our Forum to Discuss .kropun STOP Virus.
Data Recovery ToolWindows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

.kropun Stop Ransomware – Distribution

The .kropun variant of STOP ransomware may infect a computer via more than one ways. For starters, the virus may comrpomise machines via a malicious web link, whose primary purpose is to inject an automated JavaScript code, that may download the payload of this virus onto the compromised computers by it.

The .kropun ransomware may use other means of distribution as well, such as spread its infection file as an e-mail attachment over the mail. Such e-mails aim to convince users to download and run the attachment and they often portray it as a “must see” document that is very important. Often, the subjects of the e-mail are similar to the examples below:

  • “Your payment invoice.”
  • “Your order has been revoked.”
  • “Your bank receipt.”
  • “Your PayPal invoice.”
  • “Problem with your visa/mastercard.”

The attachment themselves may either be a .js or other type of file in an archive or they may be a .docx or .pdf file with embedded malcious macros. The latter two trigger infection when you enable their content.

Another mean of distribution used by the .kropun files virus is to come to your computer as a result of being directly uploaded on a suspicious site, where they might seem as If they are exactly what you are trying to download, like:

  • Crack for a program.
  • Keygen.
  • Patch.
  • Installer.
  • Portable program.
  • License activator for Windows or Microsoft Office.

.kropun STOP Ransomware – Activity

Once an infection with the .kropun version of STOP ransomware has occurred, the virus may drop its ransom note file on several Windows directories on the infected computer:

  • %AppData%
  • %Local%
  • %Temp%
  • %Roaming%
  • %ProgramData%
  • %LocalLow%

Shortly after this has been done, the ransomware virus may start to create multiple different types of files and those include its ransom note, that has the following message to victims:

———————————————- ALL YOUR FILES ARE ENCRYPTED ———————————————–

Don’t worry, you can return all your files!
All your files documents, photos, databases 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 do we give to you?
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
Don’t try to use third-party decrypt tools because it will destroy your files.
Discount 50% available if you contact us first 72 hours.
To get this software you need write on our e-mail:
Reserve e-mail address to contact us:
Your personal ID:
[redacted 43 alphanumeric chars]

In addition to the ransom note, the .kropun Virus may also edit the following reigstry sub-keys by adding value strings in them which open files automatically when you start Windows:

→ HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

Furthermore, the .kropun ransomware may also perform other actions, like delete the shadow copy files from the victim PC as well as disable Windows Recovery. These actions are done by the .kropun ransomware so that you cannot recover your files with the help of Windows backup services. To do them, the .kropun Ransomware may execute a script that enters commands similar to the ones below as an administrator in Windows Command Prompt:

→ sc stop VVS
sc stop wscsvc
sc stop WinDefend
sc stop wuauserv
sc stop BITS
sc stop ERSvc
sc stop WerSvc
cmd.exe /C bcdedit /set {default} recoveryenabled No
cmd.exe /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
C:\Windows\System32\cmd.exe” /C vssadmin.exe Delete Shadows /All /Quiet

From the latest information which we have received, the virus has been listed as a RaaS (ransomware-as-a-service), which means that crooks pay the official ransomware developers to spread the virus in their own variant and hence infect computer and what the “investor” gets is the profit from the ransom, while the crooks take percentage of it for developing and managing the infection and ransom services.

.kropun Ransomware –
Encryption Process

To encrypt files, .kropun Ransomware may use an AES-256 encryption cipher. This algorithm is known as Advanced EncryptionStandard and is usually used by the government agenices to encode sensitive information. The cipher generates assymetric key which corresponds to a master key that is only known by the crooks. To encrypt files, the .kropun ransomware may first check your computer for the file types that should be encrypted. These files are usually documents, videos, images, videos, archives, music files and other often used files that may be important for you. The ransomware scans them based on their file extensions, for example it may have a pre-configured list of extensions to scan for, like the one below:


When the .kropun ransomware manages to encrypt the files on the computers it has already infected, the virus may immediately set its .kropun extension to them and the files start to appear like the following:

Remove .kropun Files Virus and Attempt to Restore Data

Before actually removing the .kropun variant of STOP ransomware, we strongly recommend that you backup your files. This can happen safely via creating a Windows image or via copying your hard drive data to another drive.

To remove .kropun files ransomware, we strongly recommend that you follow the removal instructions posted underneath. They are made to help you delete the virus files of .kropun ransomware either manually or automatically. If the first two manual steps do not seem to work or you feel unconfident in removing this ransomware manually, then we reccomend that you remove it automatically by downloading an advanced anti-malware software to perform a scan and detect and eliminate all .kropun virus files for you.

If you want to try and get your data back, we strongly suggest that you see the alternative steps in the “Try to restore” paragraph underneath. They may not be 100% effective, but with their help, you might just be able to get at least some of your data back


Ventsislav Krastev

Ventsislav has been covering the latest malware, software and newest tech developments at SensorsTechForum for 3 years now. He started out as a network administrator. Having graduated Marketing as well, Ventsislav also has passion for discovery of new shifts and innovations in cybersecurity that become game changers. After studying Value Chain Management and then Network Administration, he found his passion within cybersecrurity and is a strong believer in basic education of every user towards online safety.

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