.KOK08 Files Virus - Remove It and Restore Data

.KOK08 Files Virus – Remove It and Restore Data

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Our article provides an overview of .KOK08 files virus as well as a detailed guide that may be helpful in attempting to remove this nasty virus.

The so-called .KOK08 files virus invades computer systems with the purpose to corrupt system settings and so it can then encrypts valuable files with the help of two strong cipher algorithms. These consequences, in turn, enable hackers to blackmail victims into paying a ransom for a unique decryption key. The extortion happens with the help of a ransom note file called #KOK08_README#.rtf.

Threat Summary

TypeRansomware, Cryptovirus
Short DescriptionA data locker ransomware that encodes target files stored on the infected computer and then demands a ransom for a decryption key posessed by hackers.
SymptomsThe access to valuable files is restricted. They are all renamed with a string of extensions that ends with the .KOK08 extension. Hackers demand a ransom payment.
Distribution MethodSpam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by KOK08


Malware Removal Tool

User ExperienceJoin Our Forum to Discuss KOK08.
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.

.KOK08 Files Virus – Distribution

How the infection code of .KOK08 files virus could be spread is via malspam e-mail campaigns. There are some common traits of e-mails that are used for malicious purposes and they are:

  • A presented link that lands on web page compromised by hackers. Such page could be set to download and execute the ransomware payload directly on the computer of each user who got tricked into visiting it.
  • A file attachment of familiar file type such as document (.doc, .PDF, .docx, .xlsx, etc.) archive (.rar, .zip, .7z, etc.) or other. Corrupted files could be masked as legitimate ones in order to trick you into running them on your device and this way unintentionally enable the ransomware to infect your data.

Along with this spread technique, other methods like malicious exploit kits, fake notifications for software updates and infected third-party app installers may be also used to scam you to allow the infection to plague your computer system.

.KOK08 Files Virus – Overview

The so-called .KOK08 files virus has been identified as a strain of Matrix ransomware family. An infection with .KOK08 files virus begins with the execution of its payload on a target system. The moment this event occurs, the ransomware becomes able to initiate a sequence of malicious actions that support its attack.

Once the ransomware establishes all needed malicious files on the system which it does by creating or dropping them from its command and control server, it starts to consequently execute them until it reaches the data encryption stage.

The purpose of its associated files is the contamination of major system components and their settings. In addition, some of them could be set to manipulate legitimate system processes and prevent active security measures from detecting the ransomware presence.

In case of infection with .KOK08 files virus it is likely that specific registry sub-keys will also be plagued by malicious entries. These keys could be Run and RunOnce as they could automatically execute ransomware files on each system start.

Following encryption, the ransomware drops the file #KOK08_README#.rtf on the device to inform victims about its presence and blackmail them into paying certain ransom to hackers. At this point, it is only known that the contact email provided by cybercriminals is KOK08@protonmail.com. As of the ransom they demand it should be in Bitcoin.

.KOK08 Files Virus – Encryption Process

Being a strain of Martix, .KOK08 ransomware could be set to use a combination of two or more sophisticated cipher algorithms to corrupt target files. And like its predecessors .KOK08 ransomware could scan predefined system drives for all of the below mentioned types of files in order to encode parts of their original code:

  • Audio files
  • Video files
  • Document files
  • Image files
  • Backup files
  • Banking credentials, etc

After this process, data stored by corrupted files is inaccessible. Your access to restricted files is only possible after the recovery of encrypted files. How you could recognize corrupted files is by the distinctive sequence of extensions appended to their original names.

As identified after a thorough analysis conducted by the security researcher Michael Gillespie, this version of Matrix ransomware uses three extensions to mark corrupted data. The sequence begins with the contact email provided by hackers .[KOK08@protonmail.com] and ends with the specific .KOK08. Actually, the threat is named after one of its associated malicious extensions.

As of the unique decryption key, it is transferred to hackers controlled server immediately after the encryption process. This enables them to blackmail you into paying a demanded ransom. However, you should avoid doing this as such an action does not guarantee the recovery of your encrypted files.

Remove .KOK08 Files Virus and Restore Data

The ransomware associated with .KOK08 extension is a threat with highly complex code that plagues not only your files but your whole system. So you should properly clean and secure your infected system before you could use it again. Below you could find a step-by-step removal guide that may be helpful in attempting to remove this ransomware. Choose the manual removal approach if you have previous experience with malware files. If you don’t feel comfortable with the manual steps select the automatic section from the guide. Steps there enable you to check the infected system for ransomware files and remove them with a few mouse clicks.

In order to keep your system safe from ransomware and other types of malware in future, you should consider the installation of a reliable anti-malware program. As an additional security layer that could prevent the occurrence of ransomware attacks you could install an

anti-ransomware tool.

If you want to understand how to potentially fix encrypted files with the help of alternative data recovery approaches, make sure to read carefully all details mentioned in the step “Restore files”. We remind you that before you begin with the data recovery process, you should back up all encrypted files to an external drive as this will help you to prevent their irreversible loss.

Gergana Ivanova

Gergana Ivanova

Gergana has completed a bachelor degree in Marketing from the University of National and World Economy. She has been with the STF team for four years, researching malware and reporting on the latest infections.

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