THREAT REMOVAL

.CORE Files Virus – How to Remove It and Restore Data

.CORE Files Virus Matrix ransomwareHow to Remove It and Restore Data sensorstechforum guide

This is an article that provides specific details on .CORE files virus infection as well as a step-by-step removal followed by alternative data recovery approaches.

As identified by security researchers the so-called .CORE files virus is a strain of Matrix ransomware. Once started on a target host it plagues various system settings in order to encrypt valuable files stored on it. The encryption is realized with the help of highly sophisticated encryption technique that combines AES-128 + RSA-2048 cipher algorithms. Upon encryption, all corrupted files remain inaccessible until an efficient recovery solution is employed. The long string of specific extensions [BatHelp@protonmail.com].{random letters and numbers}-{again random letters and numbers}.CORE appears after the original names of encrypted files. According to hackers victims should pay a ransom within 7 days in order to decrypt their .CORE files.

Threat Summary

Name .CORE files virus
Type Ransomware, Cryptovirus
Short Description A data locker ransomware that utilizes combination of AES-128 + RSA-2048 cipher algorithms to encrypt valuable files stored on an infected computer. A ransom for specific decryption solution is demanded.
Symptoms Important files are locked and renamed with a long string of extensions that is enging with .CORE extension. Files remain unusable until an efficient recovery solution is used to revert back their original code.
Distribution Method Spam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by malware

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Malware Removal Tool

User Experience Join Our Forum to Discuss .CORE files virus.
Data Recovery Tool Windows 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.

.CORE Files Virus – Distribution

The infection code of .CORE files virus is most likely being spread with the help of malspam e-mail campaigns. E-mails used for malicious purposes usually contain one or more of the following components:

  • A link that lands on compromised web page set to download and execute the infection file directly on the PC.
  • A malicious file attachment masked as a legitimate document and uploaded in a .rar or .zip archive. Such a file could be set to evade detection and this way tricks you into allowing the ransomware to start on your PC.

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

.CORE Files Virus – Overview

As identified by security researchers the so-called .CORE files virus is a strain of Matrix ransomware which was initially detected in December 2016. As a typical data locker ransomware .CORE primarily aims to corrupt predefined types of files stored on infected PCs. This way hackers become able to blackmail victims into paying a ransom which is not specified at this point.

Before encryption, however, the threat needs to establish all malicious files necessary for the smooth infection process. Once all malicious files are dropped or directly created on the system the ransomware initiates a sequence of system modifications. Mostly the changes are likely to affect some particular registry keys like Run and RunOnce. This could be explained by the fact that these keys manage the automatic execution of all files and objects that are essential for the normal system load each time it is started.

By manipulating their functionalities .CORE files virus files start automatically on each system start which in turn results in the corruption of all newly created files before the last system shut down.

Аt the end of the infection process the ransomware drops a ransom message crafted by hackers who aim to inform victims about the presence of their threat on the system and its devastating impact over valuable data. The message further instructs how the ransom could be paid. The ransom message associated with .CORE ransomware is contained in a rich text format file called #CORE_README#.rtf. Below you could see an image of an opened #CORE_README#.rtf file as well as all the text depicted on it:

#CORE_README#.rtf .CORE ransomare virus ransom message

HOW TO RECOVER YOUR FILES INSTRUCTION
ATTENTION!!!
We are realy sorry to inform you that ALL YOUR FILES ENCRYPTED by our automatic software. It became possible because of bad server security.
ATTENTION!!!
Please don’t worry, we can help you to RESTORE your server to original state and decrypt all your quickly and safely
INFORMATION!!!
Files are not broken!!!
Files were encrypted with AES-128+RSA-2048 crypto algorithms.
There is no way to decrypt your files without unique decryption key and special software. Your unique decryption key is secretly stored on our server. For our safety, all information about your server and your decryption key will be automatically DELETED AFTER 7 DAYS! You will irrevocably lose all your data!
*Please note that all the attempts to recover your files by yourself or using third-party tools will resul only in irrevocable loss of your data!
*Please note that you can recover files only with your unique decryption key, which started on our side. If you will use the help of third parties, you will only add a middleman.
HOW TO RECOVER FILES???
Please write us to the e-mail (write on English or use professional translator).
You have to send your message on each of our 3 emails:
BatHelp@protonmail.com
BatHelp@tutona.com
BatHelp@india.com

In subject like write your personal ID:
*****************
We recommend you to attach 3 encrypted files to your message. We will demonstrate that we can recover your files.
*Please note that files must not contain any valuable information and their total size must be less than 5Mb.
OUR ADVICE!!!
Please be sure that we will find common language. We will restore all the data and give you recommendations how to configure the protection of your server.
We will definitely reach an agreement ;) !!!
ALTERNATIVE COMMUNICATION
If you did not receive the answer from the aforecited emails for more then 24 hours please send us Bitmessages from a web browser through the webpage https//bitmsg.me. Below is a tutorial on how to send bitmessage via web browser:
1. Open in your browser the link https//bitmsg.me/users/sign_up and make the registration by entering name email and password.
2. You must confirm the registration, return to your email and follow the instructions that were sent to you.
3. Return to site ad click “Login” label or use link ****, enter your email and password and click the “Sign in” button.
4. Click the “Create Random address” button.
5. Click the “New message” button.
6. Sending message:
TO: Enter address: BM-2Cxrwrw5jv5hxbhgu2HUSJrtPf92iKshhm
Subject: Enter your ID: 0D1C44DB09247B05
Message: Describe what you think necessary.
Click the “Send message” button.

.CORE Files Virus – Data Encryption Process

This new strain of Martix ransomware is stated to use a combination of two cipher algorithms – AES-128 + RSA-2048 to corrupt target files. So once the encryption phase occurs the ransomware triggers its built-in sophisticated ciphering module to modify parts of the original files’ code and this way restricts the access to the information they store. It is likely that all of the following types of files will be corrupted by .CORE crypto virus after it gains access to a computer system:

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

Following encryption corrupted files remain inaccessible until an efficient data recovery solution is put into use. They could be all recognized by the distinctive string of extensions appended to their original names:

  • [BatHelp@protonmail.com].{random letters and numbers}-{again random letters and numbers}.CORE

The unique decryption key is generated during the encryption process but soon after it transferred to hackers’ controlled server so that you cannot access it without contacting them.

Remove .CORE Files Virus and Restore Data

Below you could find how to remove .CORE files virus step by step. To remove the ransomware manually you need to have a bit of technical experience and ability to recognize traits of malware files. Beware that ransomware is a threat with highly complex code that plagues not only your files but your whole system. So as recommended by security researchers you need to utilize an advanced anti-malware tool for its complete removal. Such a tool will keep your system protected against devastating threats like the discussed ransomware and other kinds of malware that endanger your online security.

After you remove the ransomware make sure to check the “Restore Files” step listed in the guide below. But before you take any further actions, don’t forget to back up all encrypted files to an external drive in order to prevent their irreversible loss.

Gergana Ivanova

Gergana Ivanova

Gergana has a bachelor's degree in Marketing. She has been with the STF team for five years, researching malware, reporting on the latest computer infections, and following digital marketing trends.

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Attention! SensorsTechForum strongly recommends that all malware victims should look for assistance only by reputable sources. Many guides out there claim to offer free recovery and decryption for files encrypted by ransomware viruses. Be advised that some of them may only be after your money.

As a site that has been dedicated to providing free removal instructions for ransomware and malware since 2014, SensorsTechForum’s recommendation is to only pay attention to trustworthy sources.

How to recognize trustworthy sources:

  • Always check "About Us" web page.
  • Profile of the content creator.
  • Make sure that real people are behind the site and not fake names and profiles.
  • Verify Facebook, LinkedIn and Twitter personal profiles.


OFFER

REMOVE IT NOW (PC)
with Anti-Malware
We recommend you to download SpyHunter and run free scan to remove all virus files on your PC. This saves you hours of time and effort compared to doing the removal yourself.
SpyHunter 5 free remover allows you, subject to a 48-hour waiting period, one remediation and removal for results found. Read EULA and Privacy Policy


Windows Mac OS X

How to Remove .CORE files virus from Windows.


Step 1: Boot Your PC In Safe Mode to isolate and remove .CORE files virus

OFFER

Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your PC with SpyHunter

Keep in mind, that SpyHunter’s scanner is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware removal tool to remove the malware threats. Read our SpyHunter 5 review. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria

1. Hold Windows key() + R


2. The "Run" Window will appear. In it, type "msconfig" and click OK.


3. Go to the "Boot" tab. There select "Safe Boot" and then click "Apply" and "OK".
Tip: Make sure to reverse those changes by unticking Safe Boot after that, because your system will always boot in Safe Boot from now on.


4. When prompted, click on "Restart" to go into Safe Mode.


5. You can recognise Safe Mode by the words written on the corners of your screen.


Step 2: Uninstall .CORE files virus and related software from Windows

Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it. To do that:


1. Hold the Windows Logo Button and "R" on your keyboard. A Pop-up window will appear.


2. In the field type in "appwiz.cpl" and press ENTER.


3. This will open a window with all the programs installed on the PC. Select the program that you want to remove, and press "Uninstall"
Follow the instructions above and you will successfully uninstall most programs.


Step 3: Clean any registries, created by .CORE files virus on your computer.

The usually targeted registries of Windows machines are the following:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

You can access them by opening the Windows registry editor and deleting any values, created by .CORE files virus there. This can happen by following the steps underneath:

1. Open the Run Window again, type "regedit" and click OK.


2. When you open it, you can freely navigate to the Run and RunOnce keys, whose locations are shown above.


3. You can remove the value of the virus by right-clicking on it and removing it.
Tip: To find a virus-created value, you can right-click on it and click "Modify" to see which file it is set to run. If this is the virus file location, remove the value.

IMPORTANT!
Before starting "Step 4", please boot back into Normal mode, in case you are currently in Safe Mode.
This will enable you to install and use SpyHunter 5 successfully.

Step 4: Scan for .CORE files virus with SpyHunter Anti-Malware Tool

1. Click on the "Download" button to proceed to SpyHunter's download page.


It is recommended to run a scan before purchasing the full version of the software to make sure that the current version of the malware can be detected by SpyHunter. Click on the corresponding links to check SpyHunter's EULA, Privacy Policy and Threat Assessment Criteria.


2. After you have installed SpyHunter, wait for it to update automatically.

SpyHunter5-update-2018


3. After the update process has finished, click on the 'Malware/PC Scan' tab. A new window will appear. Click on 'Start Scan'.

SpyHunter5-Free-Scan-2018


4. After SpyHunter has finished scanning your PC for any files of the associated threat and found them, you can try to get them removed automatically and permanently by clicking on the 'Next' button.

SpyHunter-5-Free-Scan-Next-2018

If any threats have been removed, it is highly recommended to restart your PC.

Step 5 (Optional): Try to Restore Files Encrypted by .CORE files virus.

Ransomware infections and .CORE files virus aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.


Windows Mac OS X

Get rid of .CORE files virus from Mac OS X.


Step 1: Uninstall .CORE files virus and remove related files and objects

OFFER
Manual Removal Usually Takes Time and You Risk Damaging Your Files If Not Careful!
We Recommend To Scan Your Mac with SpyHunter for Mac
Keep in mind, that SpyHunter for Mac needs to purchased to remove the malware threats. Click on the corresponding links to check SpyHunter’s EULA and Privacy Policy


1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:


2. Find Activity Monitor and double-click it:


3. In the Activity Monitor look for any suspicious processes, belonging or related to .CORE files virus:

Tip: To quit a process completely, choose the “Force Quit” option.


4. Click on the "Go" button again, but this time select Applications. Another way is with the ⇧+⌘+A buttons.


5. In the Applications menu, look for any suspicious app or an app with a name, similar or identical to .CORE files virus. If you find it, right-click on the app and select “Move to Trash”.


6: Select Accounts, after which click on the Login Items preference. Your Mac will then show you a list of items that start automatically when you log in. Look for any suspicious apps identical or similar to .CORE files virus. Check the app you want to stop from running automatically and then select on the Minus (“-“) icon to hide it.


7: Remove any left-over files that might be related to this threat manually by following the sub-steps below:

  • Go to Finder.
  • In the search bar type the name of the app that you want to remove.
  • Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
  • If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.

In case you cannot remove .CORE files virus via Step 1 above:

In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:

Disclaimer! If you are about to tamper with Library files on Mac, be sure to know the name of the virus file, because if you delete the wrong file, it may cause irreversible damage to your MacOS. Continue on your own responsibility!

1: Click on "Go" and Then "Go to Folder" as shown underneath:

2: Type in "/Library/LauchAgents/" and click Ok:

3: Delete all of the virus files that have similar or the same name as .CORE files virus. If you believe there is no such file, do not delete anything.

You can repeat the same procedure with the following other Library directories:

→ ~/Library/LaunchAgents
/Library/LaunchDaemons

Tip: ~ is there on purpose, because it leads to more LaunchAgents.


Click the button below below to download SpyHunter for Mac and scan for .CORE files virus:


Download

SpyHunter for Mac



Step 3 (Optional): Try to Restore Files Encrypted by .CORE files virus.

Ransomware infections and .CORE files virus aim to encrypt your files using an encryption algorithm which may be very difficult to decrypt. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files. Bear in mind that this method may not be 100% effective but may also help you a little or a lot in different situations.

1. Download the reccomended Data Recovery software by clicking on the link underneath:

Simply click on the link and on the website menus on top, choose Data Recovery - Data Recovery Wizard for Windows or Mac (depending on your OS), and then download and run the tool.


.CORE files virus FAQ

What is .CORE files virus ransomware and how does it work?

.CORE files virus is a ransomware infection - the malicious software that enters your computer silently and blocks either access to the computer itself or encrypt your files.

Many ransomware viruses use sophisticated encryption algorithm how to make your files inaccessible. The goal of ransomware infections is to demand that you pay a ransom payment to get access to your files back.

How does .CORE files virus ransomware infect my computer?

Via several ways..CORE files virus Ransomware infects computers by being sent via phishing e-mails, containing virus attachment.

This attachment is usually masked as an important document, like an invoice, bank document or even a plane ticket and it looks very convincing to users.

After you download and execute this attachment, a drive-by download occurs and your computer is infected with the ransomware virus.

Another way, you may become a victim of .CORE files virus is if you download a fake installer, crack or patch from a low reputation website or if you click on a virus link. Many users report getting a ransomware infection by downloading torrents.

How to open ..CORE files virus files?

You can't. At this point the ..CORE files virus files are encrypted. You can only open them once they are decrypted.

Decryptor did not decrypt my data. What now?

Do not panic and backup the files. If a decryptor did not decrypt your ..CORE files virus files successfully, then do not despair, because this virus is still new.

One way to restore files, encrypted by .CORE files virus ransomware is to use a decryptor for it. But since it's a new virus, advised that the decryption keys for it may not be out yet and available to the public. We will update this article and keep you posted as soon as this decryptor is released.

How Do I restore "..CORE files virus" files (Other Methods)?

Yes, sometimes files can be restored. We have suggested several file recovery methods that could work if you want to restore ..CORE files virus files.

These methods are in no way 100% guarantee that you will be able to get your files back. But if you have a backup, your chances of success are much greater.

How do I get rid of .CORE files virus ransomware virus?

The safest way and the most efficient one for the removal of this ransomware infection is the use a professional anti malware software. It will scan for and locate .CORE files virus ransomware and then remove it without causing any additional harm to your important ..CORE files virus files.

Also, keep in mind that viruses like .CORE files virus ransomware also install Trojans and keyloggers that can steal your passwords and accounts. Scanning your computer with an anti-malware software will make sure that all of these virus components are removed and your computer is protected in the future.

What to Do If nothing works?

There is still a lot you can do. If none of the above methods seem to work for you, then try these methods:

  • Try to find a safe computer from where you can can login on your own line accounts like One Drive, iDrive, Google Drive and so on.
  • Try to contact your friends, relatives and other people so that they can check if they have some of your important photos or documents just in case you sent them.
  • Also, check if some of the files that were encrypted it can be re-downloaded from the web.
  • Another clever way to get back some of your files is to find another old computer, a flash drive or even a CD or a DVD where you may have saved your older documents. You might be surprised what will turn up.
  • You can also go to your email account to check if you can send any attachments to other people. Usually what is sent the email is saved on your account and you can re-download it. But most importantly, make sure that this is done from a safe computer and make sure to remove the virus first.

More tips you can find on our forums, where you can also asks any questions about your ransomware problem.

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