NetWalker Cryptovirus (Mailto) - Ransomware Removal Guide
THREAT REMOVAL

NetWalker Cryptovirus (Mailto) – Ransomware Removal Guide

NetWalker ransomware is a variant of the Mailto Ransomware family as malware researchers have discovered. NetWalker ransomware which locks files on a computer and demands money to be paid as a ransom for unlocking them.

stf-NetWalker-ransomware-gui

NetWalker Ransomware (.Mailto Cryptovirus)

NetWalker ransomware is believed to be a variant of the Mailto Ransomware family. The .mailto file extension along with an email address is attached as the extension to all of your files, making them inaccessible. All encrypted files will receive the new extension as a secondary one. The NetWalker ransomware drops a ransom note, which gives instructions to victims on how they can allegedly restore their data by paying a ransom fee.

NetWalker Ransomware Virus

NetWalker Ransomware will encrypt all types of files such as audio, video, pictures, backups, banking data and other personal user files found on a compromised computer system.

Threat Summary

NameNetWalker
File Extension.mailto
Type Ransomware, Cryptovirus
Short DescriptionThe ransomware encrypts files on your computer system and demands a ransom to be paid to allegedly recover them.
SymptomsThe NetWalker ransomware will encrypt your files by appending the .mailto extension to them, along with a unique identification number placing the new .mailto extension as a secondary.
Distribution MethodSpam Emails, Email Attachments
Detection Tool See If Your System Has Been Affected by NetWalker

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User ExperienceJoin Our Forum to Discuss NetWalker.

Netwalker Cryptovirus (Mailto) May 2020 Update

In May 2020 new information became available about the way the Netwalker ransomware infects computers. One of the newer attacks used a new technique called reflective loading which is used for DLL Injection, one of the advanced ways through which viruses are deployed. One of the key differences between it and ordinary ones is that the loading happens from memory. No files are saved on the disk of the devices which guards against discovery by some anti-virus programs.

The Netwalker virus infection is made in a several stage sequence – a PowerShell script is initiated which will download the virus and run it on the system. One of the notable characteristics is that the initial loader code is encrypted, obfuscated and encoded in several layers.

The ransomware will also terminate processes, one of the collected samples shows that the following are affected:

backup, sql, Acronis Agent, ARSM, Server Administrator, Shadow Protect Svc, wbengine, excel.exe, ntrtscan.exe, powerpt.exe, winword.exe and wra.exe

March 2020 Netwalker Cryptovirus Attacks Against Health Organizations

A new attack campaign carrying the NetWalker cryptovirus is currently targeting healthcare organizations. An unknown hacking group is creating email messages which are designed to infiltrate organizations and companies.

This means that the criminals have carefully selected targets so that they match a certain profile. The intention is to deliver the virus through common mechanisms. The first and primary one is to attach the virus file or a malware-infected file directly to the emails. The alternative is to link the ransomware via text links, multimedia files and etc.

NetWalker Ransomware – How Did It Infect My PC and What Happened?

NetWalker ransomware might spread its infection via a payload dropper, which initiates the malicious script for this ransomware. The virus might also distribute its payload file on social media and file-sharing services. Freeware which is found on the Web can be presented as helpful also be hiding the malicious script for the cryptovirus.

The ransomware encrypts your files and shows ransomware instructions inside a ransom note that is called ID-Readme.txt as showcased in the picture below:

stf-NetWalker-ransomware-note

The note states the following:

Hi!
Your files are encrypted.
All encrypted files for this computer has extension: .1401

If for some reason you read this text before the encryption ended,
this can be understood by the fact that the computer slows down,
and your heart rate has increased due to the ability to turn it off,
then we recommend that you move away from the computer and accept that you have been compromised,
rebooting/shutdown will cause you to lose files without the possibility of recovery and even god will not be able to help you,
it could be files on the network belonging to other users, sure you want to take that responsibility?

Our encryption algorithms are very strong and your files are very well protected, you can’t hope to recover them without our help.
The only way to get your files back is to cooperate with us and get the decrypter program.
Do not try to recover your files without a decrypt program, you may damage them and then they will be impossible to recover.
We advise you to contact us as soon as possible, otherwise there is a possibility that your files will never be returned.
For us this is just business and to prove to you our seriousness, we will decrypt you some files for free,
but we will not wait for your letter for a long time, mail can be abused, we are moving on, hurry up with the decision.
Сontact us:
1.kazkavkovkiz@cock.li
2.Hariliuios@tutanota.com
Don’t forget to include your code in the email:
{code_1401:smjErehmmb8LN/ANr+7IThQKwUq3HbWCnh6hI5U0QmCXxlLi+E
vx5Fcfp3p4q8GUCIEw9pQzIHugCWZqozxmIES39ohGqXRDXKkv
Ri/rJHtNC3J8BRvrrbqFYkJrDrwLLBBK7127c3qEyJf8EyOXhn
WNQ7dH6oAO6qAejWIE0XH73AqHeQ1hiAeiB3U7vviDKLzYTG9z
V/DoxL9iM4CUbz8ZtVpqeIO7mw0OWcsx5oHkXVqGXg1SziRPKT
d58WyzVj5niEeKrAlRhd9eJb00pEtFcw==}

You should NOT under any circumstances pay any ransom sum.

The extortionists want you to pay a ransom for the alleged restoration of your files, same as with a lot of cryptoviruses. NetWalker ransomware could make entries in the Windows Registry to achieve persistence, and could launch or repress processes in a Windows system. All encrypted will receive the .mailto extension alongside an email address. That extension will be placed as a secondary one to each file. Audio, video, image files as well as documents, backups and banking data can be encrypted by the ransomware.

The NetWalker Ransomware Virus could be set to erase all the Shadow Volume Copies from the Windows operating system with the help of the following command:

→vssadmin.exe delete shadows /all /Quiet

If your computer device was infected with this ransomware and your files are locked, read on through to find out how you could potentially restore your files back to normal.

Remove NetWalker Ransomware Cryptovirus

If your computer got infected with the NetWalker Ransomware, you should have a bit of experience in removing malware. You should get rid of this ransomware as quickly as possible before it can have the chance to spread further and infect other computers. You should remove the ransomware and follow the step-by-step instructions guide provided below.

Tsetso Mihailov

Tsetso Mihailov

Tsetso Mihailov is a tech-geek and loves everything that is tech-related, while observing the latest news surrounding technologies. He has worked in IT before, as a system administrator and a computer repair technician. Dealing with malware since his teens, he is determined to spread word about the latest threats revolving around computer security.

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Windows Mac OS X

How to Remove NetWalker from Windows.


Step 1: Boot Your PC In Safe Mode to isolate and remove NetWalker

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 NetWalker 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 NetWalker 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 NetWalker 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 NetWalker 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 NetWalker.

Ransomware infections and NetWalker 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:

If the above link does not work for you and your region, try the other two links below, that lead to the same product:

and

2. On the download page, click on the "Download" button:

3. Click on "Save File" button:

4. Accept all agreements and click "Next":

5. After all the "Next" steps, click on "Install" and then wait for the installation to complete:

6. Run the software. Click on the location to scan for missing or deleted files and click on "Scan":

7. Wait for the scan to complete, it may take some time. Be advised that this scan is not 100% guaranteed to recover all files, but it does have some chance to get your data back:


Windows Mac OS X

Get rid of NetWalker from Mac OS X.


Step 1: Uninstall NetWalker 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 NetWalker:

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 NetWalker. 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 NetWalker. 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 NetWalker 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 NetWalker. 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.


Step 2: Scan for and remove NetWalker files from your Mac

When you are facing problems on your Mac as a result of unwanted scripts and programs such as NetWalker, the recommended way of eliminating the threat is by using an anti-malware program. Combo Cleaner offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.


Step 3 (Optional): Try to Restore Files Encrypted by NetWalker on your Mac.

Ransomware for Mac NetWalker aims to encode all your files using an encryption algorithm which may be very difficult to decode, unless you pay money. This is why we have suggested a data recovery method that may help you go around direct decryption and try to restore your files, but only in some cases. 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 recommended Data Recovery Mac app by clicking on the link underneath:

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