Update May 12, 2020: Ransomware released a major update, including the automatic publication of victim data, unlocking processes (using the Restart Manager API), PowerShell assemblies, and demonstrating a million-dollar extortion earnings (for example, $1 038 491 from one victim).

What is NetWalker Ransomware

Besides targetting regular users, Kazkavkovkiz a.k.a. NetWalker a.k.a Mailto also draws its strands towards business figures. Like other ransomware, it encrypts data by assigning a unique extension and dropping a text file as a result. However, instead of using one common extension, it generates various versions according to these patterns – .mailto[kkeessnnkkaa@cock.li].{random-alphanumerical-sequence}, .mailto[sevenoneone@cock.li].{random-alphanumerical-sequence} or .mailto[kazkavkovkiz@cock.li].{random-alphanumerical-sequence}. For example, the non-affected 1.mp4 will migrate to .mailto[kazkavkovkiz@cock.li].14b1 or similarly. In the note, victims are told that their files got heavily encrypted and require a fast decision, otherwise, they will disappear forever. Malefactores have used following naming pattern for ransom note from the beginning {random id}-Readme.txt. Below are the examples of the real ransom-demanding notes.

Kazkavkovkiz RansomwareNetwalker Ransomware
Hi!
Your files are encrypted.
All encrypted files for this computer has extension: {redacted}
--
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:
{redacted}
Hi!
Your files are encrypted.
All encrypted files for this computer has extension: {redacted}
--
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.
--
Our encryption algorithms are very strong and your files are very well protected, 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 decrypter program, you may damage them and then they will be impossible to recover.
For us this is just business and to prove to you our seriousness, we will decrypt you one file for free.
Just open our website, upload the encrypted file and get the decrypted file for free.
--
Steps to get access on our website:
1.Download and install tor-browser: https://torproject.org/
2.Open our website: rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion
3.Put your personal code in the input form:{redacted}

Also, shutting/rebooting your PC or any other manipulations will lead to permanent data loss. To get your files back, you should contact them via e-mail by attaching your personal code and pay for decryption software in Bitcoin. Unfortunately, decrypting files without cybercriminal’s involvement is nigh to impossible unless there are bugs or errors in the program. Therefore, we will still try to decrypt it and surely delete NetWalker Ransomware from your PC down below.

netwalker (mailto) ransomware

How NetWalker Ransomware infected your computer

Most users might not be aware that ransomware developers abuse multiple channels for infecting users. Most popular are via e-mail spam messages, fake software cracking tools, trojans, and other untrustworthy downloads. Do not open files or follow the steps of unknown figures. Those messages that contain attachments and marked as important are typically infected with malware. Such methods are frequently established by third-parties to earn additional cash from successful ransom operation. If you are looking for complex ransomware protection, then you should opt for SpyHunter 5 by EnigmaSoftware. The constantly-updated database will keep your PC protected against up-to-date threats.

  1. Download Netwalker Ransomware Removal Tool
  2. Get decryption tool for .mailto files
  3. Recover encrypted files with Stellar Data Recovery Professional
  4. Restore encrypted files with Windows Previous Versions
  5. Restore files with Shadow Explorer
  6. How to protect from threats like Netwalker Ransomware

Download Removal Tool

Download Removal Tool

To remove Netwalker Ransomware completely, we recommend you to use WiperSoft AntiSpyware from WiperSoft. It detects and removes all files, folders and registry keys of Netwalker Ransomware and prevents future infections by similar viruses.

Alternative Removal Tool

Download SpyHunter 5

To remove Netwalker Ransomware completely, we recommend you to use SpyHunter 5 from EnigmaSoft Limited. It detects and removes all files, folders and registry keys of Netwalker Ransomware. The trial version of SpyHunter 5 offers virus scan and 1-time removal for FREE.

Netwalker Ransomware files:


How To Unlock Files.txt
{randomfilename}.exe

Netwalker Ransomware registry keys:

no information

How to decrypt and restore .mailto files

Use automated decryptors

Download Kaspersky RakhniDecryptor

kaspersky dharma ransomware decryptor

Use following tool from Kaspersky called Rakhni Decryptor, that can decrypt .mailto files. Download it here:

Download RakhniDecryptor

There is no purpose to pay the ransom because there is no guarantee you will receive the key, but you will put your bank credentials at risk.

Dr.Web Rescue Pack

Famous antivirus vendor Dr. Web provides free decryption service for the owners of its products: Dr.Web Security Space or Dr.Web Enterprise Security Suite. Other users can ask for help in the decryption of .mailto files by uploading samples to Dr. Web Ransomware Decryption Service. Analyzing of files will be performed free of charge and if files are decryptable, all you need to do is purchase a 2-year license of Dr.Web Security Space worth $120 or less. Otherwise, you don’t have to pay.

If you are infected with Netwalker Ransomware and removed it from your computer you can try to decrypt your files. Antivirus vendors and individuals create free decryptors for some crypto-lockers. To attempt to decrypt them manually you can do the following:

Use Stellar Data Recovery Professional to restore .mailto files

stellar data recovery professional

  1. Download Stellar Data Recovery Professional.
  2. Click Recover Data button.
  3. Select type of files you want to restore and click Next button.
  4. Choose location where you would like to restore files from and click Scan button.
  5. Preview found files, choose ones you will restore and click Recover.
Download Stellar Data Recovery Professional

Using Windows Previous Versions option:

  1. Right-click on infected file and choose Properties.
  2. Select Previous Versions tab.
  3. Choose particular version of the file and click Copy.
  4. To restore the selected file and replace the existing one, click on the Restore button.
  5. In case there is no items in the list choose alternative method.

Using Shadow Explorer:

  1. Download Shadow Explorer program.
  2. Run it and you will see screen listing of all the drives and the dates that shadow copy was created.
  3. Select the drive and date that you want to restore from.
  4. Right-click on a folder name and select Export.
  5. In case there are no other dates in the list, choose alternative method.

If you are using Dropbox:

  1. Login to the DropBox website and go to the folder that contains encrypted files.
  2. Right-click on the encrypted file and select Previous Versions.
  3. Select the version of the file you wish to restore and click on the Restore button.

How to protect computer from viruses, like Netwalker Ransomware, in future

1. Get special anti-ransomware software

Use BitDefender Anti-Ransomware

bitdefender anti-ransomware

Famous antivirus vendor BitDefender released free tool, that will help you with active anti-ransomware protection, as additional shield to your current protection. It will not conflict with bigger security applications. If you are searching complete internet security solution consider upgrading to full version of BitDefender Internet Security 2018.

Download BitDefender Anti-Ransomware

2. Back up your files

idrive backup

As an additional way to save your files, we recommend online backup. Local storages, such as hard drives, SSDs, flash drives or remote network storages can be instantly infected by the virus once plugged in or connected to. Netwalker Ransomware uses some techniques to exploit this. One of the best services and programs for easy automatic online backup is iDrive. It has the most profitable terms and simple interface. You can read more about iDrive cloud backup and storage here.

3. Do not open spam e-mails and protect your mailbox

mailwasher pro

Malicious attachments to spam or phishing e-mails is most popular method of ransomware distribution. Using spam filters and creating anti-spam rules is good practice. One of the world leaders in anti-spam protection is MailWasher Pro. It works with various desktop applications, and provides very high level of anti-spam protection.

Download MailWasher Pro