Ransomware Research

Netwalker Ransomware

Netwalker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2019, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Mailto, Koko, NetWalker Doxware.

Quick Facts

Ransomware Family
Netwalker
First Seen
September 1, 2019
Known Aliases
MailtoKokoNetWalker Doxware

How Netwalker Ransomware Works

Targeted Files

Encrypts first 0xC800 bytes Template for extension -> .mailto[<email_ransom>].<random{4-6}> Some samples can do RESET for modified_date 9a601b6a24298764d589e0d9bf5d48ab0a3f472e013ce0480dd87f60083549b1 -> PowerShell

File Encryption Patterns

Netwalker modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

./\.[A-F0-9a-f]{4,6}$/

Ransom Note and Payment Demands

After encrypting files, Netwalker displays ransom notes demanding payment for file recovery:

file/^[A-F0-9a-f]{5,6}-Readme\.txt$/

Ransom message:

notes/5E728-Readme.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with Netwalker ransomware:

  • 212fe44ced.exe
  • 2c08f5ca36.exe
  • 364f57fd.exe
  • f1cd57bf.exe
  • 54101b5d.exe
  • 22.exe
  • 1c34c545.exe
  • 99e00f24.exe
  • e52eea98.exe
  • ccddc65d.exe
  • 96c196eb.exe
  • wwllww.vexe
  • 430f3cda.exe
  • 722b6392.exe
  • ef3ff3f0.exe
  • 2001.exe
  • myvtfile.exe
  • CORONAVIRUS_COVID-19.vbs
  • all.ps1
  • Ransomware.ps1
  • dante.ps1
  • Ransomware (1).ps1
  • ned2.ps1
  • pay.ps1
  • oopsNO.ps1
  • skyfall_user wilsonk_wilsonk_ste.txt.ps1
  • Based
  • grips.exe
  • rdp__bd__60__1905346__1607274786.exe
  • rdp__bd__60__1905346__1607274786.bin
  • ntwlk.ps1
  • CORONAVIRUS_COVID-19.vbs (myvtfile.exe)
  • Bedeva Hack.exe

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About This Analysis

This Netwalker ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery solutions, helping organizations defend against and recover from ransomware attacks like Netwalker.

Last updated: July 30, 2025

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