Ransomware Research

Babuk Ransomware

Babuk is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2020, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Babuk
First Seen
December 1, 2020

How Babuk Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

..__NIST_K571__..babyk..doydo..encrypted..Rook..blastoise..cyber..kings..ljubi..democ..AstraLocker..zazas..crypt..Astra..babuk2..piton..delta

Ransom Note and Payment Demands

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

fileHow To Restore Your Files.txt

Ransom message:

notes/How To Restore Your Files.txt

Note locations:

EveryFolder
fileHelp Restore Your Files.txt

Ransom message:

notes/Help Restore Your Files.txt

Note locations:

EveryFolder
fileDECR.TXT

Note locations:

EveryFolder
fileHowToRestoreYourFiles.txt

Note locations:

EveryFolder
fileRestore Your Files.txt

Note locations:

EveryFolder
fileRestore Files.txt

Note locations:

EveryFolder
fileRestoreFiles.txt

Note locations:

EveryFolder
fileRecover_Your_Files.html

Note locations:

EveryFolder
fileHow_To_Restore_Your_Files.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with Babuk ransomware:

  • serco.exe
  • crypto.exe
  • r_server.exe
  • servspool.exe
  • kings.exe
  • Stage1.exe
  • RS_Doydo.exe
  • orion.exe
  • update.exe

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About This Analysis

This Babuk 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 Babuk.

Last updated: October 30, 2025

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