Ransomware Research

LambdaLocker Ransomware

LambdaLocker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2017, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
LambdaLocker
First Seen
February 1, 2017

How LambdaLocker Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

..lambda_l0cked..MyChemicalRomance4EVER

Ransom Note and Payment Demands

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

file!UNLOCK_guiDE.tXT

Ransom message:

notes/!UNLOCK_guiDE.tXT

Note locations:

EveryFolder
fileREAD_IT.hTmL

Ransom message:

notes/READ_IT.hTmL

Note locations:

RootDirectory
fileREAD_IT.Lnk

Note locations:

Desktop
file#Cyb3rGh0st_S0c13tyF@ck3r

Ransom message:

notes/#Cyb3rGh0st_S0c13tyF@ck3r

Note locations:

Desktop
file!A_NOTICE_FROM_LAST

Ransom message:

notes/!A_NOTICE_FROM_LAST

Note locations:

RootDirectory

Technical Indicators

Associated Executable Files

The following executable files are associated with LambdaLocker ransomware:

  • RS_LambdaLocker.exe
  • reloader.exe
  • LambdaLocker.exe
  • baiduyunSimple.exe
  • baiduyunSimple（ransomware）.exe
  • kukuvruku.exe
  • ransomware Python LambdaLocker
  • ooo
  • ruku_v_kuku_.exe
  • 1-6.exe
  • jkv.exe
  • ruku_v_kuku
  • Ransomware_Decryptor.exe
  • cracker.exe
  • VortexVPN.exe
  • VortexVPN.vir.DNvir
  • VORTEXVPN.EXE
  • systern.exe

Recovery and Decryption Tools

Good news! Decryption tools are available for LambdaLocker ransomware:

0

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About This Analysis

This LambdaLocker 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 LambdaLocker.

Last updated: July 30, 2025

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What is LambdaLocker Ransomware? | Elastio