Ransomware Research

Cuba Ransomware

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

Quick Facts

Ransomware Family
Cuba
First Seen
January 1, 2020

How Cuba Ransomware Works

Targeted Files

Encrypts first 1Mb

File Encryption Patterns

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

File extensions added after encryption:

..cuba

Ransom Note and Payment Demands

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

file!!! ALL YOUR FILES ARE ENCRYPTED !!!.TXT

Ransom message:

notes/!!! ALL YOUR FILES ARE ENCRYPTED !!!.TXT
file!!FAQ for Decryption!!.txt

Ransom message:

notes/!!FAQ for Decryption!!.txt

Note locations:

EveryFolder
file!! READ ME !!.txt

Ransom message:

notes/!! READ ME !!.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with Cuba ransomware:

  • listdrop
  • listdrop.exe
  • ITCGroup.exe
  • 438419.exe
  • CC.exe
  • kalt.exe
  • test.exe
  • cuba.exe
  • 483560.exe
  • cuba fidel Ransomware.exe
  • 1.exe

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About This Analysis

This Cuba 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 Cuba.

Last updated: July 30, 2025

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