Ransomware Research

CY3 Ransomware

CY3 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2023, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
CY3
First Seen
January 1, 2023

How CY3 Ransomware Works

File Encryption Patterns

CY3 modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..CY3

Ransom Note and Payment Demands

After encrypting files, CY3 displays ransom notes demanding payment for file recovery:

fileinfo.txt

Ransom message:

notes/info.txt

Note locations:

RootDiscsDesktop
fileInfo.hta

Ransom message:

notes/Info.hta

Note locations:

StartUpRoaming

Technical Indicators

Associated Executable Files

The following executable files are associated with CY3 ransomware:

  • software.exe
  • file.exe
  • program.exe
  • cyber.exe

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About This Analysis

This CY3 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 CY3.

Last updated: October 30, 2025

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What is CY3 Ransomware? | Elastio