Ransomware Research

ChiChi Ransomware

ChiChi is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2021, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
ChiChi
First Seen
November 1, 2021

How ChiChi Ransomware Works

Targeted Files

Encrypts first 2Mb 16-byte stripe encryption

File Encryption Patterns

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

File extensions added after encryption:

..chichi..zzzz

Ransom Note and Payment Demands

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

fileGuide To Recover Your Files.txt

Ransom message:

notes/Guide To Recover Your Files.txt

Note locations:

EveryFolder
fileHowToDecrypt.txt

Ransom message:

notes/HowToDecrypt.txt

Note locations:

RootDiscsDesktop

Technical Indicators

Associated Executable Files

The following executable files are associated with ChiChi ransomware:

  • e_win.exe

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About This Analysis

This ChiChi 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 ChiChi.

Last updated: July 30, 2025

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