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

File modification behavior

ChiChi updates file modification timestamps after encryption.

File encryption patterns

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

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
notes/Guide To Recover Your Files.txt

Location: EveryFolder

fileHowToDecrypt.txt
notes/HowToDecrypt.txt

Location: RootDiscs, Desktop

Technical indicators

Associated executable files

The following executable files are associated with ChiChi ransomware:

  • e_win.exe

About this analysis

This ChiChi ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery, helping organizations defend against and recover from ransomware attacks like ChiChi.

Last updated: May 7, 2025

Detection coverage

Elastio detects ChiChi inside your data and backups.

The Hunt Engine uses Deep File Inspection to identify ChiChi across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a hunt against your recovery points to confirm.