Ransomware Research

BACKJOHN Ransomware

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

Quick Facts

Ransomware Family
BACKJOHN
First Seen
March 1, 2023

How BACKJOHN Ransomware Works

Targeted Files

Full extension -> .id[C63F241F-3143].[backjohn131@gmail.com].BACKJOHN

File Encryption Patterns

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

File extensions added after encryption:

..BACKJOHN

Ransom Note and Payment Demands

After encrypting files, BACKJOHN 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:

RootDiscsDesktop

Technical Indicators

Associated Executable Files

The following executable files are associated with BACKJOHN ransomware:

  • software.exe
  • JC7yn1Dzu8.exe

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About This Analysis

This BACKJOHN 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 BACKJOHN.

Last updated: July 30, 2025

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