Ransomware Research

T1Happy Ransomware

T1Happy is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2019, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
T1Happy
First Seen
January 1, 2019

How T1Happy Ransomware Works

File Encryption Patterns

T1Happy modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..happy

Ransom Note and Payment Demands

After encrypting files, T1Happy displays ransom notes demanding payment for file recovery:

fileHIT BY RANSOMWARE.txt

Ransom message:

notes/HIT BY RANSOMWARE.txt

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with T1Happy ransomware:

  • a.exe
  • T1.exe
  • T1.bin
  • b.exe
  • happy2.exe
  • d.exe
  • happy4.exe
  • c.exe
  • happy3.exe

Elastio Can Help You

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About This Analysis

This T1Happy 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 T1Happy.

Last updated: July 30, 2025