Ransomware Research

AnonTsugumi Ransomware

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

Quick Facts

Ransomware Family
AnonTsugumi
First Seen
September 1, 2023

How AnonTsugumi Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

..anontsugumi

Ransom Note and Payment Demands

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

fileREADME.txt

Ransom message:

notes/README.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with AnonTsugumi ransomware:

  • anon.exe
  • svchost.exe
  • JJoIMcbu9pOmnpU.exe

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About This Analysis

This AnonTsugumi 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 AnonTsugumi.

Last updated: July 30, 2025

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