Ransomware Research

Emsisosisoft Ransomware

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

Quick Facts

Ransomware Family
Emsisosisoft
First Seen
July 1, 2019

How Emsisosisoft Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

..emsisosisoft

Ransom Note and Payment Demands

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

fileHOW TO RESTORE ENCRYPTED FILES.TXT

Ransom message:

notes/HOW TO RESTORE ENCRYPTED FILES.TXT

Note locations:

EveryFolder

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About This Analysis

This Emsisosisoft 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 Emsisosisoft.

Last updated: October 30, 2025

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