Ransomware Research

Kasiski Ransomware

Kasiski is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2017, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Kasiski
First Seen
February 1, 2017

How Kasiski Ransomware Works

Ransom Note and Payment Demands

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

fileINSTRUCCIONES.txt

Ransom message:

notes/INSTRUCCIONES.txt

Note locations:

RansomPayloadStartFolder

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About This Analysis

This Kasiski 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 Kasiski.

Last updated: October 30, 2025

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