Ransomware Research

Osno Ransomware

Osno is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Babax-Osno.

Quick Facts

Ransomware Family
Osno
First Seen
October 1, 2020
Known Aliases
Babax-Osno

How Osno Ransomware Works

Targeted Files

Destroys contents of the files

File Encryption Patterns

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

File extensions added after encryption:

..osnoed

Ransom Note and Payment Demands

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

fileRecInstruct.osnoned

Ransom message:

notes/RecInstruct.osnoned

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with Osno ransomware:

  • CardGame.exe
  • osno-crypted.exe
  • Chrome updaters.exe
  • FallGuysStats.exe
  • chrome updaters.exe
  • Osno.exe
  • 610689
  • Osno_Builder_v2.1.5.rar

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About This Analysis

This Osno 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 Osno.

Last updated: July 30, 2025

Osno Ransomware - Detectable by Elastio