Ransomware Research

UkrainianBug Ransomware

UkrainianBug is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2021, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
UkrainianBug
First Seen
September 1, 2021

How UkrainianBug Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

..bugs

Ransom Note and Payment Demands

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

file1ВАЖЛИВА ІНФОРМАЦІЯ!!!.txt

Ransom message:

notes/1ВАЖЛИВА ІНФОРМАЦІЯ!!!.txt
file2ВАЖЛИВА ІНФОРМАЦІЯ!!!.txt

Ransom message:

notes/1ВАЖЛИВА ІНФОРМАЦІЯ!!!.txt

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About This Analysis

This UkrainianBug 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 UkrainianBug.

Last updated: October 30, 2025

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