Ransomware Research

BlueSky Ransomware

BlueSky is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on June 1, 2022, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
BlueSky
First Seen
June 1, 2022

How BlueSky Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

..bluesky

Ransom Note and Payment Demands

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

file# DECRYPT FILES BLUESKY #.html

Ransom message:

notes/# DECRYPT FILES BLUESKY #.html

Note locations:

EveryFolder
file# DECRYPT FILES BLUESKY #.txt

Ransom message:

notes/# DECRYPT FILES BLUESKY #.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with BlueSky ransomware:

  • l.exe
  • javaw.exe

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About This Analysis

This BlueSky 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 BlueSky.

Last updated: July 30, 2025

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