Ransomware Research
BlackSun Ransomware
BlackSun 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
- BlackSun
- First Seen
- September 1, 2021
How BlackSun Ransomware Works
Targeted Files
Written in PowerShell
File Encryption Patterns
BlackSun modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..BlackSunRansom Note and Payment Demands
After encrypting files, BlackSun displays ransom notes demanding payment for file recovery:
BlackSun_README.txtRansom message:
notes/BlackSun_README.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with BlackSun ransomware:
BlackSun.ps1
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About This Analysis
This BlackSun 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 BlackSun.
Last updated: July 30, 2025