Ransomware Research
Helldown Ransomware
Helldown is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2024, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Helldown
- First Seen
- October 1, 2024
How Helldown Ransomware Works
File Encryption Patterns
Helldown modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.[a-zA-Z]{4}$/Ransom Note and Payment Demands
After encrypting files, Helldown displays ransom notes demanding payment for file recovery:
/^Readme\.[a-zA-Z]{4}\.txt$/Ransom message:
notes/Readme.uQlf.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Helldown ransomware:
h.exe
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About This Analysis
This Helldown 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 Helldown.
Last updated: July 30, 2025