Ransomware Research
Rontok Ransomware
Rontok is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2019, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Borontok, B0r0nt0K.
Quick Facts
- Ransomware Family
- Rontok
- First Seen
- February 1, 2019
- Known Aliases
- BorontokB0r0nt0K
How Rontok Ransomware Works
Targeted Files
NOSAMPLE Encrypts filenames with base64;for web-sites
File Encryption Patterns
Rontok modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..rontokRansom Note and Payment Demands
After encrypting files, Rontok displays ransom notes demanding payment for file recovery:
Ransom message:
notes/note.txt
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About This Analysis
This Rontok 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 Rontok.
Last updated: July 30, 2025