Ransomware Research
CNH Ransomware
CNH is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2021, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: CNHelp, ChinaHelper, CNHelp.
Quick Facts
- Ransomware Family
- CNH
- First Seen
- January 1, 2021
- Known Aliases
- CNHelpChinaHelperCNHelp
How CNH Ransomware Works
Targeted Files
written in Rust. For x64 OS Encrypts first 1 Mb
File Encryption Patterns
CNH modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..cnh..cnhelpRansom Note and Payment Demands
After encrypting files, CNH displays ransom notes demanding payment for file recovery:
README.txtRansom message:
notes/README.txt
Note locations:
EveryFolderHOW_TO_RETURN_FILES.txtRansom message:
notes/HOW_TO_RETURN_FILES.txt
Note locations:
EveryFolderElastio Can Help You
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About This Analysis
This CNH 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 CNH.
Last updated: July 30, 2025