Ransomware Research
CryptNet Ransomware
CryptNet is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2023, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- CryptNet
- First Seen
- April 1, 2023
How CryptNet Ransomware Works
Targeted Files
Protected with .NET Reactor
File Encryption Patterns
CryptNet modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.[a-zA-Z0-9]{5}\b/Ransom Note and Payment Demands
After encrypting files, CryptNet displays ransom notes demanding payment for file recovery:
/^RESTORE-FILES-[a-zA-Z0-9]{9}\.txt\b/Ransom message:
notes/RESTORE-FILES-alvcEUbBY.txt
Note locations:
EveryFolderRansom message:
notes/4Gr96yM3F.jpg
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with CryptNet ransomware:
encrypt.exe1680679592404.exe
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About This Analysis
This CryptNet 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 CryptNet.
Last updated: July 30, 2025