Ransomware Research
CryptoMix-Shark Ransomware
CryptoMix-Shark is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2017, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Shark.
Quick Facts
- Ransomware Family
- CryptoMix-Shark
- First Seen
- September 1, 2017
- Known Aliases
- Shark
How CryptoMix-Shark Ransomware Works
Targeted Files
Encrypts filenames -> 20EBFE76050B7DF050AB896F08AA5C08.SHARK
File Encryption Patterns
CryptoMix-Shark modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..SHARKRansom Note and Payment Demands
After encrypting files, CryptoMix-Shark displays ransom notes demanding payment for file recovery:
_HELP_INSTRUCTION.TXTRansom message:
notes/_HELP_INSTRUCTION.TXT
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with CryptoMix-Shark ransomware:
explorer.exe
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About This Analysis
This CryptoMix-Shark 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 CryptoMix-Shark.
Last updated: July 30, 2025