Ransomware Research
Crypt12 Ransomware
Crypt12 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on August 1, 2017, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: KristinaCS.
Quick Facts
- Ransomware Family
- Crypt12
- First Seen
- August 1, 2017
- Known Aliases
- KristinaCS
How Crypt12 Ransomware Works
File Encryption Patterns
Crypt12 modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..crypt12Ransom Note and Payment Demands
After encrypting files, Crypt12 displays ransom notes demanding payment for file recovery:
!!!!readme!!!.txtRansom message:
notes/!!!!readme!!!.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Crypt12 ransomware:
crypt12.exeKristinaCS.exe8b0277d23796c4cc.exe
Recovery and Decryption Tools
Good news! Decryption tools are available for Crypt12 ransomware:
0
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About This Analysis
This Crypt12 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 Crypt12.
Last updated: July 30, 2025