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
How Crypt12 ransomware works
File encryption patterns
Crypt12 modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, Crypt12 displays ransom notes demanding payment for file recovery:
notes/!!!!readme!!!.txt
Technical indicators
Associated executable files
The following executable files are associated with Crypt12 ransomware:
- crypt12.exe
- KristinaCS.exe
- 8b0277d23796c4cc.exe
Recovery and decryption tools
Decryption tools may be available for Crypt12. Review the resources below:
About this analysis
This Crypt12 ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery, helping organizations defend against and recover from ransomware attacks like Crypt12.
Last updated: December 30, 2025
Elastio detects Crypt12 inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify Crypt12 across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a scan against your recovery points to confirm.
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