Ransomware Research
First Ransomware
First is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on January 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- First
- First Seen
- January 1, 2017
How First Ransomware Works
Targeted Files
https://twitter.com/JaromirHorejsi/status/815949909648150528
File Encryption Patterns
First modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..locked..krzysiokaRansom Note and Payment Demands
After encrypting files, First displays ransom notes demanding payment for file recovery:
READ_IT.txtRansom message:
notes/READ_IT.txt
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with First ransomware:
firstransomware.exe
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About This Analysis
This First 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 First.
Last updated: July 30, 2025