Ransomware Research
EncFileSOS Ransomware
EncFileSOS is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2013, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- EncFileSOS
- First Seen
- October 1, 2013
How EncFileSOS Ransomware Works
File Encryption Patterns
EncFileSOS modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..encfilesos@aol.comRansom Note and Payment Demands
After encrypting files, EncFileSOS displays ransom notes demanding payment for file recovery:
KAK_PАCШИФPOBATЬ_ВАШИ_ФAЙЛЫ.TXTRansom message:
notes/KAK_PАCШИФPOBATЬ_ВАШИ_ФAЙЛЫ.TXT
Elastio Can Help You
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About This Analysis
This EncFileSOS 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 EncFileSOS.
Last updated: July 30, 2025