Ransomware Research
Usr0 Ransomware
Usr0 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Usr0
- First Seen
- February 1, 2017
How Usr0 Ransomware Works
File Encryption Patterns
Usr0 modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..usr0Ransom Note and Payment Demands
After encrypting files, Usr0 displays ransom notes demanding payment for file recovery:
Важная информация.txtRansom message:
notes/Важная информация.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Usr0 ransomware:
1cv8s.exe
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About This Analysis
This Usr0 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 Usr0.
Last updated: July 30, 2025