Ransomware Research
Usr Ransomware
Usr is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on March 1, 2023, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Usr
- First Seen
- March 1, 2023
How Usr Ransomware Works
Targeted Files
Full extension -> .id[C63F241F-3449].[username@worker.com].usr
File Encryption Patterns
Usr modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..usrRansom Note and Payment Demands
After encrypting files, Usr displays ransom notes demanding payment for file recovery:
info.txtRansom message:
notes/info.txt
Note locations:
RootDiscsDesktopinfo.htaRansom message:
notes/info.hta
Note locations:
RootDiscsDesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with Usr ransomware:
BackupService.exe
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About This Analysis
This Usr 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 Usr.
Last updated: July 30, 2025