Ransomware Research
FilesL0cker Ransomware
FilesL0cker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2018, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: FilesLocker v2.0.
Quick Facts
- Ransomware Family
- FilesL0cker
- First Seen
- September 1, 2018
- Known Aliases
- FilesLocker v2.0
How FilesL0cker Ransomware Works
File Encryption Patterns
FilesL0cker modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..locked..[fileslocker@pm.me]Ransom Note and Payment Demands
After encrypting files, FilesL0cker displays ransom notes demanding payment for file recovery:
#解密我的文件#.txtRansom message:
notes/#解密我的文件#.txt
Note locations:
RootDiscsDesktop#DECRYPT MY FILES#.txtRansom message:
notes/#DECRYPT MY FILES#.txt
Note locations:
RootDiscsDesktopRansom message:
notes/note.txt
Note locations:
LoginTechnical Indicators
Associated Executable Files
The following executable files are associated with FilesL0cker ransomware:
Windows Update.exefileslockerRansome.exeInstaller.exeINSTALLER.EXEFilesLocker.execsses3.execsses.execsses1.execsses2.exeSql49.exe
Recovery and Decryption Tools
Good news! Decryption tools are available for FilesL0cker ransomware:
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About This Analysis
This FilesL0cker 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 FilesL0cker.
Last updated: July 30, 2025