Ransomware Research
Locked-In Ransomware
Locked-In is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2016, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: NoValid.
Quick Facts
- Ransomware Family
- Locked-In
- First Seen
- December 1, 2016
- Known Aliases
- NoValid
How Locked-In Ransomware Works
File Encryption Patterns
Locked-In modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..novalid./\.[A-Za-z0-9]{5,14}/Ransom Note and Payment Demands
After encrypting files, Locked-In displays ransom notes demanding payment for file recovery:
RESTORE_CORUPTED_FILES.HTMLRansom message:
notes/RESTORE_CORUPTED_FILES.HTML
Note locations:
EveryFolderRESTORE_NOVALID_FILES.HTMLTechnical Indicators
Associated Executable Files
The following executable files are associated with Locked-In ransomware:
multibyte.exe
Recovery and Decryption Tools
Good news! Decryption tools are available for Locked-In ransomware:
0
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About This Analysis
This Locked-In 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 Locked-In.
Last updated: July 30, 2025