Ransomware Research
VirLock Ransomware
VirLock is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2016, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: NSB, ViraLock.
Quick Facts
- Ransomware Family
- VirLock
- First Seen
- February 1, 2016
- Known Aliases
- NSBViraLock
How VirLock Ransomware Works
Targeted Files
When such a file is launched for execution, it decrypts the original file, writes it to the current directory and opens it.
File Encryption Patterns
VirLock modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..exeRansom Note and Payment Demands
After encrypting files, VirLock displays ransom notes demanding payment for file recovery:
Ransom message:
notes/note.txt
Note locations:
LoginTechnical Indicators
Associated Executable Files
The following executable files are associated with VirLock ransomware:
myfile.exeWin64.Trojan.GreenBugUoQoIUwsDMQM.exeVwgC.exeVirlock3.exeVirlock Ransomware.exevirlock.exeVirlock.exevirlock (1).exeVirlock2.exe
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About This Analysis
This VirLock 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 VirLock.
Last updated: July 30, 2025