Ransomware Research
MountLocker Ransomware
MountLocker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Mount Locker, Cbtucyny, SunRise Locker, AstroLocker, XingLocker.
Quick Facts
- Ransomware Family
- MountLocker
- First Seen
- October 1, 2020
- Known Aliases
- Mount LockerCbtucynySunRise LockerAstroLockerXingLocker
How MountLocker Ransomware Works
Targeted Files
https://bazaar.abuse.ch/browse/tag/MountLocker parameter to start DLL -> DllRegisterServer
File Encryption Patterns
MountLocker modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.ReadManual\.[A-F0-9]{8}$/Ransom Note and Payment Demands
After encrypting files, MountLocker displays ransom notes demanding payment for file recovery:
RecoveryManual.htmlRansom message:
notes/RecoveryManual.html
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with MountLocker ransomware:
AzamatOutDllBreakOutBreakOut.exeXACQDAPEV.exefile.exepox64.dll
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About This Analysis
This MountLocker 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 MountLocker.
Last updated: July 30, 2025