Ransomware Research
SZ40 Ransomware
SZ40 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2021, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Lorenz, Lorenz (SZ40) Doxware.
Quick Facts
- Ransomware Family
- SZ40
- First Seen
- April 1, 2021
- Known Aliases
- LorenzLorenz (SZ40) Doxware
How SZ40 Ransomware Works
File Encryption Patterns
SZ40 modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..sz40Ransom Note and Payment Demands
After encrypting files, SZ40 displays ransom notes demanding payment for file recovery:
HELP_SECURITY_EVENT.htmlRansom message:
notes/HELP_SECURITY_EVENT.html
Note locations:
DesktopHELP.TXTRansom message:
notes/HELP.TXT
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with SZ40 ransomware:
MoUsoCoreWorker.exedws.exeaudiodg.exe
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About This Analysis
This SZ40 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 SZ40.
Last updated: July 30, 2025