Ransomware Research
LowLevel04 Ransomware
LowLevel04 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2015, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: OORR.
Quick Facts
- Ransomware Family
- LowLevel04
- First Seen
- October 1, 2015
- Known Aliases
- OORR
How LowLevel04 Ransomware Works
Targeted Files
https://securityaffairs.com/41320/cyber-crime/lowlevel04-ransomware-remote-desktop.html https://www.bleepingcomputer.com/news/security/help-recover-files-txt-ransomware-installed-by-targeted-terminal-services-attacks/
File Encryption Patterns
LowLevel04 modifies encrypted files using specific patterns to mark them as encrypted:
Prefixes added to encrypted files:
oorr.Ransom Note and Payment Demands
After encrypting files, LowLevel04 displays ransom notes demanding payment for file recovery:
help recover files.txtRansom message:
notes/help recover files.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with LowLevel04 ransomware:
date.exe
Elastio Can Help You
Don't let LowLevel04 ransomware take over your data
Elastio provides advanced ransomware protection and recovery solutions to keep your organization safe.
About This Analysis
This LowLevel04 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 LowLevel04.
Last updated: July 30, 2025