Ransomware Research
YYYYBJQOQDU Ransomware
YYYYBJQOQDU is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on March 1, 2019, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Unnamed Chinese.
Quick Facts
- Ransomware Family
- YYYYBJQOQDU
- First Seen
- March 1, 2019
- Known Aliases
- Unnamed Chinese
How YYYYBJQOQDU Ransomware Works
Targeted Files
NOSAMPLE https://www.bleepingcomputer.com/forums/t/701616/infected-by-extension-oookjyhctvdf-helpertfwnogf/
File Encryption Patterns
YYYYBJQOQDU modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.[A-Z]{10,12}$/Ransom Note and Payment Demands
After encrypting files, YYYYBJQOQDU displays ransom notes demanding payment for file recovery:
YOUR FILES ARE ENCRYPTED.TXTRansom message:
notes/YOUR FILES ARE ENCRYPTED.TXT
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About This Analysis
This YYYYBJQOQDU 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 YYYYBJQOQDU.
Last updated: July 30, 2025