Ransomware Research
Uh-Oh Ransomware
Uh-Oh is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: JGY.
Quick Facts
- Ransomware Family
- Uh-Oh
- First Seen
- December 1, 2020
- Known Aliases
- JGY
How Uh-Oh Ransomware Works
Targeted Files
Encrypts filenames Ex.encrypted filename -> "k(vJA^^Pga.jgy"
File Encryption Patterns
Uh-Oh modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..jgyRansom Note and Payment Demands
After encrypting files, Uh-Oh 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 Uh-Oh ransomware:
JGY.exeChromio.exe
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About This Analysis
This Uh-Oh 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 Uh-Oh.
Last updated: July 30, 2025