Ransomware Research
Esmeralda Ransomware
Esmeralda is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2016, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Apocalypse-Esmeralda.
Quick Facts
- Ransomware Family
- Esmeralda
- First Seen
- October 1, 2016
- Known Aliases
- Apocalypse-Esmeralda
How Esmeralda Ransomware Works
File Encryption Patterns
Esmeralda modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..encryptedRansom Note and Payment Demands
After encrypting files, Esmeralda displays ransom notes demanding payment for file recovery:
{origin_filename}.How_To_Decrypt.txtRansom message:
notes/magic.mgc.How_To_Decrypt.txt
Note locations:
EveryFileTechnical Indicators
Associated Executable Files
The following executable files are associated with Esmeralda ransomware:
explorerEXPLORER.EXE.MUI
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About This Analysis
This Esmeralda 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 Esmeralda.
Last updated: July 30, 2025