Ransomware Research

Hermes837 Ransomware

Hermes837 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2019, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Haka, Cobain, Jenkins, Voyager, Hendrix, Dragon.

Quick Facts

Ransomware Family
Hermes837
First Seen
September 1, 2019
Known Aliases
HakaCobainJenkinsVoyagerHendrixDragon

How Hermes837 Ransomware Works

Targeted Files

Encrypts different blocks 0x20000, 0x40000 bytes

File Encryption Patterns

Hermes837 modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..hermes837..haka..cobain..jenkins..voyager..hendrix..dragon

Ransom Note and Payment Demands

After encrypting files, Hermes837 displays ransom notes demanding payment for file recovery:

file!!!READ_ME_FIRST!!!.txt

Ransom message:

notes/!!!READ_ME_FIRST!!!.txt

Note locations:

EveryFolder
file!!!READ_ME!!!.txt

Ransom message:

notes/!!!READ_ME!!!.txt

Note locations:

EveryFolder
file!READ_ME.txt

Ransom message:

notes/!READ_ME.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with Hermes837 ransomware:

  • jenkins_en.exe
  • voyager_en.exe

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About This Analysis

This Hermes837 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 Hermes837.

Last updated: July 30, 2025

Hermes837 Ransomware - Detectable by Elastio