Ransomware Research

GusCrypter Ransomware

GusCrypter is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2018, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
GusCrypter
First Seen
October 1, 2018

How GusCrypter Ransomware Works

Targeted Files

Encypts each 4th byte https://app.any.run/tasks/1236af1e-10bb-463d-b727-0cc914f559e2/

File Encryption Patterns

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

File extensions added after encryption:

..GUSv2..bip

Ransom Note and Payment Demands

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

fileDECRYPT.html

Ransom message:

notes/DECRYPT.html

Note locations:

EveryFolder
fileInformation.html

Ransom message:

notes/Information.html

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with GusCrypter ransomware:

  • GusCrypter.exe
  • crypt.exe

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About This Analysis

This GusCrypter 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 GusCrypter.

Last updated: July 30, 2025

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