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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:
DECRYPT.html
Ransom message:
notes/DECRYPT.html
Note locations:
EveryFolder
Information.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
Elastio Can Help You
Don't let GusCrypter ransomware take over your data
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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