Ransomware Research

GandCrab-5 Ransomware

GandCrab-5 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2018, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
GandCrab-5
First Seen
September 1, 2018

How GandCrab-5 Ransomware Works

Targeted Files

https://app.any.run/tasks/1084c686-2699-40c1-ae9e-02eb3f690ba9/ https://app.any.run/tasks/1edf6703-6350-46fe-82e2-737f003fb127/ https://www.bleepingcomputer.com/forums/t/669484/gandcrab-ransomware-help-support-topic-gdcb-crab-crab-decrypttxt/page-18#entry4581956

File Encryption Patterns

GandCrab-5 modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

./\.[A-Z]{5}$/./\.[A-Z]{5,10}$/

Ransom Note and Payment Demands

After encrypting files, GandCrab-5 displays ransom notes demanding payment for file recovery:

file/^[A-Z]{5}-DECRYPT\.html$/

Ransom message:

notes/IHBDH-DECRYPT.html

Note locations:

EveryFolder
file/^[A-Z]{5,10}-DECRYPT\.txt$/

Ransom message:

notes/RRGMSNX-DECRYPT.txt

Note locations:

EveryFolder
file/^[A-Z]{5,10}-MANUAL\.txt$/

Ransom message:

notes/LBNPTIWL-MANUAL.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with GandCrab-5 ransomware:

  • penis.exe
  • gft.exe
  • myfile.exe
  • o.exe
  • 203961046629696.exe
  • Involve.exe
  • график замены водосчетчиков.scr
  • Резюме.scr
  • счет за Аренду за сентябрь.scr
  • Товарные накладные.scr
  • Protection.exe
  • data.bin_refresh1
  • UCBCV4DG.exe
  • Emergencyexitmap.pdf[1].bin
  • Emergencyexitmap.exe
  • ELP977AS.exe
  • 53I58WVY.exe
  • menu demarrage - raccourci
  • Menu Demarrage - Raccourci
  • 11111.exe
  • youwin.exe
  • SopCast.exe
  • Crack_Extreme_Sample_Converter.exe
  • CRACK_SWEET_MIDI_PLAYER.EXE
  • GstarCAD_64bit.exe
  • Crack_ABBYY_FineReader.exe
  • Crack_Flip_PDF_Professional.exe

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About This Analysis

This GandCrab-5 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 GandCrab-5.

Last updated: July 30, 2025

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