The Backdoor Factory (BDF) – Patch Binaries With Shellcode


The Backdoor Factory or BDF is a tool which enables you to patch binaries with shellcode and continue normal execution exactly as the executable binary would have in its’ pre-patched state.

The Backdoor Factory (BDF) - Patch Binaries With Shellcode


Some executables have built in protection, as such this tool will not work on all binaries. It is advisable that you test target binaries before deploying them to clients or using them in exercises.

There’s a couple of somewhat related tools you can also check out:

peinjector – MITM PE File Injector
PEiD – Detect PE Packers, Cryptors & Compilers

Features of Backdoor Factory

Overall BDF Features

The user can:

  • Provide custom shellcode.
  • Patch a directory of executables/dlls.
  • Select x32 or x64 binaries to patch only.
  • Include BDF is other python projects see pebin.py and elfbin.py

PE File Related Backdoor-Factory Features

  • Can find all codecaves in an EXE/DLL.
  • By default, clears the pointer to the PE certificate table, thereby unsigning a binary.
  • Can inject shellcode into code caves or into a new section.
  • Can find if a PE binary needs to run with elevated privileges.
  • When selecting code caves, you can use the following commands:
    • Jump (j), for code cave jumping
    • Single (s), for patching all your shellcode into one cave
    • Append (a), for creating a code cave
    • Ignore (i or q), nevermind, ignore this binary
  • Can ignore DLLs
  • Import Table Patching
  • AutoPatching (-m automtic)
  • Onionduke (-m onionduke)

ELF Files Backdoor Feature

Extends 1000 bytes (in bytes) to the TEXT SEGMENT and injects shellcode into that section of code.

Mach-O Files

Pre-Text Section patching and signature removal


The Backdoor Factory Usage

You can download Backdoor Factory here:

the-backdoor-factory-3.4.2.zip

Or read more here.

Posted in: Hacking Tools


Latest Posts:


Sooty - SOC Analyst All-In-One CLI Tool Sooty – SOC Analyst All-In-One CLI Tool
Sooty is a tool developed with the task of aiding a SOC analyst to automate parts of their workflow and speed up their process.
UBoat - Proof Of Concept PoC HTTP Botnet Project UBoat – Proof Of Concept PoC HTTP Botnet Project
UBoat is a PoC HTTP Botnet designed to replicate a full weaponised commercial botnet like the famous large scale infectors Festi, Grum, Zeus and SpyEye.
LambdaGuard - AWS Lambda Serverless Security Scanner LambdaGuard – AWS Lambda Serverless Security Scanner
LambdaGuard is a tool which allows you to visualise and audit the security of your serverless assets, an open-source AWS Lambda Serverless Security Scanner.
exe2powershell - Convert EXE to BAT Files exe2powershell – Convert EXE to BAT Files
exe2powershell is used to convert EXE to BAT files, the previously well known tool for this was exe2bat, this is a version for modern Windows.
HiddenWall - Create Hidden Kernel Modules HiddenWall – Create Hidden Kernel Modules
HiddenWall is a Linux kernel module generator used to create hidden kernel modules to protect your server from attackers.
Anteater - CI/CD Security Gate Check Framework Anteater – CI/CD Security Gate Check Framework
Anteater is a CI/CD Security Gate Check Framework to prevent the unwanted merging of filenames, binaries, deprecated functions, staging variables and more.


Comments are closed.