Shellcode Template: easily modifiable shellcode template for Windows x64/x86

by do son · Published February 25, 2022 · Updated November 20, 2022

Shellcode Template

An easily modifiable shellcode template for Windows x64/x86

How does it work?

This template is heavily based on Austin Hudson’s (aka SecIdiot) TitanLdr It compiles the project into a PE Executable and extracts the .text section.

Example

The entrypoint of the shellcode looks like this. Of course, this can be changed for your need. First, we need to initialize needed libraries and functions by using our custom written GetModuleHandle and GetProcAddress.

SEC( text, B ) VOID Entry( VOID ) 

{

    INSTANCE Instance = { };



    Instance.Modules.Kernel32   = TGetModuleHandle( HASH_KERNEL32 ); 

    Instance.Modules.Ntdll      = TGetModuleHandle( HASH_NTDLL ); 



    if ( Instance.Modules.Kernel32 != NULL )

    {

        // Load needed functions

        Instance.Win32.LoadLibraryA = TGetProcAddr( Instance.Modules.Kernel32, 0xb7072fdb );



        // Load needed Libraries

        Instance.Modules.User32     = Instance.Win32.LoadLibraryA( GET_SYMBOL( "User32" ) );



        if ( Instance.Modules.User32 != NULL ) 

        {

            Instance.Win32.MessageBoxA = TGetProcAddr( Instance.Modules.User32, 0xb303ebb4 );

        } 

    }

    

    // ------ Code ------

    Instance.Win32.MessageBoxA( NULL, GET_SYMBOL( "Hello World" ), GET_SYMBOL( "MessageBox Title" ), MB_OK );

}

Btw as you can see we can use normal strings in our shellcode. This is because we include the .rdata section into our shellcode at linking time. And GET_SYMBOL gets the pointer to the function or string via its relative offset to GetRIP()

Install & Use

git clone https://github.com/Cracked5pider/ShellcodeTemplate.git

Next, you would need to change the project name in the makefile from ShellcodeTemplate to whatever you want Then you can compile the project by using make.