ShellCodeLoader

A small shellcode loader library written in C#.
This small library allows you to inject shellcode in memory of current launched file or any other processes using different techniques. Useful to use as red team or in a remote access tool. Works for 32 & 64 bit shellcode.

Note :

• has been tested on same process and notepad as target

I added some test payloads which I've converted with

• First with : Donut (https://github.com/TheWover/donut) : turns my payload into raw shellcode
• Second with HxD Editor (https://mh-nexus.de/en/downloads.php?product=HxD20) : gives me an array of raw bytes from payloads converted with Donut

How to use it ?

For same process:

ShellCodeLoader.ShellCodeLoader cpp = new ShellCodeLoader.ShellCodeLoader(PayloadCpp64.rawData);
cpp.LoadWithKernel32();//can be LoadWithNTDelegates , LoadWithKernel32Delegates or LoadWithNT
cpp.Dispose();

For other processes:

Process Target = Process.GetProcessesByName("notepad")[0];
ShellCodeLoader.ShellCodeLoaderEx cpp = new ShellCodeLoader.ShellCodeLoaderEx(Target, PayloadCpp64.rawData);
cpp.LoadWithKernel32();//or cpp.LoadWithNT();
cpp.Dispose();

MapView:

ShellCodeLoader.MapView cpp = new ShellCodeLoader.MapView(PayloadCpp64.rawData);
cpp.LoadWithNtMapView();
cpp.Dispose();

MapView with target:

ShellCodeLoader.MapView cpp = new ShellCodeLoader.MapView(Target, PayloadCpp64.rawData);
cpp.LoadWithNtMapView();
cpp.Dispose();

QueueAPC:

ShellCodeLoader.QueueAPC cpp = new ShellCodeLoader.QueueAPC(PayloadCpp64.rawData);
cpp.LoadWithQueueAPC();
cpp.Dispose();

Minimal API:

ShellCodeLoader.ShellCodeLoaderMinimalNativeAPI cpp = new ShellCodeLoader.ShellCodeLoaderMinimalNativeAPI(PayloadCpp64.rawData);
cpp.Asynchronous = true;//  false otherwise
cpp.LoadWithMinimalAPI();
cpp.Dispose();

Includes :

• Asynchronous (a simple Task.Run to not block main thread)
• Loading with Kernel32
• Loading with NtDll
• NtDll : NtAllocateVirtualMemory
• NtDll : NtWriteVirtualMemory
• NtDll : NtProtectVirtualMemory
• NtDll : NtFreeVirtualMemory
• NtDll : NtCreateThreadEx
• NtDll : NtCreateSection
• NtDll : NtMapViewOfSection
• NtDll : NtTestAlert
• Kernel32 : GetCurrentProcess
• Kernel32 : VirtualAlloc
• Kernel32 : VirtualAllocEx
• Kernel32 : VirtualFree
• Kernel32 : VirtualProtect
• Kernel32 : VirtualProtectEx
• Kernel32 : WriteProcessMemory
• Kernel32 : CreateRemoteThread
• Kernel32 : GetModuleHandle
• Kernel32 : GetProcAddress
• Kernel32 : QueueUserAPC
• Kernel32 : SleepEx
• Enumeration : PageProtection
• Enumeration : TypeAlloc
• Enumeration: FreeType
• Enumeration : SectionAccess
• Enumeration : MappingAttributes
• Delegates : all functions have been written with delegate style except GetModuleHandle and GetProcAddress

TODO :

• Inject shellcode in another process with VirtualEx and NtEx functions
• Check if shellcode is 64 or 32 bit before injection
• Check if dll (kernel32, ntdll) have been loaded

Known :

• Debugging 32 bit test injection involves PInvokeStackImbalance