Use tool to execute shellcode in memory and redirect STDOUT to a stream which can be read by a C2 server.

./GenericLoader.exe <PATH TO B64 File>

1. Redirects STDOUT into stream.
2. Decodes bytes from Base64 string passed via cmd arguments
3. Executes bytes in memory
4. Returns STDOUT of executed program as a string.

Powershell OneLiner -

[System.Convert]::ToBase64String([System.IO.File]::ReadAllBytes(".\Path\To\sample.exe")) > sample.b64

C# Code

// Code Block to B64 encode contents of a exe. byte[] Filecont = System.IO.File.ReadAllBytes(args[0]); string B64Filecont = Convert.ToBase64String(Filecont,0,Filecont.Length);

1. https://github.com/malcomvetter/ManagedInjection