Get the Whitepaper called PE Injection Explained. Injecting code into other process memory is generally limited to shellcodes, either to hide the shellcode from Antivirus or to inject a DLL. The method described here is more powerful and enables you to inject and run a complete PE module inside another process’ memory, including the possibility to call any system or runtime API with plain C++. It relies only on documented features and C++, no assembly knowledge required.
You can download it from the following link: https://packetstormsecurity.com/files/download/126140/PE_Injection_Explained.pdf
Source: https://packetstormsecurity.com/files/126140/PE-Injection-Explained.html