In this chapter, we covered coding for Metasploit. We worked on modules, post-exploitation scripts, meterpreter, RailGun, and Ruby programming too. Throughout this chapter, we saw how we can add our custom functions to the Metasploit framework and make the already powerful framework much more powerful. We began with familiarizing ourselves with the basics of Ruby. We learned about writing auxiliary modules, post-exploitation scripts, and meterpreter extensions. We saw how we could make use of RailGun to add custom functions such as adding a DLL file and a custom function to the target's DLL files.

In the next chapter, we will look at the development in context to exploit the modules in Metasploit. This is where we will begin to write custom exploits, fuzz various parameters for exploitation, exploit software, and write advanced exploits for software and the Web.