Developing custom modules

Let us dig deep into the process of writing a module. Metasploit has various modules such as payloads, encoders, exploits, NOP generators, and auxiliaries. In this section, we will cover the essentials of developing a module; then, we will look at how we can actually create our own custom modules.

In this section, we will discuss development for auxiliary and post-exploitation modules. Additionally, we will cover core exploit modules in the next chapter. Coming back to this chapter, let us discuss the essentials of module building in detail.

Building a module in a nutshell

Let us understand how things are arranged in the Metasploit framework, as well as all the components of Metasploit and what they do.

The architecture of the Metasploit framework

Metasploit comprises various components such as important libraries, modules, plugins, and tools. A diagrammatic view of the structure of Metasploit is as follows:

Let's see what these components are and how they work...