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Mastering Metasploit
Mastering Metasploit

Mastering Metasploit: With this tutorial you can improve your Metasploit skills and learn to put your network's defenses to the ultimate test. The step-by-step approach teaches you the techniques and languages needed to become an expert.

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Mastering Metasploit

Chapter 2. Reinventing Metasploit

After recalling the basics of Metasploit, we can now move further into the basic coding part of Metasploit. We will start with the basics of Ruby programming and understand the various syntaxes and semantics of it. This chapter will make it easy for you to write Metasploit modules. In this chapter, we will see how we can design and fabricate various custom Metasploit modules. We will also see how we can create custom post-exploitation modules, which will help us gain better control of the exploited machine.

Consider a scenario where the systems under the scope of the penetration test are very large in number, and we need to perform a post-exploitation function such as downloading a particular file from all the systems after exploiting them. Downloading a particular file from each system manually will consume a lot of time and will be tiring as well. Therefore, in a scenario like this, we can create a custom post-exploitation script that will automatically...

Ruby – the heart of Metasploit


Ruby is indeed the heart of the Metasploit framework. However, what exactly is Ruby? According to the official website, Ruby is a simple and powerful programming language. Yokihiru Matsumoto designed it in 1995. It is further defined as a dynamic, reflective, and general-purpose object-oriented programming language with functions similar to Perl.

Note

You can download Ruby for Windows/Linux from http://rubyinstaller.org/downloads/.

You can refer to an excellent resource for learning Ruby practically at http://tryruby.org/levels/1/challenges/0.

Creating your first Ruby program

Ruby is an easy-to-learn programming language. Now, let's start with the basics of Ruby. However, remember that Ruby is a vast programming language. Covering all the capabilities of Ruby will push us beyond the scope of this book. Therefore, we will only stick to the essentials that are required in designing Metasploit modules.

Interacting with the Ruby shell

Ruby offers an interactive shell...

Developing custom modules


Let's dig deep into the process of writing a module. Metasploit has various modules such as payloads, encoders, exploits, NOPs, 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 auxiliary and post-exploitation modules. However, we will discuss exploit modules in detail in the next chapter as they are dedicated to building exploits. Coming back to this chapter, let's discuss the essentials of building a module first.

Building a module in a nutshell

Let's understand how things are arranged in the Metasploit framework as well as what all the components of Metasploit are and what they are meant to do.

The architecture of the Metasploit framework

Metasploit is composed of various components. These components include all the important libraries, modules, plugins, and tools. A diagrammatic view of the structure of Metasploit is as follows...

Breakthrough meterpreter scripting


The meterpreter shell is the deadliest thing that a victim can hear if an attacker compromises their system. Meterpreter gives the attacker a much wider approach to perform a variety of tasks on the compromised system. In addition to this, meterpreter has many built-in scripts, which makes it easier for an attacker to attack the system. These scripts perform simple and tedious tasks on the compromised system. In this section, we will look at those scripts, what they are made of, and how we can leverage a script in meterpreter.

Essentials of meterpreter scripting

As far as we have seen, we have used meterpreter in situations where we needed to perform some additional tasks on the system. However, now we will look at some of the advanced situations that may arise during a penetration test, where...

Working with RailGun


RailGun sounds like a gun set on rails; however, this is not the case. It is much more powerful than that. RailGun allows you to make calls to a Windows API without the need to compile your own DLL.

It supports numerous Windows DLL files and eases the way for us to perform system-level tasks on the victim machine. Let's see how we can perform various tasks using RailGun and perform some advanced post-exploitation with it.

Interactive Ruby shell basics

RailGun requires the irb shell to be loaded into meterpreter. Let's look at how we can jump to the irb shell from meterpreter:

We can see in the preceding screenshot that simply typing in irb from meterpreter drops us into the Ruby-interactive shell. We can perform a variety of tasks with the Ruby shell and can execute any Linux command from here.

Understanding RailGun and its scripting

RailGun gives us immense power to perform tasks that Metasploit can not perform. We can raise exceptions to any DLL file from the breached system...

Summary


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.

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Publication date : May 26, 2014
Length: 378 pages
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Table of Contents

10 Chapters
Approaching a Penetration Test Using Metasploit Chevron down icon Chevron up icon
Reinventing Metasploit Chevron down icon Chevron up icon
The Exploit Formulation Process Chevron down icon Chevron up icon
Porting Exploits Chevron down icon Chevron up icon
Offstage Access to Testing Services Chevron down icon Chevron up icon
Virtual Test Grounds and Staging Chevron down icon Chevron up icon
Sophisticated Client-side Attacks Chevron down icon Chevron up icon
The Social Engineering Toolkit Chevron down icon Chevron up icon
Speeding Up Penetration Testing Chevron down icon Chevron up icon
Visualizing with Armitage Chevron down icon Chevron up icon

Customer reviews

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Full star icon Full star icon Full star icon Full star icon Half star icon 4.7
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5 star 80%
4 star 13.3%
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2 star 6.7%
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Bob H. Aug 13, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Just finished reading through the book, It's a great reference. Almost makes Metasploit easy. I highly recommend this book for the beginner to upper moderate experienced penetration tester. The chapter on the Social Engineering Toolkit was especially helpful.
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Massera Riccardo Jul 14, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I really enjoyed reading this book, it is very well organized and the chapters follow a logical scheme, clearly stating the objectives at the beginning.After an introductory part, which describes in general how a penetration Testing should be conducted to adhere to the standard and achieve objective results, the book starts introducing you to Metasploit internals and focuses on the framework and what it offers to you to build your own tests and exploits.It is not just a mere description of how Metasploit works, the aim of the author is to help you understand how to work with the software and how you can leverage what it offers in order to get full advantage of what it can do.This objective is achieved explaining every aspect with an example and with some screenshot that help you understand what is going on with a step by step approach : this makes this book ideal also for teaching advanced techniques to a class of students.The central part of the book then focuses on various techniques to test a rich set of systems ranging fom Scada, to Windows, to web and Database servers.Other interesting arguments covered are the advanced client-side attacks and the social engineering toolkit.Finally, the last part of the book gives you many tips to enhance your working environment to speed up the tests and teaches you how you can work even more easily with Armitage, taking advantage of its scripting language Cortana.To sum up, this is really a must have book if you want to learn a professional approach to penetration testing, to become very proficient using Metasploit and other useful tools used to perform and explain various attack techniques and find useful hints and tips on how to plan and perform penetration testing in various scenarios in a quick and effective manner.
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Dr.$am Oct 09, 2014
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Good
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Zeeshan Sultan Oct 25, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Nipun Have Done Some Awesome Piece Of Writings In The Field Of Infosec And He Succeeded In Making A Noob To Expert Wiki With All That Quality Content i'd Just Say Time and Money i've spent on it is worth it totally repaid
Amazon Verified review Amazon
Abraham Rhode Aug 03, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
As an Information Security professional that routinely uses Metasploit while doing professional interactions, I was expecting to find that this book covered the basics of the framework and tossed in a few tips-and-tricks to keep the more advanced readers interested. After reading the entire book, and a few sections multiple times now, I have found this book to be an indispensable wealth of information. The topics are well organized and go into great detail, while providing the ground-work that will allow a non-veteran to gain a deep and thorough understanding of the framework and the way it operates and interacts.I openly reccommend this book to any Information Security professional looking to strengthen their understanding and use of Metasploit. I further recommend this book for the novice who needs to get up-to-speed quickly in the field, as it is a deep treasure of information that should not be overlooked.
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