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Learning Linux Binary Analysis

Learning Linux Binary Analysis

By : "elfmaster" O'Neill
4.8 (10)
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Learning Linux Binary Analysis

Learning Linux Binary Analysis

4.8 (10)
By: "elfmaster" O'Neill

Overview of this book

Learning Linux Binary Analysis is packed with knowledge and code that will teach you the inner workings of the ELF format, and the methods used by hackers and security analysts for virus analysis, binary patching, software protection and more. This book will start by taking you through UNIX/Linux object utilities, and will move on to teaching you all about the ELF specimen. You will learn about process tracing, and will explore the different types of Linux and UNIX viruses, and how you can make use of ELF Virus Technology to deal with them. The latter half of the book discusses the usage of Kprobe instrumentation for kernel hacking, code patching, and debugging. You will discover how to detect and disinfect kernel-mode rootkits, and move on to analyze static code. Finally, you will be walked through complex userspace memory infection analysis. This book will lead you into territory that is uncharted even by some experts; right into the world of the computer hacker.
Table of Contents (11 chapters)
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10
Index

Detecting the ET_DYN injection


I think that the most prevalent type of process infection is DLL injection, also known as .so injection. It is a clean and effective solution that suits the needs of most attackers and runtime malware. Let's take a look at an infected process, and I will highlight the ways in which we can identify parasite code.

Note

The terms shared object, shared library, DLL, and ET_DYN are all used synonymously throughout this book, especially in this particular section.

Azazel userland rootkit detection

Our infected process is a simple test program named ./host that is infected with the Azazel userland rootkit. Azazel is the newer version of the popular Jynx rootkit. Both of these rootkits rely on LD_PRELOAD to load a malicious shared library that hijacks various glibc shared library functions. We will inspect the infected process using various GNU tools and the Linux environment, such as the /proc filesystem.

Mapping out the process address space

The first step while analyzing...

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