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Learning Linux Binary Analysis

You're reading from   Learning Linux Binary Analysis Learning Linux Binary Analysis

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Product type Paperback
Published in Feb 2016
Publisher Packt
ISBN-13 9781782167105
Length 282 pages
Edition 1st Edition
Languages
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Author (1):
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Ryan "elfmaster" O'Neill Ryan "elfmaster" O'Neill
Author Profile Icon Ryan "elfmaster" O'Neill
Ryan "elfmaster" O'Neill
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Table of Contents (11) Chapters Close

Preface 1. The Linux Environment and Its Tools FREE CHAPTER 2. The ELF Binary Format 3. Linux Process Tracing 4. ELF Virus Technology – Linux/Unix Viruses 5. Linux Binary Protection 6. ELF Binary Forensics in Linux 7. Process Memory Forensics 8. ECFS – Extended Core File Snapshot Technology 9. Linux /proc/kcore Analysis 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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