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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
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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

Using taskverse to see hidden processes


In the Linux kernel, there are a several ways to modify the kernel so that process hiding can work. Since this chapter is not meant to be an exegesis on all kernel rootkits, I will cover only the most commonly used method and then propose a way of detecting it, which is implemented in the taskverse program I made available in 2014.

In Linux, the process IDs are stored as directories within the /proc filesystem; each directory contains a plethora of information about the process. The /bin/ps program does a directory listing in /proc to see which pids are currently running on the system. A directory listing in Linux (such as with ps or ls) uses the sys_getdents64 system call and the filldir64 kernel function. Many kernel rootkits hijack one of these functions (depending on the kernel version) and then insert some code that skips over the directory entry containing the d_name of the hidden process. As a result, the /bin/ps program is unable to find the...

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