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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

Kprobe rootkits


This particular type of kernel rootkit was originally conceived and described in great detail in a 2010 Phrack paper that I wrote. The paper can be found at http://phrack.org/issues/67/6.html.

This type of kernel rootkit is one of the more exotic brands in that it uses the Linux kernels Kprobe debugging hooks to set breakpoints on the target kernel function that the rootkit is attempting to modify. This particular technique has its limitations, but it can be quite powerful and stealthy. However, just like any of the other techniques, if the analyst knows what to look for, then the kernel rootkits that use kprobes can be quite easy to detect.

Detecting kprobe rootkits

Detecting the presence of kprobes by analyzing memory is quite easy. When a regular kprobe is set, a breakpoint is placed on either the entry point of a function (see jprobes) or on an arbitrary instruction. This is extremely easy to detect by scanning the entire code segment looking for breakpoints, as there is...

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