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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

Identifying parasite code characteristics


We just reviewed some common methods for hijacking execution flow. If you can identify where the execution flow points, you can typically identify some or all of the parasite code. In the section Detecting PLT/GOT hooks, we determined the location of the parasite code for the hijacked puts() function by simply locating the PLT/GOT entry that had been modified and seeing where that address pointed to, which, in that case, was to an appended page containing parasite code.

Parasite code can be qualified as code that is unnaturally inserted into the binary; in other words, it wasn't linked in by the actual ELF object linker. With that said, there are several characteristics that can sometimes be attributed to injected code, depending on the techniques used.

Position independent code (PIC) is often used for parasites so that it can be injected into any point of a binary or memory and still execute properly regardless of its position in memory. PIC parasites...

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