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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

Checking the dynamic segment for DLL injection traces


Recall from Chapter 2, The ELF Binary Format, that the dynamic segment can be found in the program header table and is of type PT_DYNAMIC. There is also a .dynamic section that also points to the dynamic segment.

The dynamic segment is an array of ElfN_Dyn structs that contains d_tag and a corresponding value that exists in a union:

     typedef struct {
               ElfN_Sxword    d_tag;
               union {
                   ElfN_Xword d_val;
                   ElfN_Addr  d_ptr;
               } d_un;
           } ElfN_Dyn;

Using readelf we can easily view the dynamic segment of a file.

Following is an example of a legitimate dynamic segment:

$ readelf -d ./test

Dynamic section at offset 0xe28 contains 24 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x000000000000000c (INIT)               0x4004c8
 0x000000000000000d (FINI)               0x400754...
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