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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

Obfuscation methods


A binary can be obfuscated or encrypted in many creative ways. Most binary protectors simply protect the entire binary with one or more layers of protection. At runtime, the binary is decrypted and can be dumped from the memory to acquire a copy of the unpacked binary. In more advanced protectors, such as Maya, every single function is encrypted individually, and allows only a single function to be decrypted at any given time.

Once a binary is encrypted, it must, of course, store the encryption keys somewhere. In the case of Maya (discussed earlier), a custom heap implementation that itself uses encryption to store encryption keys was designed. At some point, it would seem that a key has to be exposed (such as the key used to decrypt another key), but special techniques such as white-box cryptography can be used to make these final keys extremely obfuscated. If assistance from the kernel is used in a protector, then it is possible to store the key outside of the binary...

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