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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

Existing ELF binary protectors


Over the years, there have been a few noteworthy binary protectors that were released both publicly and from the underground scene. I will discuss some of the protectors for Linux and give a synopsis of the various features.

DacryFile by the Grugq – 2001

DacryFile is the earliest binary protector that I am aware of for Linux (https://github.com/packz/binary-encryption/tree/master/binary-encryption/dacryfile). This protector is simple but nonetheless clever and works very similarly to ELF parasite infection from a virus. In many protectors, the stub wraps around the encrypted binary, but in the case of DacryFile, the stub is just a simple decryption routine that is injected into the binary that is to be protected.

DacryFile encrypts a binary from the beginning of the .text section to the end of the text segment using RC4 encryption. The decryption stub is a simple program written in asm and C, and it does not have the userland exec functionality; it simply decrypts...

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