Sign In Start Free Trial
Account

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Learning Linux Binary Analysis
  • Table Of Contents Toc
  • Feedback & Rating feedback
Learning Linux Binary Analysis

Learning Linux Binary Analysis

By : "elfmaster" O'Neill
4.8 (10)
close
close
Learning Linux Binary Analysis

Learning Linux Binary Analysis

4.8 (10)
By: "elfmaster" O'Neill

Overview of this book

Learning Linux Binary Analysis is packed with knowledge and code that will teach you the inner workings of the ELF format, and the methods used by hackers and security analysts for virus analysis, binary patching, software protection and more. This book will start by taking you through UNIX/Linux object utilities, and will move on to teaching you all about the ELF specimen. You will learn about process tracing, and will explore the different types of Linux and UNIX viruses, and how you can make use of ELF Virus Technology to deal with them. The latter half of the book discusses the usage of Kprobe instrumentation for kernel hacking, code patching, and debugging. You will discover how to detect and disinfect kernel-mode rootkits, and move on to analyze static code. Finally, you will be walked through complex userspace memory infection analysis. This book will lead you into territory that is uncharted even by some experts; right into the world of the computer hacker.
Table of Contents (11 chapters)
close
close
10
Index

Identifying text segment padding infections


This type of infection is relatively easy to detect. This type of infection was also discussed in Chapter 4, ELF Virus Technology – Linux/Unix Viruses. This technique relies on the fact that there is always going to be a minimum of 4,096 bytes between the text and the data segment because they are loaded into memory as two separate memory segments, and memory mappings are always page aligned.

On 64-bit systems, there is typically 0x200000 (2MB) free due to PSE (Page size extension) pages. This means that a 64-bit ELF binary can be inserted with a 2MB parasite, which is much larger than what is typically needed for an injection space. With this type of infection, like any other, you can often identify the parasite location by examining the control flow.

With the lpv virus which I wrote in 2008, for instance, the entry point is modified to start execution at the parasite that is inserted using the text segment padding infection. If the executable...

Unlock full access

Continue reading for free

A Packt free trial gives you instant online access to our library of over 7000 practical eBooks and videos, constantly updated with the latest in tech

Create a Note

Modal Close icon
You need to login to use this feature.
notes
bookmark search playlist download font-size

Change the font size

margin-width

Change margin width

day-mode

Change background colour

Close icon Search
Country selected

Close icon Your notes and bookmarks

Delete Bookmark

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Delete Note

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Edit Note

Modal Close icon
Write a note (max 255 characters)
Cancel
Update Note

Confirmation

Modal Close icon
claim successful

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY