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You're reading from  Learning Linux Binary Analysis

Product typeBook
Published inFeb 2016
Reading LevelIntermediate
PublisherPackt
ISBN-139781782167105
Edition1st Edition
Languages
C
Tools
Linux
Concepts
Data Analysis
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Author (1)
Ryan "elfmaster" O'Neill
Ryan "elfmaster" O'Neill
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Ryan "elfmaster" O'Neill

Ryan "elfmaster" O'Neill is a computer security researcher and software engineer with a background in reverse engineering, software exploitation, security defense, and forensics technologies. He grew up in the computer hacker subculture, the world of EFnet, BBS systems, and remote buffer overflows on systems with an executable stack. He was introduced to system security, exploitation, and virus writing at a young age. His great passion for computer hacking has evolved into a love for software development and professional security research. Ryan has spoken at various computer security conferences, including DEFCON and RuxCon, and also conducts a 2-day ELF binary hacking workshop. He has an extremely fulfilling career and has worked at great companies such as Pikewerks, Leviathan Security Group, and more recently Backtrace as a software engineer. Ryan has not published any other books, but he is well known for some of his papers published in online journals such as Phrack and VXHeaven. Many of his other publications can be found on his website at http://www.bitlackeys.org.
Read more about Ryan "elfmaster" O'Neill

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The PT_NOTE to PT_LOAD conversion infection method

This method is extremely powerful and, although easily detectable, is also relatively easy to implement and provides reliable code insertion. The idea is to convert the PT_NOTE segment to the PT_LOAD type and move its position to go after all of the other segments. Of course, you could also just create an entirely new segment by creating a PT_LOAD phdr entry, but since a program will still execute without a PT_NOTE segment, you might as well convert it to PT_LOAD. I have not personally implemented this technique for a virus, but I have designed a feature in Quenya v0.1 that allows you to add a new segment. I also did an analysis of the Retaliation Linux virus authored by Jpanic, which uses this method for infection:

http://www.bitlackeys.org/#retaliation.

Figure 4.5: PT_LOAD infection

There are no strict rules about the PT_LOAD infection. As mentioned here, you may convert PT_NOTE into PT_LOAD or create an entirely new PT_LOAD phdr and segment...

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Learning Linux Binary Analysis
Published in: Feb 2016Publisher: PacktISBN-13: 9781782167105
© 2016 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Ryan "elfmaster" O'Neill

Ryan "elfmaster" O'Neill is a computer security researcher and software engineer with a background in reverse engineering, software exploitation, security defense, and forensics technologies. He grew up in the computer hacker subculture, the world of EFnet, BBS systems, and remote buffer overflows on systems with an executable stack. He was introduced to system security, exploitation, and virus writing at a young age. His great passion for computer hacking has evolved into a love for software development and professional security research. Ryan has spoken at various computer security conferences, including DEFCON and RuxCon, and also conducts a 2-day ELF binary hacking workshop. He has an extremely fulfilling career and has worked at great companies such as Pikewerks, Leviathan Security Group, and more recently Backtrace as a software engineer. Ryan has not published any other books, but he is well known for some of his papers published in online journals such as Phrack and VXHeaven. Many of his other publications can be found on his website at http://www.bitlackeys.org.
Read more about Ryan "elfmaster" O'Neill

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