x86 Assembly Language Shellcoding Linux

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Course Description

This course focuses on teaching the basics of 64-bit assembly language for the x86_64 family of processors on the Linux platform and applying it to Infosec. Once we are through with the basics, we will look at writing shellcode, encoders, decoders, crypters and other advanced low level applications.

The course outline follows the exact same outline of our 32-bit course but all the topics will be taught with x86_64 64-bit assembly.
A non-exhaustive list of topics to be covered include:



Computer Architecture Basics
x86/x86_64 Family
Compilers, Assemblers and Linkers
CPU Modes and Memory Addressing
Tools of the trade
Nasm, Ld, Objdump, Ndisasm etc.

x86_64 Assembly Language
Registers and Flags
Program Structure for use with nasm
Data Types
Data Movement Instructions
Arithmetic instructions
Reading and Writing from memory
Conditional instructions
Strings and Loops
Interrupts, Traps and Exceptions
Procedures, Prologues and Epilogues
Syscall structure and ABI for Linux
Calling standard library functions
FPU instructions
MMX, SSE, SSE2 etc. instruction sets

Shellcoding on Linux
Execution environment
Exit and Execve shellcode
Bind Shell and Reverse TCP
Staged Shellcode
Egg Hunter
Using 3rd party shellcode
Simulating shellcode
locating syscalls
graphing shellcode execution

Encoders, Decoders and Crypters on Linux
Purpose of encoding and crypting
XOR encoders
Custom encoding
Random sequencing and scrambling
mapping functions

Crypters

Polymorphism
Why polymorphism?
Polymorphic engines
Techniques and Tools

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