Hello reader, this primer aims at giving an insight into the inner details of a binary program. Currently, its only focus is on the native file format for Linux binaries, i.e. Executable and Linkable Format (shortly used as ELF). It may prove useful to security researchers or curiosity-driven individuals interested in below mentioned or domains similar to:
- Malware analysis
- Reverse engineering
- Binary Instrumentation
- Binary Exploitation
- Linkers & loaders
- Writing low level softwares (binary protectors/packers, bootloaders, operating systems etc.)
- Virus research x_x
A familiarity with the Linux environment and experince with some programming language(s) (not absolutely necessary though) would significantly help in having a greater understanding. There are parts of the course which may not make sense at first or may need cross referencing with official ELF specifications, so don't hesitate to open it up whenever the need calls. I am working on UBUNTU 18.04 (x86_64 bit) as my host machine (We'll be doing cross-compilation for x86_32 bit architecture whenever required).
All the files used in this primer are linked and can be downloaded to reproduce the results on your system. To follow up with the content you may need compiled binaries for which I suggest you to clone the repository on your local system by typing the bellow given commands.
critical@d3ad:~$ git clone https://github.com/compilepeace/BINARY_DISSECTION_COURSE
Cloning into 'BINARY_DISSECTION_COURSE'...
remote: Counting objects: 94, done.
remote: Compressing objects: 100% (56/56), done.
remote: Total 94 (delta 22), reused 82 (delta 13), pack-reused 0
Unpacking objects: 100% (94/94), done.If you want to build the binaries from the source code on your system then move to the directory whose binaries you want build for your system and in that directory (for eg: I am in BINARY_DISSECTION_COURSE/ELF/ELF_HEADER directory) , type the bellow given commands.
critical@d3ad:~/BINARY_DISSECTION_COURSE/ELF/ELF_HEADER$ make clean
rm hello_32 hello_64
critical@d3ad:~/Desktop/BINARY_DISSECTION_COURSE/ELF/ELF_HEADER$ make
gcc -m32 -no-pie hello.c -o hello_32
gcc -no-pie hello.c -o hello_64 I am open to suggestions and corrections. Also, you may like to watch the repository for updates before forking. Please feel free to open up any issues or reach me out via email :)
NAME : ABHINAV THAKUR
EMAIL: [email protected]