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phoreverpheebs / gibberish Public

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Hello, World! written in seemingly "gibberish" x86 assembly using
obfuscation on the assembly and machine code -level

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'Hello, World!' in x86 assembly, but make it gibberish The SIGSEGV

README.md

 'Hello, World!' in x86 assembly, but make it gibberish

gibberish is a simple 'Hello, World!' program written in x86
assembly, which doesn't reuse instructions and barely makes any
sense. We have branched off a version of gibberish, which defines the
'Hello, World!' string directly in the source and compiled binary
instead of scattering its bytes all over, before and during
execution. This branch also spends more time explaining the process
of its creation and techniques we can use to offset execution to keep
the program's doings secret. (The defined-string branch).

This repository is to demonstrate ways we can obfuscate a binary from
being read through a simple objdump or other disassembly tools.
Though, this method is not perfect, as simply tracking all call and
jmp instructions could lead to a reliable reconstruction of the
execution flow, we still may observe that running strings on this
binary does not show any signs of an encoded Hello, World! string,
since we use various methods to encode these in instructions, or
increment and decrement previous values to get the character we need.

We also demonstrate how certain actions may be performed in redundant
ways, so as to confuse the average reverse engineer (e.g. the print
procedure uses four total instructions to zero the eax register).

 The SIGSEGV

gibberish.asm (at least on my machine) runs into a segmentation fault
about 50% of the time, which to me raises an interesting question
that will lead me to look into how memory is laid out at the
beginning of a processes execution on a standard Linux system. In
gdb, the memory seems to be allocated in a consistent manner, which
causes the exception to never occur, though in normal execution it
seems to be slightly different.

About

Hello, World! written in seemingly "gibberish" x86 assembly using
obfuscation on the assembly and machine code -level

Resources

Readme

License

MIT license

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  * Makefile 5.5%

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