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killswitch-GUIkillswitch-GUI
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‎.gitignore‎

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*.obj
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*.elf
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*.DS_Store
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*.sc
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# Precompiled Headers
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*.gch
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*.pch

‎Makefile‎

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default: system-execve-shell
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system-execve-shell.o: shellcode/system-execve-shell.c
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gcc-6 -c shellcode/system-execve-shell.c -o shellcode/system-execve-shell.o --shared -fpic -static -O0 -fno-asynchronous-unwind-tables -D LIB
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system-execve-shell: shellcode/system-execve-shell.o
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ld shellcode/system-execve-shell.o -o shellcode/system-execve-shell -S -static -dylib -order_file shellcode/system-execve-order-file.txt
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system-execve-shell: shellcode/system-execve-shell
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gobjcopy -O binary --only-section=.text shellcode/system-execve-shell shellcode/system-execve-shell.sc
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clean:
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-rm -f shellcode/system-execve-shell.o
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-rm -f shellcode/system-execve-shell

‎README.md‎

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A small setup that I used to learn X86_x64 shellcode generation using ASM and compiled C code.
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## OSX Setup
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## OSX Host Setup
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Please ensure you have the following installed before starting to build.
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- Install XCode: `xcode-select --install`
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- Install Brew: `/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"`
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- Install Brew GCC: `brew install gcc`
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- Install Brew GCC: `brew install gcc`
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- Link GCC 6: `ln -s /usr/local/Cellar/gcc/6.3.0_1/bin/gcc-6 gcc-6`
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## Shellcode generation
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In this project we have a few diffrent types of shell code that I have built as POC using C and ASM.
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### System Execve /bin/sh
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This code uses inline ASM in C for system call and executes a /bin/sh as an example.

‎build.sh‎

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#!/bin/bash
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echo "- Starting to build Shellcode: system-execve-shell "
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gcc-6 -c shellcode/system-execve-shell.c -o shellcode/system-execve-shell.o --shared -fpic -static -O0 -fno-asynchronous-unwind-tables -D LIB
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echo "- Starting to link Shellcode: system-execve-shell "
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ld shellcode/system-execve-shell.o -o shellcode/system-execve-shell -S -static -dylib -order_file shellcode/system-execve-order-file.txt
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echo "- Starting to export Shellcode: system-execve-shell "
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gobjcopy -O binary --only-section=.text shellcode/system-execve-shell shellcode/system-execve-shell.sc
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echo "- Clean Up from build"
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rm -f shellcode/system-execve-shell.o
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rm -f shellcode/system-execve-shell

‎shellcode/system-execve-order-file.txt‎

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_main1

‎shellcode/system-execve-shell.c‎

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/usr/local/Cellar/gcc/6.3.0_1/bin/gcc-6 -c test.c --shared -fpic -static -O3 -fno-asynchronous-unwind-tables -D LIB
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2) link your code:
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ld test.o -o test -S -static -dylib -order_file order_file.txt
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ld test.o -o test -S -static -dylib -order_file system-execve-order-file.txt
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2) get hex of shel code of section:
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gobjcopy -O binary --only-section=.text test test.output

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