https://packetstormsecurity.com/files/151731/macOS-TCP-4444-Bind-Shell-Null-Free-Shellcode.html

nasm -f macho64 -o ipv4bind.o ipv4bind.s && ld -macosx_version_min 10.7.0 -o ipv4bind ipv4bind.o

gcc -o loader loader.c

netstat -anvp tcp | awk 'NR<3 || /LISTEN/'

nc -v 0.0.0.0 4444