Shellcode

Pwntools can be used to generate shellcode. The following example generates x64 shellcode for Linux to execute sh.

from pwnlib import *

context.context(arch='amd64', os='linux')
shellcode = asm.asm(shellcraft.amd64.linux.sh())

Another tool to generate shellcode is msfvenom, which is a part of the Metasploit framework.

To generate shellcode just run the command msfvenom -p <payload>. To list all available payloads run msfvenom --list payloads.

For other options run msfvenom --help.