Convert String to Shell Code Hex in Python

if you want
  //bin/sh
to become hex you can use in assembly for shell code

>>> for word in (re.findall(".{8}", binascii.hexlify("//bin/sh".encode()).decode())):
...  byte = re.findall(".{2}", word)
...  cmd = ""
...  for index in range(len(byte)-1,-1,-1):
...   cmd = cmd + byte[index]
...  print("push 0x%s" % cmd)
...

push 0x69622f2f
push 0x68732f6e


side notes
   binascii.hexlify converts string to binary
   re.findall(".{8}", finds the words
   re.findall(".{2}" , finds the bytes
   range(... ,... , -1) loops through the bytes in each word backwards (endianess)
   cmd = cmd + ...  rebuilds the hex in the correct order

Decode ShellCode String in Python

if you see this

push 0x68732f2f
push 0x6e69622f

it may be a string
you can use python 3 to decode and see

import binascii
>>> binascii.unhexlify("68732f2f").decode()[::-1]
'//sh'
>>> binascii.unhexlify("6e69622f").decode()[::-1]
'/bin'

yep! shellcode

//sh/bin



side note:
  binascii.hexlify was used to convert the hex to a binary

  decode() was used to convert the binary to a string

  [::-1] was used to reverse the string's characters