Python Tool / library, shellcode_encoder is a SUB shellcode encoder that uses z3 to find the right valid instructions.

pip install -r requirements.txt

Use the function code_shellcode.

offset_r_address: the offset from the start register(example esp) to the address of the shellcode. For the encoder to work, it must know the address of it's location. To do so, we can use for example esp as a reference and calculate the difference between where esp points to and the address of the input.

register: the starting register(default: ESP)

bad_chars: a list of bad chars

shellcode: the shellcode to encode

scripting: Should be set to True

Example:

encoded_shellcode = encode_shellcode(offset_r_address=0xc7f, register='esp', bad_chars=[], shellcode="\x41\x42\x43\x44", scripting=True)