Unicode Characters in Shellcode Cause Exception

[adamdoupe]

break.asm
.section .text
xor %eax,%eax /* ☃ */
push %eax
push $0x68732f2f
push $0x6e69622f
mov %esp,%ebx
push %eax
push %ebx
mov %esp,%ecx
mov $0xb,%al
int $0x80
-- end break.asm --

python shellnoob.py --from-asm break.asm --to-exe break

causes the following exception:

Traceback (most recent call last):
File "shellnoob.py", line 1557, in
main()
File "shellnoob.py", line 1553, in main
snoob.do_conversion(input_fp, output_fp, input_fmt, output_fmt)
File "shellnoob.py", line 515, in do_conversion
_output = getattr(self, conv_func_name)(_input)
File "shellnoob.py", line 221, in conv
_hex = to_hex(self, input_s, with_breakpoint)
File "shellnoob.py", line 665, in asm_to_hex
obj = self.asm_to_obj(asm, with_breakpoint)
File "shellnoob.py", line 960, in asm_to_obj
tmp_asm_f.write(asm.encode("utf-8"))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 36: ordinal not in range(128)

@reyammer

[kapravel]

☃☃☃☃☃☃☃☃☃☃☃

[reyammer]

@kapravel, thanks for your valuable contribution. Now the problem is much clearer. :P