as seen in 96baba74a907890b995f23c7db21568f7bfb5dbf417ed90ca311482b99702b72

tofsee_string_decrpyt.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import binascii


def decrypt(buf: bytes, key: int, summand: int) -> str:
    ret = bytearray()
    for i, c in enumerate(buf):
        ret.append(c ^ key)
        key += (-1 if i % 2 else 1) + summand
        key &= 0xff
    return ret.decode('utf-8').rstrip('\0')


if __name__ == '__main__':
    assert decrypt(binascii.unhexlify(b'8797286a6da3f032539eb4'), 0xe4, -0x38) == r'c:\Windows'