def internal_decrypt()

in icedid/peloader/icedid_peloader.py [0:0]

• 12 lines of code
• 3 McCabe index (conditional complexity)

    def internal_decrypt(self, data: bytes, size: int, key: bytes) -> bytes:
        outList = []
        if size > 400:
            log.info("size of data: %d", size)
        for i in range(size):
            x = i & 3
            y = (i + 1) & 3

            c = key[y * 4] + key[x * 4]
            c = (c ^ data[i]) & 0xFF

            outList.append(c.to_bytes(1, byteorder="little"))

            key = self.fix_key(key, x * 4, y * 4)

        return b"".join(outList)