https://blog.faceutil.com/2020/07/02/dos-%ea%b3%a0%ec%8a%a4%ed%8a%b8ghost-%ec%9e%90%eb%8f%99%ed%99%94%eb%b3%b5%ea%b5%ac%ec%8b%9c%ec%8a%a4%ed%85%9c-%e3%82%b2/