DDoS represent Denial of Service in Distributed system and presents a serious threat into the Internet, when it incepts. In Distributed Reflection DoS (DRDoS), attackers may try to make fool innocent servers while flushing massive packets to victim. But most of current DRDoS detection mechanisms are available which contain own protocol and doesn't work on other than specific protocol. In DDoS attacks, it is found that because of attacking flow and normal flow from server has relation between different packets. While taking this consideration, the rank correlation detection algorithm is comes under the picture.