Euclidian- and Cosine-Distances based Detection of Distributed Host Search Attacks

摘要

We statistically investigated the total PTR resource record (RR) based DNS query request packet traffic from the Internet to the top domain DNS server in a university campus network through January 1st to December 31st, 2011. The obtained results are: (1) We found twelve host search (HS) attacks in the scores for detection method using the calculated Euclidean distances between the observed IP address and the last observed IP address in the DNS query keywords by employing both threshold ranges of 1.0-2.0 (consecutive) and 150.2-210.4 (random). However, we found nineteen HS attacks in the scores using the calculated cosine distance between the DNS query IP addresses (threshold ranges of 0.75-0.83 and 0.9-1.0). (3) In the newly found HS attacks, we observed that the source IP addresses of the HS attack DNS query packets are distributed Therefore, it can be concluded that the cosine distance based detection technology can detect the source IP address-distributed host search attack.