Diversity for Security: A Study with Off-the-Shelf AntiVirus Engines

We have previously reported [1] the results of an exploratory analysis of the potential gains in detection capability from using diverse AntiVirus products. The analysis was based on 1599 malware samples collected from a distributed honey pot deployment over a period of 178 days. The malware samples were sent to the signature engines of 32 different AntiVirus products hosted by the Virus Total service. The analysis suggested significant gains in detection capability from using more than one AntiVirus product in a one-out-of-two intrusion-tolerant setup. In this paper we present new analysis of this dataset to explore the detection gains that can be achieved from using more diversity (i.e. more than two AntiVirus products), how diversity may help to reduce the "at risk time" of a system and a preliminary model-fitting using the hyper-exponential distribution.