br 90 of unknown malware is delivered via the web br A new study of malware takes an unusual approach – instead of analyzing known malware, it analyzes the unknown malware that traditional defenses miss; and finds that 90 is delivered from the web rather than via emails. br The study, The modern malware review, was undertaken by Palo Alto Networks drawing on data from more than 1000 enterprise customers that use its WildFire firewall option. Wildfire analyzes unknown files; that is, files that are neither whitelisted nor blacklisted. It is the unknown files that turned out to be unknown malware that have been analyzed: some 26,000 samples over a period of 3 months.