DNS/索引/virustotalについて、ここに記述してください。
http://blog.virustotal.com/2013/04/virustotal-passive-dns-replication.html
Passive DNS replication is a technology which constructs zone replicas without cooperation from zone administrators, based on captured name server responses.
As explained by Merike Kaeo from the Internet Systems Consortium in this presentation, the main idea behind passive DNS is as follows:
- Inter-server DNS messages are captured by sensors and forwarded to a collection point for analysis.
- After being processed, individual DNS records are stored in a database where they can be indexed and queried.