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 Tuesday, July 24, 2007

A growing, sophisticated technique of propagating cyber-crime, dubbed as fast-flux service networks, has increasingly been elevating the threats we face today on the Internet. "Fast-flux service networks are a network of compromised computer systems with public DNS records that are constantly changing, in some cases every few minutes. These constantly changing architectures make it much more difficult to track down criminal activities and shut down their operations." Despite the awareness of researchers and ISPs of fast-flux for over a year now, all of the current researches on fast-flux is new.

According to the Honeynet Project & Research Alliance, criminal organizations behind two infamous malware families, Warezov/Stration and Storm, have recently adopted this so-called fast-flux service networks into their infrastructures. "The purpose of this technique is to render the IP-based block list, a popular tool for identifying malicious systems, useless for preventing attacks," says Adam O'Donnell, director of emerging technologies at security vendor Cloudmark.

To fight against fast-flux, "ISPs and users should probe suspicious nodes and use intrusion detection systems; block TCP port 80 and UDP port 53; block access to mother ship and other controller machines when detected; 'blackhole' DNS and BGP route-injection; and monitor DNS."

Access the full article at the Dark Reading website.

Read more about fast flux service networks on the the Honeynet Project & Research Alliance's new report on the emerging networks and techniques.