Johannes Ullrich is the director of the SANS Internet Storm Center (ISC)2 and a senior instructor for SANS. DShield collects firewall logs from contributors to get a handle on threats and trends in attacks. He says the Linksys home router worm infection this year was a big one for the ISC. The ISC serves as a sort of pulse of the security of the Internet, tracking new threats, attacks, and events. He heads a virtual team of 30 volunteer “handlers” who take turns manning the operation around the clock.”]