Computer Crime Research Center


Internet Attack Targets DoubleClick

Date: July 29, 2004
Source: ITNews Australia
By: Brian Krebs

The DoubleClick outage was caused by a distributed denial-of-service attack, in which hackers use the firepower of thousands of hijacked computers to flood a Web site with so many bogus Web page requests that it renders the site unavailable to legitimate users.

DoubleClick, the company that provides online advertising services for some of the nation's most popular Web sites, was the target of a sophisticated attack today, the third time in two months that hackers have targeted a major player in the commercial Internet.

Beginning at roughly 10:30 a.m. ET, unknown attackers overwhelmed DoubleClick's Internet servers with a flood of bogus Web page requests, blocking many major sites from loading ad images on their sites.

The attack made it difficult for Internet users to load pages at nearly all of the 40 most-visited Web sites. At the height of the assault, affected Web pages were available less than 25 percent of the time, according to Keynote Systems Inc., a Web performance monitoring company in San Mateo, Calif.
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