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Thursday, February 08, 2007
Massive Hacker Attack Slows Internet

The worst attack in years on the Internet's infrastructure, which slowed traffic but failed to bring down the Web, used infected computers around the world as "zombies," security experts said.

The US Department of Homeland Security meanwhile confirmed that its cybersecurity arm had been monitoring "anomalous" activity on the Internet.

"The nature of the traffic has not been confirmed, and the servers which are overseas remain operational," DHS spokesman Russ Knocke said.

"There are no indications of any direct nexus to the United States at this time. Also, there is no credible intelligence to suggest an imminent threat to the homeland or our computing systems at this time."

Graham Cluley, senior technology consultant at the London-based firm Sophos, said Tuesday's incident "seems to have been the most serious attack against these domain name servers" since late 2002.

Cluley said three of the 13 domain name system (DNS) servers that control global Internet traffic were hit with a so-called "denial of service" attack, which means they were bombarded with information requests in an effort to bring them down.

Cluley noted that the attack was coming from PCs taken over by hackers to create zombie networks or "botnets" to bombard the servers with traffic.

"These zombie computers could have brought the Web to its knees, and while the resilience of the root servers should be commended, more needs to be done to tackle the root of the problem -- the lax attitude of some users towards IT security," he said.

He said that since the 2002 attacks, "the system has become more resilient and is well set up to bounce back from these attacks."

The US-based SANS Internet Storm Center said experts at the computer security institute were "aware of the attacks," and trying to get more information about them.

"We're still hunting for some technical details," said center director Marcus Sachs.

Cluley said some reports traced the attacks to South Korea, but added that "it doesn't mean the hackers are based there ... the bad guys could be based anywhere in the world."

"It could be that your grandmother's computer in the bedroom, unbeknownst to her, may have been trying to bring down the Internet."

The attack was on three of the 13 Internet root servers, which manage the domains from various locations around the world and convert website names such as to their numeric IP (Internet Protocol) address. "If the DNS servers were to fall over then pandemonium would ensue, emphasizing the importance of properly defending all PCs from being taken over by hackers," said Cluley.

In October 2002, another major attack targeted the 13 root servers and slowed traffic. But experts said at the time that the Internet would still operate with at least one of the servers functioning.

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