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How to block stealthy computer virus attacks

November 04, 2009 13:42 IST

Researchers from North Carolina State University have devised a novel way to block rootkits, one of the most insidious types of malware, preventing them from taking over computer systems.

Malware, or computer viruses, is a growing problem that can lead to crashed computer systems and stolen personal information.

A recent Internet security threat report showed a 1,000 per cent increase in the number of new malware signatures extracted from the in-the-wild malware programs found from 2006 to 2008.

Rootkits typically work by hijacking a number of 'hooks', or control data, in a computer's operating system.

"Hackers can use rootkits to install and hide spyware or other programs. When you start your machine, everything seems normal but, unfortunately, you've been compromised," said Dr Xuxian Jiang, assistant professor of computer science at NC State and a co-author of the research.

"By taking control of these hooks, the rootkit can intercept and manipulate the computer system's data at will essentially letting the user see only what it wants the user to see," Jiang added.

As a result, the rootkit can make itself invisible to the computer user and any antivirus software. Furthermore, the rootkit can install additional malware, such as programs designed to steal personal information, and make them invisible as well.

In order to prevent a rootkit from insinuating itself into an operating system, Jiang said that all of an operating system's hooks need to be protected.

"Our research leads to a new way that can protect all the hooks in an efficient way, by moving them to a centralized place and thus making them easier to manage and harder to subvert," said Jiang.

Jiang revealed that by placing all of the hooks in one place, researchers were able to simply leverage hardware-based memory protection, which is now commonplace, to prevent hooks from being hijacked.

They were able to put hardware in place to ensure that a rootkit cannot modify any hooks without approval from the user.

Source: ANI