McAfee Avert Labs

Move over, Brad Pitt. Actress Jessica Biel has officially overtaken you as the most dangerous celebrity to search for in cyberspace, according to Internet security company McAfee. McAfee's third annual research report into Hollywood stars and pop culture's favored people offers insights into the riskiest celebrities on the Web.

A week ahead of Earth Day, McAfee is offering insights into spam's impact on the environment. McAfee's research reveals that spam is not only a nuisance that hinders business productivity, it also damages the environment and contributes to greenhouse gas emissions.

A new virus is spreading through Facebook. The Koobface -- a worm designed specifically to spread over social-networking sites -- is blasting spam messages out to Facebook members. The motive is to enable hijacking and click fraud.

Researchers have released software that exploits the recently leaked flaw in the Internet's Domain Name System (DNS) software. That may mean IT admins are in for a long weekend of implementing and testing the patch.

IOActive researcher Dan Kaminsky discovered the bug earlier this month. The attack code was released Wednesday by developers of the Metasploit hacking toolkit, headed by the infamous HD Moore.