An interesting clip from msn news page.

"The emergence of a related e-mail virus on Monday called Netsky.AC may hold clues to the authorship of Sasser. Netsky.AC carries an attachment purporting to fix Sasser infections.

Since spotting Netsky.AC, security officials suspect Sasser was programmed by a group believed to be based in Russia calling itself the "Skynet anti-virus group". A link on Microsoft's home page instructs users to make sure that they have installed a protective firewall, and update Windows to close the security loophole."