Kaspersky Lab has detected two cyber attacks targeting the users of MySpace and Facebook. As part of their malicious payload, the worms transform the victim machines into zombie computers to form botnets. The two variants of the new worm, Networm.Win32.Koobface.a. and Networm.Win32.Koobface.b, attack MySpace and Facebook respectively.
Even though the worms are currently only infecting MySpace and Facebook users, Kaspersky Lab analysts are warning users that the worms are designed to upload additional malicious modules with other functionality via the Internet. It is highly probable that victims machines will not only be used for spreading links via these social networking sites, but the botnets will also be used for other malicious purposes.
Net-Worm.Win32.Koobface.a spreads when a user accesses his/her MySpace account. The worm creates a range of commentaries to friends' accounts. Net-Worm.Win32.Koobface.b, which targets Facebook users, creates spam messages and sends them to the infected users' friends via the Facebook site. The messages and comments include texts such as Paris Hilton Tosses Dwarf On The Street; Examiners Caught Downloading Grades From The Internet; Hello; You must see it!!! LOL. My friend catched [sic] you on hidden cam; Is it really celebrity? Funny Moments; and many others.
Messages and comments on MySpace and Facebook include links to YouTube. [skip].pl. If the user clicks on this link, s/he is redirected to http//youtube.[skip].ru, a site which purportedly contains a video clip. If the user tries to watch it, a message appears saying s/he needs the latest version of Flash Player in order to watch the clip. However, instead of the latest version of Flash Player, a file called codesetup.exe is downloaded to the victim machine; this file is also a network worm. The result is that users who have come to the site via Facebook will have the MySpace worm downloaded to their machines, and vice versa.
"Unfortunately, users are very trusting of messages left by 'friends' on social networking sites. So the likelihood of a user clicking on a link like this is very high," says Alexander Gostev, Senior Virus Analyst at Kaspersky Lab. "At the beginning of 2008 we predicted (http://www.viruslist.com/en/analysis?pubid=204791987#tendencies) that we'd see an increase in cyber-criminals exploiting MySpace, Facebook and similar sites, and we're now seeing evidence of this. I'm sure this is simply the first step, and that virus writers will continue to target these resources with increased intensity."
Kaspersky Internet Security 2009 detected these threats proactively and signatures were added to the database on 31 July 2008.
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