In June, we saw an explosive rise in the number of Koobface modifications. Number of variants we detected jumped from 324 at the end of May to nearly 1000 by end of June. And this weekend brought another flood, bringing us up to 1049 at the time of writing. As we ve said before, Koobfaced spreads via major social networking sites like Facebook and MySpace. It s now spreading via Twitter as well. With everyone now having a Facebook page, Twitter account or similar, the pool of potential victims is growing day by day.
Source: https://threatpost.com/koobface-worm-infections-exploding-070609/72920/