I don't pass along every single attack I read about using Twitter, but this one described on Trend Micro's blog certainly caught my attention. Koobface seems to have updated it's components to increase mayhem on a user's Twitter (and other social networking sites).
According to the article
The new component uses a victim’s Twitter account to post tweets using Internet-browsing cookies to log in to the target user’s account. Tweets can more successfully be posted when the victim is currently logged on to his/her Twitter account as the ‘evil’ Koobface binary runs in the background.
The content is allegedly updated from a C&C server and then uses shortened URLs from Tinyurl.com to further obfuscate the threat.
In other big Twitter related attack news this week, Sophos has posted a video showing exactly how Guy Kawasaki's feed was exploited and used to try to propagate malware. It's interesting that they used a Mac to show how this exploit worked.
### Warning, this video shows the researcher going to the exploit site which contains erotic imagery which may be offensive or inappropriate in some environments ###
The link to the video is located HERE