MySpace Shockwave Flash Hack
These threats are interesting because they are not “classic” threatswhere you must download content, save it, and execute it from yourmachine. These threats do not modify your local machine, but theyreplicate solely within the context of the service provider (in thiscase MySpace). So, they don't infect your machine per se, but they doinfect your virtual space on the service provider's servers; leavingnothing for local machine security products such as antivirus ordesktop firewalls to scan for after the space has been infected.
Thanks to http://www.chaseandsam.com/ and kinematic.theory for the initial heads-up.