A piece of malicious advertisement that leads to a Vietnamese website has been displayed for a couple of hours on all Yahoo Messenger windows in the world. When run, the application hijacks the start page of each one to hxxp://laban.vn [handle with care]. This would be normal behavior for a browser add-on or toolbar, but there is more to the application than that: it adds itself to the Windows startup entries, so it can start at every system boot. The removal tool can be downloaded for free from the Bitdefender Labs Downloads Area.”]