Helsinki-based F-Secure told users to ignore instant messages with the
subject head “MSN Messenger 8 Working BETA” that go on to claim that
“Messenger 8 BETA has been leaked!”

The message, which refers to an alternate name for the upcoming
Live Messenger, also sports a link. Users who click on the link, then
download and run the executable, are in reality installing the Virkel.f
Trojan.

TechWeb News