Yourmusic.com ad banners sering up malware

For at least a week, Virgin Media (and probably other sites) have been serving up compromised ads for Yourmusic.com that direct their users to a fake anti-spyware site called MalwareAlarm.com (via malware-scan.com) - which is actually a trojan designed to scare people into parting with their cash, while infecting their machines at the same time.

How the banners got compromised is a mystery, but it's clearly the work of a third party. More here.