Sharing Security Developments, and Best Practices for corporate and home users
Most likely AV protection will be forthcoming, however most importantly the MS07-017 patch should be promptly applied 
New Variant of ANI exploit emerges http://isc.sans.org/diary.html?storyid=2648
quote:
What a shocker - malware authors are playing cat 'n' mouse with antivirus signatures.
Roger Chiu of Malware-Test Lab submitted a .ani file observed in the wild that was not detected as malicious by any popular antivirus tools. As with many other ANI attacks, this was presented as a CURSOR object in a DIV element on a compromised web site