Microsoft too detects them now. Too late, but at least they are updating their signatures fairly rapidly.

Interestingly, both files were first uploaded to VT in 2010, meaning that AV vendors have had chances to analyze them.

Malware vendors usually use these services to test their load. They wouldn't release anything that would get detected on day 0. And I think antivirus vendors do more in-house analysis only if there are reasons to - such as votes from users, or other AVs detecting the sample.