Moved this to McAfee VirusScan Enterprise where hopefully you'll get a quicker answer.
On second thoughts, Web Threats is a better spot.
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Until someone qualified answers you, I did some research.
A Google Search for Cryptowall McAfree has a lot of hits and you'll find that it has been covered by the software since late Spring.
See one blog here: http://blogs.mcafee.com/mcafee-labs/cryptowall-ransomware-built-with-rc4-bricks which states towards the end:
"Your best protection is to back up your data regularly and avoid phishing emails. McAfee customers are already protected from this threat."