Websites with flash ads, or a leak from Blizzard's end, in your case.
You heard me. Adobe Flash is a fairly hefty vector for mal issues nowadays, and it's pretty much non-scannable by anti-malware/antivirus programs. If you have websites with a flash advert up when you log into WoW, there's a possibility that your login/password can be nicked. They target these adverts at WoW-related sites - several months ago, one was found appearing on the wow.com blog site, wowhead, and several others.
I highly suggest running some form of no-ad plugin for your browser.
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-- Taryble
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