There have been too many spammers and keylogger attempts lately. Here are a few ways to defend yourself.
1) Don't use your WoW logon information anywhere else but for WoW. If your guild has a website, for example, and those passwords get stolen, then you're sunk.
2) The blizzard authenticators are back in stock (for now) http://www.blizzard.com/store/ and search for "authenticator". You can get a free version via iTunes for your iPod.
3) Don't share your account info, not even with friends. While they wouldn't do anything deliberately to mess you up, they might also get hacked.
4) Keep all of your software up to date to ensure vulnerabilities are patched. Mac users, you're not impervious to malware, just less targeted, so do stay on your toes. No computer system can last for long if you're inattentive and have admin rights (http://blogs.zdnet.com/security/?p=3157)
I'd speculate the jump lately might have something to do with folks wanting to get more gold by any means necessary, even gold buying. If you or a friend need help making money, do some teamwork. There's a fair amount of money to be made just by doing things like dailies, rampaging old instances and vendoring everything and the like. Nobody needs dualspec (or whatever) so bad they can't wait a bit, especially if it ends up getting you hacked in the process.
Sorry about the slowness of updates this week. I have the feeling we're all getting some extra game time in. Enjoy Ulduar and your weekends!
Do not play Overwatch! - New permanent page
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