How can I guard myself from Wirelurker?
Do not download third-party apps from untrusted sources.  

In System Preferences, Set:

Security &amp; Privacy --> General --> Allow apps downloaded from: to either

Mac App Store or Mac App Store and identified developers

So far it seems this is only transferable from a computer to device over a usb to iTunes connection, which means the computer must be infected with one of these third party apps.  Also seems pretty limited to China and its third party app store for now.

Digital Trends Article.

PaloAlto Networks Article