105 posts
    Has referred 1+ members Has sold $40,000+ on Envato Market Has been a beta tester for an Envato feature Has collected 1+ items on Envato Market
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butterflymedia says

There is a WordPress worm that adds malicious (more or less) code to all functions.php files on the server (either online or offline/local). Here’s my StackExchange question, still working on finding an automated way of removing it.

http://wordpress.stackexchange.com/questions/74367/how-to-remove-the-automated-code-posted-in-functions-php
105 posts
    Has referred 1+ members Has sold $40,000+ on Envato Market Has been a beta tester for an Envato feature Has collected 1+ items on Envato Market
+5 more
butterflymedia says

UPDATE AND SOLUTION :

Clean all the malicious code (see my PasteBin link above) from all functions.php files (best to check globally using a text editor like Notepad++) and you’re done. Check all downloaded themes for the code in functions.php file. There are more themes infected with this code online.

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