Site hacked via "function ClearError etc."....

Stumbled upon this via: http://fetch.scritch.org/%2Bfetch/?url=jornadasweb.com.ar&useragent=Fetch+useragent&accept_encoding=

 function ClearError() {return true;}
window.onerror = ClearError; 

and XSS exploit *-> http://killmalware.com/jornadasweb.com.ar/#
Flagged two instances: http://sitecheck.sucuri.net/results/jornadasweb.com.ar/#sitecheck-details
Description of hack: https://wordpress.org/support/topic/site-hacked-tonight-info-and-questions

polonus