A couple of years ago I was asked to take a look at a Drupal 7 site that was performing poorly where a colleague had spotted a strange function call in an Application Performance Management (APM) system.
The APM traces we were looking at included a __lamda_func under which was a class called Ratel. Under those were some apparent external calls to some dodgy looking domains.
One of my very excellent colleagues had done some digging and found some more details about the domains which confirmed their apparent dodginess.
