Not social engineering experts
"The unidentified bot herders behind the campaign are experts at using social engineering to extend their army of botnet clients."
Yeah right. I recieved one of these emails with the subject "'dude don't send that stuff to my home email..." yesterday. It came from an address I'd never heard of so I deleted it without opening it. The thing that really made me suspicious was the subject line, after all if the mail contained links to porn or whatever it's your work email you wouldn't want it sent to, not your home email. If they were social engineering experts they'd have thought of that.