This is very interesting. How did you come across this group? What are their motivations, aside from just making money and fucking shit up?
tbh I can't imagine there are many reputable security researchers here looking for a story, but you should still post more info anyway, cause this is the shit I come to EndChan looking for. if you're looking for someone who can attach their name and expertise to this story though, maybe send Brian Krebs a message about it. this seems like the kinda thing he'd love to help with.