"What was once malware designed to steal data from financial institutions has evolved into a social network threat," says John Weinschenk, CEO at Cybersecurity company Cenzic. "Bank account numbers and Facebook log-in credentials seem very different, but to hackers, they are equally as lucrative."
So, now the question is how Ramnit works, it is simple when you are infected by ramnit then it will stole all your system information and send to the hackers database. It simply stole information of your Facebook login and password and then login to your account and send different types of links to your friends, whenever your friends click on that link your friend get infected too.
Beware of this Backdoor and use up to date antivirus and malware to protect your self and Facebook account from being hacked.