The victims are lured with messages seemingly posted by their friends claiming that they have received a "100rs free recharge". Following the offered link, they land to a page asking them to enter their Facebook login credentials in order to get it:
Once the account details are entered and the "Log In" button is pressed, the page redirects users to a page mimicking a Facebook one, which asks the user to complete a survey or to in order to unlock the recharge option.
In the background, the page sends the recorded login credentials - in clear text via a HTTP POST request - to a remote server operated by the scammers.
The scammers then use the login credentials to access the victims' Facebook accounts, change information contained in them (including the password and the email address) and post the same message that lured in the victims in the first place.
The affected users are consequently not only endangering their friends, but are also unable to immediately do anything about it. "Even if the victims try to reset their passwords, they will never get the password reset email from Facebook," points out the researcher.