Its A very simple which need to embedded with a html to page or link when it is opened in your android device automatically your phone resetting will be done without any warning ..
The source code is some thing like this
Are You Serious About Your Phone data?
So far, only selected Samsung phones have been demonstrated to have a USSD code that performs a factory reset.
The following devices have been confirmed to be vulnerable to dialing USSD codes from a Web page:
HTC Desire HD
HTC Desire Z
HTC One W
HTC One X
HTC Sensation (XE) (running Android 4.0.3)
Motorola Atrix 4G
Motorola Razr (running Android 2.3.6)
Samsung Galaxy Ace, Beam and S Advance
Samsung Galaxy S2
Samsung Galaxy S3 (running Android 4.0.4)
How to stay protected/safe from it?
Thanks and site will be up soon or from the first week of this oct we will give darksite a new look with better information :) take care