Hacking For Beginners – Manthan Desai
2010
SMS Forging
• SMS is one of the most popular means of communications.
• SMS Forging is the method to spoof sender id of SMS.
• One can send SMS to international Number from any number of sender’s choice.
• Facility to choose sender id upto 11 characters/name.
SMS ROUTING IN GSM-
First of all the sender send the SMS via gateway. The identity of the sender is attached to the SCCP packer of theSMS. The SMS once reach the SMS gateway is routed to the destination Gateway and then to the receiver’s handset.There are many ways by which we can send SMS to the SMS gateway.One of them is to use internet.Now the concept of SMS forging lies in changing the SCCP packer which contains the sender information prior deliveringto the SMS gateway.The intruder can change the SCCP packet and can send that packet to any of the receiver as a spoofed SMS.Some of the Website on the net also provide this facility.
07 91 7283010010F5 04 0B C8 7238880900F1 0000993092516195800AE8329BFD4697D9.
07- Length of the SMSC information (in this case 7 octets)
91 - Type-of-address of the SMSC. (91 means international format of the phone number)
72 83 01 00 10 F5 - Service center number(in decimal semi-octets). The length of the phone number is odd (11), so atrailing F has been added to form proper octets. The phone number of this service center is "+27381000015".
04- First octet of this SMS-DELIVER message
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