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Hacking For Beginners – Manthan Desai 2010 Call Spoofing / Forging • Call forging is method to spoof caller id number displayed on the mobile phone/landline. • It relies on VoIP (Voice over Internet Protocol) • VoIP is emerging & exciting innovation as far as Information & communication technology is concerned. • Can be considered as GEN Next Cyber Crime. About Caller Id Forging/Spoofing Caller ID Forging the practice of causing the telephone network to display a number on the recipient's caller ID display which is not that of the actual originating station; the term is commonly used to describe situations in which the motivation is considered nefarious by the speaker. Just as e-mail spoofing can make it appear that a message came from any e-mail address the sender chooses, caller ID forging can make a call appear to have come from any phone number the caller wishes. Because people are prone to assume a call is coming from the number (and hence, the associated person, or persons), this can call the service's value into question. Basics of Call Forging Firstly the voip is used to call via internet PC to a telephone. In the Voip there is a loop hole which allow a intruder to spoof a call. There are many website on the net which provide the facility of the internet calling. This website work as follows,first the call the source phone no then the destiation number and then bridge them togather. Here there is no authentication done by the website and server are normally located in US and so tracing of the intruder is not possible. Thus the intruder logs on to this server and gives a wrong source number and then place a call over internet which is actually a spoofed call which shows wrong identity. Also there a no laws regarding the call spoofing in India and so a intruder if gets traced is easily backed by the loophole of no laws for it. thus if you get calls from other numbers dont trust it they may be spoofed calls. w w w . h a c k i n g t e c h . c o . t v Page 74
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 SMS gateway. The identity of the sender is attached to the SCCP packer of the SMS. 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 delivering to 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. 0791 7283010010F5 040BC87238880900F1 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 a trailing 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 w w w . h a c k i n g t e c h . c o . t v Page 75
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