SS7 hack or signaling system 7 hack is the process of getting calls or SMS for an actual subscriber, on another mobile number, or in an application. For many services (e.g banking etc.), a person is verified by using SMS or a call. If somehow call and SMS can be routed to another number then it is possible to hack.
We will explain, the ss7 protocol and call flow for getting calls and SMS over another number/application.
Ss7 vulnerability exposes the network for SMS and voice hack. Along with this, once access to the ss7 network, the real-time location of a person can be obtained.
SS7 is the traditional network that uses standard ISUP and MAP protocol for call and SMS.
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SS7 hack is not simple as it looks, people claim to install software and then just enter phone number to hack SMS or calls. Getting calls and SMS via a hack is the process to connect to the ss7 network and run an application so that the home network of an original subscriber gets the impression that software is the roaming VLR/MSC node in a network. The first step is to get the ss7 connection.
Get an SS7 Connection for the hack:
Get SS7 Global Title and Point Code: For an SS7 connection, one should have a Global Title and a point code (international), a local point code (local, between you and mobile operator )can be used, depends on the ss7 connection provider. If one is a mobile operator, then get this from the standard GSM body. New network code is assigned by gsm so that you can have a big range of global titles or MSISDNs and IMSIs.
If not a mobile operator, one can take a global title on lease from a mobile operator. Once you have GT, now there are the following options.
SS7 connection via an aggregator: In this, you can connect to an SS7 aggregator and they can publish your GT, on all networks. So any traffic coming to your GT will be forwarded by aggregator towards your node or application. Mostly MVNO does this, they have GT ranges, those are published to an aggregator for connecting mobile network operators globally.
Directly with a Mobile Operator: In this, you will have direct links with mobile operators, each will set routing for your GT, towards the serving node. In this, you need to connect each mobile operator Individually.
SS7 vs Sigtran:
If you are using pure SS7 (E1/T1), then the box with the application should be on the premises of mobile operators. If using SIGTRAN, which is IP based, You can have your box in a data centre on the cloud.
Ss7 hack tool or Software:
Once one has an ss7 connection. Now time to develop an ss7 application over GSM MAP signaling. SDK for ss7 provides the required ss7 stack and libraries for developing ss7 hack software. Before developing the application first finalize the requirements. If one wants to receive SMS, then the application should be developed to handle protocol messages for SMS. Now the ss7 application will simulate as it is a real device.
Application Registration as a real phone:
The first step is to register the application as a phone registers in the roaming network. This required the IMSI of the sim card, to which the mobile number belongs. Mobile number everyone has but IMSI doesn’t. So the first step is to get IMSI. Hacking Application sends SRI-SM with the phone number to the HLR, which sends IMSI and roaming information in response. Roaming information includes the county code and area code.
From IMSI the application builds the location update along with other parameters. Then open a TCAP dialogue to the SS7 node. The open dialogue needs to fill SCCP called party address and SCCP Calling party address. Called Party address is derived from IMSI and the calling party address is the GT of the software application.
During Update Location, HLR will respond with ISD or Insert Subscriber Data. The software application needs to acknowledge the ISD to the HLR, else the update location procedure will fail and the application will not attach as a phone. One HLR sends an update location ACK, which means registration is done.
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SS7 Hack for SMS:
Once the application registered with the home network. The global title of ss7 hack software updated on the home HLR as an outcome of the update location procedure. When a request for authentication for mobile terminated SMS starts. HLR gets SRI-SM query from the hack application, in the response of SRI-SM, HLR sends have visiting MSC number and IMSI. In our scenario, the MSC number is the GT of the application. The sender SMS will send the SMS to the software application using the MSC number. Now it is the application’s responsibility to decode the message and display the message as a user-readable string. Now you have the authentication code you were looking for.
SS7 Hack for Voice:
For voice, after phone registration call flow. The hack software should activate the call forwarding to the new number. While activating call forwarding, the ss7 hack tool can send the type of call forwarding and the mobile number where the hacker wants to receive the call. The call forwarding type can be “Call Forwarding Unconditionally”. This will enable call forwarding all the time. In this case, even the mobile user never comes to know that his call has been hacked. After voice verification, the call forwarding can be removed.
SS7 hack applications examples:
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Any application which required user verification from SMS or voice can be hacked by the ss7 network. We will cover the ss7 call flows for WhatsApp and Facebook.
ss7 hack Whatsapp:
Whatsapp is used everywhere. It does the message and file transfer over the IP network. It connects your phone book to the others using phone numbers. So no need to add a contact explicitly. Like in skype, we need to create an account and need to add other skype ids before any communication. But with this app, the phone number is the profile id. Installation of WhatsApp requires user authentication via SMS.
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If WhatsApp needs to hack, after installation, run the ss7 hack software app and received the authentication message on the hack software app. Enter the code in installed WhatsApp. Now you can have messages on your WhatsApp, while the number belongs to another guy.
ss7 hack Facebook:
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Facebook also does authentication via SMS. One can get SMS on an ss7 hack software.