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[Nazi254]

SS7-based cyberattacks constitute a significant threat to mobile communications, leveraging security flaws inherent in the Signalling System No. 7 (SS7) protocol to intercept and compromise voice calls and text messages across cellular networks.


These attacks manipulate the authentication mechanisms of SS7-enabled communication infrastructure, enabling malicious actors to illicitly eavesdrop on SMS and voice communications. By falsifying Point Codes—a unique identifier for network nodes—attackers can masquerade as legitimate components such as Mobile Switching Centres or Visitor Location Registers, thereby redirecting calls and messages covertly. This method facilitates unauthorised access to confidential data without detection.


A. SS7 Exploitation via SigPloit


Repository: GitHub - SigPloiter/SigPloit: SigPloit: Telecom Signaling Exploitation Framework - SS7, GTP, Diameter & SIP


SigPloit is a specialised tool designed to exploit vulnerabilities within SS7 networks through multiple methodologies, including:


- Mobile Application Part (MAP) Exploitation:

As the primary attack vector within SigPloit, MAP facilitates exploits such as subscriber location tracking and SMS interception. The tool dispatches MAP messages—including UpdateLocation and AnyTimeInterrogation—to interact with Home Location Registers, VLRs, and MSCs, thereby retrieving a victim’s real-time location or diverting messages to an attacker-controlled endpoint.


- Point Code (PC) Spoofing:

Attackers can forge legitimate signalling points (e.g., MSCs or HLRs) by mimicking their Point Codes. This deception allows adversaries to transmit falsified messages under the guise of trusted network elements, manipulating call routing to intercept communications.


- Man-in-the-Middle (MitM) Attacks:

SigPloit replicates MitM attacks by altering call or SMS routing instructions issued by MSCs or Signal Transfer Points. By modifying these routing directives, attackers can position themselves surreptitiously within the communication channel between two parties.


B. Gaining Access to the SS7 Network via SIGTRAN


Before initiating an attack on the SS7 protocol, it is first necessary to establish access to the network. This process is strictly controlled due to the significant risks posed by unauthorised interception of calls and messages, among other malicious activities.


One method of obtaining SS7 network access involves leveraging SIGTRAN (Signalling Transport), which facilitates the conversion of SS7 signalling protocols into an IP-based transmission format (TCP/IP).


To interface with a traditional SS7 network or operate SIGTRAN protocols within an IP environment, a SIGTRAN gateway is required. Such gateways are typically supplied by telecommunications equipment manufacturers or vendors. Once obtained, the system must be configured to support the various SIGTRAN protocol layers, including:


- SCTP (Stream Control Transmission Protocol)

- M3UA (MTP3 User Adaptation Layer)

- SUA (SCCP User Adaptation Layer)

- Other relevant protocol layers.


C. Step-by-Step Exploitation of SS7 Using SigPloit


Prerequisites:


A Linux-based OS.

Python 2.7 or later.

Java Runtime Environment (JRE) version 1.7 or higher.

Installation of the SCTP utilities package:


Code: Select all

sudo apt-get install lksctp-tools



1. Installing SigPloit:


Execute the following commands sequentially:


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git clone GitHub - SigPloiter/SigPloit: SigPloit: Telecom Signaling Exploitation Framework - SS7, GTP, Diameter & SIP


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cd SigPloit


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sudo pip2 install -r requirements.txt


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python sigploit.py


2. Intercepting Messages and Calls:


Prior to executing an attack, access to the SS7 network must first be established. As previously outlined, this can be achieved through SIGTRAN configuration.


2.1. Enter: 0

2.2. Enter: 1

2.3. Enter: 0

2.4. Enter: show options

To establish the appropriate settings, consult the readme file located at the following directory:


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SigPloit/Testing/Server/Attacks/Interception/UpdateLocation_Server


2.5. Enter: cat Parameters

Now, you must first assign the necessary IP addresses to your local loopback interface.


Execute the following commands with administrative privileges:


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sudo ip address add 192.168.56.101/32 dev lo


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sudo ip address add 192.168.56.102/32 dev lo


Following this configuration, input the previously obtained values from the configuration file into the relevant fields of the tool.

Image


To initiate operations, execute the following command:


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run


The system is now prepared to monitor and intercept cellular communications. Additionally, you can explore further capabilities such as location tracking, fraud activity, DoS attacks, and so on.


Hardware requirements: A Linux-based OS, a minimum of 4GB RAM for optimal performance, a stable internet connection, and SIGTRAN access (as previously mentioned) via a telecom gateway. Certain attack scenarios may necessitate a software-defined radio (SDR), though SigPloit can still be evaluated in a lab environment without one.


SigPloit’s scope is confined to a controlled lab setting unless direct SIGTRAN access is available (obtained either through a telecoms provider or an unauthorised node), in which case its reach becomes global.


To specify a target phone number, the MSISDN (mobile subscriber number) must be known. After entering the command "show options", locate the field for IMSI/MSISDN and input the number. Subsequently, configure the HLR/VLR parameters, for example:

set MSISDN +1234567890

set IMSI 310150123456789


SS7 attacks are highly complex, and a single tutorial cannot cover every aspect. However, I will try to produce further tutorials. In cybersecurity, SS7 exploitation is regarded as having a high to critical impact. Consequently, maintaining robust OPSEC is essential to avoid prison lol.
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