[Free] GSM Passive Sniffing Guide Fundamentals

Learn How to GSM Passive Sniffing works using GRGSM tool created by Piotr Krysik, transmit and decode GSM packets using SDR.

The gr-gsm project is based on the gsm-receiver written by Piotr Krysik (also the main author of gr-gsm) for the Airprobe project. The aim is to provide set of tools for receiving information transmitted by GSM equipment/devices.

Piotr Krysik

To install gr-gsm we have two options install it from source or from distro repos. First I will explain how to install it from source.

Compile GRGSM from source

One option to install GRGSM is to compile it from source, clone the git repo and create a folder to build the project.

git clone https://git.osmocom.org/gr-gsm

cd gr-gsm && mkdir build

Enter inside the build folder and execute cmake:

cd build

cmake ..

Create the settings files for GNURADIO and compile the code:

mkdir $HOME/.grc_gnuradio/ $HOME/.gnuradio/

Now its time to compile the code

make

Install GRGSM from Repos

sudo apt install gr-gsm

GRGSM Tools

grgsm_scanner

-b BAND

How to capture GSM traffic

grgsm_capture

grgsm_livemon

grgsm_trx

grgsm_decode

GSM Passive Sniffing

GSM Penetration Testing

https://fahrplan.events.ccc.de/congress/2010/Fahrplan/attachments/1783_101228.27C3.GSM-Sniffing.Nohl_Munaut.pdf