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.
┌──(root💀OffSec)-[~]
└─# git clone https://git.osmocom.org/gr-gsm
┌──(root💀OffSec)-[~]
└─# cd gr-gsm && mkdir build
Enter inside the build folder and execute cmake:
┌──(root💀OffSec)-[~]
└─# cd build
┌──(root💀OffSec)-[~]
└─# cmake ..
Create the settings files for GNURADIO and compile the code:
┌──(root💀OffSec)-[~]
└─# mkdir $HOME/.grc_gnuradio/ $HOME/.gnuradio/
Now its time to compile the code
┌──(root💀OffSec)-[~]
└─# make
Install GRGSM from Repos
┌──(root💀OffSec)-[~]
└─# sudo apt install gr-gsm
GRGSM Tools
![[Free] GSM Passive Sniffing Guide Fundamentals 8 GR GSM Tools](https://www.offensive-wireless.com/wp-content/uploads/2021/07/Screenshot-from-2021-07-18-04-39-01.png)
grgsm_scanner
![[Free] GSM Passive Sniffing Guide Fundamentals 9 How to capture GSM traffic](https://www.offensive-wireless.com/wp-content/uploads/2021/07/Screenshot-from-2021-07-18-04-42-37.png)
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How to capture GSM traffic
grgsm_capture
![[Free] GSM Passive Sniffing Guide Fundamentals 10 grgsm_capture](https://www.offensive-wireless.com/wp-content/uploads/2021/07/Screenshot-from-2021-07-18-04-40-13.png)
grgsm_livemon
![[Free] GSM Passive Sniffing Guide Fundamentals 11 grgsm_livemon](https://www.offensive-wireless.com/wp-content/uploads/2021/07/Screenshot-from-2021-07-18-04-43-31-1024x369.png)
grgsm_trx
![[Free] GSM Passive Sniffing Guide Fundamentals 12 grgsm_trx](https://www.offensive-wireless.com/wp-content/uploads/2021/07/Screenshot-from-2021-07-18-04-46-20-1024x591.png)
grgsm_decode
![[Free] GSM Passive Sniffing Guide Fundamentals 13 grgsm_decode](https://www.offensive-wireless.com/wp-content/uploads/2021/07/Screenshot-from-2021-07-18-04-48-22.png)