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Modmobjam

A smart jamming proof of concept for mobile equipments that could be powered with Modmobmap

For more information, this little tool has been presented during SSTIC rump 2018:

Warning

You should be warned that Jamming is illegal and you're responsible for any damages when using it on your own.

Prerequisites

  • a radio devices that is enabled to transmit signal (HackRF, USRP, bladeRF, and so on.)
  • GNU Radio installed
  • Modmobmap to perform automatic smartjamming: https://github.com/PentHertz/Modmobmap

Usage

Manual jamming

If you have a HackRF or any device compatible with osmocom drivers, you can directly run the code provided in GRC/jammer_gen.py as follows:

$ python GRC/jammer_gen.py

Note that compatible devices with gr-osmosdr are the following:

  • FunCube Dongle through libgnuradio-fcd
  • FUNcube Dongle Pro+ through gr-fcdproplus
  • sysmocom OsmoSDR Devices through libosmosdr
  • Nuand LLC bladeRF through libbladeRF library
  • Great Scott Gadgets HackRF through libhackrf
  • Ettus USRP Devices through Ettus UHD library
  • Fairwaves UmTRX through Fairwaves' fork of Ettus' UHD library
  • RFSPACE SDR-IQ, SDR-IP, NetSDR (incl. X2 option)
  • RTL2832U based DVB-T dongles through librtlsdr
  • RTL-TCP spectrum server (see librtlsdr project)
  • MSi2500 based DVB-T dongles through libmirisdr
  • SDRplay RSP through SDRplay API library
  • AirSpy R820t dongles through libairspy

For those who want to use another device, edit the GNU Radio block schema GRC/jammer_gen.grc:

$ gnuradio-companion GRC/jammer_gen.grc

Then you can configure the central frequency with the QT GUI to target a frequency. But this tool has also a feature to do it automatically.

Automatic smartjamming

To automate jamming, you can first get a list of we the Modmobmap that saves a JSON file after monitoring surrounding cells in a precise location. This JSON file looks as follows:

$ cat cells_<generated timestamp>.json 
{
    "****-***50": {
        "PCI": "****", 
        "PLMN": "208-01", 
        "TAC": "50****", 
        "band": 3, 
        "bandwidth": "20MHz", 
        "eARFCN": 1850, 
        "type": "4G"
    }, 
    "7-***": {
        "PLMN": "208-20", 
        "arfcn": 1018, 
        "cid": "***", 
        "type": "2G"
    }, 
    "****:-****12": {
        "PLMN": "208-1", 
        "RX": 10712, 
        "TX": 9762, 
        "band": 1, 
        "type": "3G"
    },
    [...] 
}

After generating this file containing cells to jam, you can launch the RPC client that communicate with GRC/jammer_gen.py as follows:

$ python smartjam_rpcclient.py -f cells_<generated timestamp>.json

Then leverage the gain for transmission and you should observe that a lot of noise is overflowing the targeted cells with gaussian noise.

Jamming session

Please note that the delay between each targeted cell can be set with a provided arguments '-d' (see arguments helper).

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