Call Me Maybe: Establishing Covert Channels By Abusing GSM AT Commands


From the ’60s and ’70s, the hacker community started to design tools and procedures in order to take advantage of telephone networks (such as blue boxes, phreaking, etc.). These old school hacking techniques are coming back with the commercialization of cheap open hardware which establish new threats.

In this talk, we are going to contextualize some phreaking practices and introduce new threats including a way to modify the behaviour of GSM (Global System for Mobile Communications) antennas in a mobile phones using AT commands to establish covert channels.ย 

We will show that it is possible to transfer information without paying and we will demonstrate how we can establish a covert channel without a ‘standard GSM connection’ and still send tens of bits per minute without incurring any costs.

Location: Track 1 Date: April 13, 2018 Time: 3:00 pm - 4:00 pm Alfonso Munoz Jorge Cuadrado Saez