Don't Miss: Program a $6 NodeMCU to Detect Wi-Fi Jamming Attacks.It's really cool because the Friend Detector looks through the types of packets smartphones give off both when connected and disconnected to a Wi-Fi network, making it easier to detect a device in either condition.Ĭombined with the beacon swarm tactic for unmasking devices, the Friend Detector can be used to tell when a device has been successfully unmasked by the swarm of fake networks. To show how easy it is to track devices, I searched for an Arduino sketch that uses the built-in Wi-Fi chip of the NodeMCU to track MAC addresses, and I found the Friend Detector This awesome project takes any MAC address you want to monitor and sniffs the air for packets containing that address. Tracking Device MAC Addresses with Arduino A hacker looking to grab a Samsung phone's actual MAC address only needs the person holding it to look at nearby Wi-Fi networks to send a burst of packets with the device's real MAC address. Strangely, I observed that Samsung Android devices emit bursts of probe frames using the real MAC address any time you turn on the screen or open the Wi-Fi network selection menu. In addition to seeing a Wi-Fi network in the preferred network list, being actively connected to a network will also actively reveal the permanent MAC address of the device This means if you want to track someone coming home or walking by a coffee shop with a common network name, MAC address randomization won't get in your way. More Info: Use an ESP8266 Beacon Spammer to Track Smartphone Users.Upon detecting a familiar network stored in the device's preferred network list, the device will attempt to join the network and become trackable again This can be seen in action in my post on tracking smartphones with a beacon spammer attack, in which we create many fake networks to unmask nearby devices. There are several conditions which cause a phone to revert to its real MAC address, one of which is being in proximity to a network the device has connected to before. MAC address randomization is helpful for preventing some types of tracking, but in tests on various Android phones, it was clear the MAC address randomization is far from perfect. MAC Address Randomization: It Sort of Works
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