You can communicate over audio if both devices have mics and speakers. It's a way to avoid detection. Someone had mentioned data transmission underwater through sound. Sound and recieve data with audio pretty well. And you can pretty much translate the way computer talked over telephone with tones. I think you can get up to 4Mbps over with audio. That's enough to exfiltrate data at slow trickle and run without any need for networking and can't be detected with networking packet collection. My thoughts were that this kind of stuff was done in the ultrasound frequencies so it could not be heard.
There were experiments with something similar but using screen flickers and webcams. But the rate of transmission is lower than whatever the refresh rate on a given monitor so it's really slow.
But as mentioned, it's probably some kind of static.
Here's some autistic trivia for you. You know sometimes your computers speakers will make a noise right just before your cell phone rings? You can hear WPS requests on the cell phone. I was doing a WPS PIN search on my home router with reavers and I was talking on the phone. I could hear the requests. You can probably hear authentications and things like that as well.
Question can you hear any of this over your cell phone when it's going on?
Owen Taylor
I have a Ham Radio licence (equivalent to the 'Extra' in the USA), so I don't need the technology for babbys drill. (fwiw, I first noticed the signal when running WSJT-X between two laptops without radios, and seeing how far and how attenuated I could go..)
Definitely looking like it's the housemate's iphone now, as I left the recorder running during the weekday when we were both at work, and the mysterious tone only appeared when they were around.
Daniel Moore
He probably installed some rouge data gathering app while browsing porn
Christian Smith
Interesting.
Without getting carried away with the tinfoil, it's possible the roommate has installed some app that's emitting ultrasounds that are allowing him to be tracked. Theoretically, you could set up 'beacons' all around town to listen for these uniquely identifiable yet inaudible signals, and get an approximation of his location every time it was emitted. Current day Bluetooth and WiFi trackers work on this principle.
Xavier Gutierrez
Was going to say that it was probably an old longwave beacon that hasn't been decommissioned yet, but now it doesn't sound like it. You can pick up longwave beacons by just sticking the end of a large spool of wire into your mic jack. Boom, longwave radio with bigass antenna.
Elijah Green
'uXDT tracking' is this
Ryan Brown
There's a few orders of magnitude difference between 1040 Hz and 1.040 MHz..
Run airodump-ng and read run a script to read through the CSV once every so often and RE for whatever MAC address you are tracking. That's funny I just though of something. If you are running your you wireless card in monitor mode you can still communicate via audio while your NetworkManager is stopped.
Honestly I like the idea of this technology. Send data over sound and communicate over sound. It's a low bandwidth low range convert communications channel.
You could send data through aluminum for probably greater distances or if there's is some part of the building's structure like plumbing pipes or framing. But probably they have something.
Here's a theory anons. If you have a sound device that can exfiltrate data but at limited range you can use sound to vibrate something like a window in the room you can use that vibration. You can use the object to modulate light reflected from it. Something like a lazer listening device. youtube.com/watch?v=Ylo72DyapVY
