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An Anonymous Coward writes:

Today I'd like to revisit an often ignored/known method for tracking/hacking for SN discussion!

Ultrasound Tracking Could Be Used to Deanonymize Tor Users
https://www.bleepingcomputer.com/news/security/ultrasound-tracking-could-be-used-to-deanonymize-tor-users/ [bleepingcomputer.com]

Ultrasound Cross Device Tracking techniques could be used to launch deanonymization attacks against some users
https://gitlab.torproject.org/legacy/trac/-/issues/20214 [torproject.org]

Your home's online gadgets could be hacked by ultrasound
https://www.newscientist.com/article/2110762-your-homes-online-gadgets-could-be-hacked-by-ultrasound/ [newscientist.com]

Beware of ads that use inaudible sound to link your phone, TV, tablet, and PC
https://arstechnica.com/tech-policy/2015/11/beware-of-ads-that-use-inaudible-sound-to-link-your-phone-tv-tablet-and-pc/ [arstechnica.com]

Meet “badBIOS,” the mysterious Mac and PC malware that jumps airgaps
https://arstechnica.com/information-technology/2013/10/meet-badbios-the-mysterious-mac-and-pc-malware-that-jumps-airgaps/ [arstechnica.com]

Scientist-developed malware prototype covertly jumps air gaps using inaudible sound
https://arstechnica.com/information-technology/2013/12/scientist-developed-malware-covertly-jumps-air-gaps-using-inaudible-sound/ [arstechnica.com]

Using Ultrasonic Beacons to Track Users
https://www.schneier.com/blog/archives/2017/05/using_ultrasoni.html [schneier.com]

Ads Surreptitiously Using Sound to Communicate Across Devices
https://www.schneier.com/blog/archives/2015/11/ads_surreptitio.html [schneier.com]

235 apps attempt to secretly track users with ultrasonic audio
https://boingboing.net/2017/05/04/235-apps-attempt-to-secretly-t.html [boingboing.net]

Leaking Data By Ultrasound
https://hackaday.com/2020/12/06/leaking-data-by-ultrasound/ [hackaday.com]

Original Submission