Van Eck phreaking came to mind immediately - which wouldn't require any remotely malicious code to be run. Anyone with more knowledge than myself know if Van Eck phreaking is still an attack vector on modern technology?
https://www.engadget.com/2007/04/21/laptops-and-flat-panels-...
Markus Kuhn has since discovered that by tuning into the radio emissions produced by the cables running into a monitor, hackers can garner the pixels one at a time, and carefully stack them together to form a picture of someone else's screen. Reportedly, Markus was able to "see a PowerPoint presentation from a stand 25 meters away (pictured)," and he also noted that laptops with metal hinges were particularly good targets as they tended to broadcast the necessary signals quite well.
One of my favorite elements of The Laundry Files series, is the old spook who only uses a Memex machine because of van Eck phreaking.
There is a scene in Neal Stephensons novel Cryptonomicon (1999), where the protagonist accesses his laptops data by manipulating the scroll-lock LED using Morse-code, as he is fairly certain he is being van-eck phreaked.
This one is particularly great because an air gap is assumed by default to be very secure.
So you may think things are fine and dandy cause you gotta fancy lil air gap but lo and behold your data has been exfiltrated through the power lines for years.
They also have a double outer shell, with space between the two walls, where speakers play white noise.
All this is public knowledge for many decades now.
Food for thought.
If anyone is surprised by power line exfiltration they just didn't do a basic google search.
Or still thinks that computers are magic or that electricity is binary (either on or off).
Sauce: https://www.youtube.com/watch?v=_g9yUiAHiFo
This talk is old and we've advanced a fair bit since then.
I just thought some of us old fogeys might could use the tip. (Y'know, if we're not 1337 enough...)
(I'm fairly certain it's intentional, I do it a lot too)
(I really was just trying to fill in the blanks for anyone who hadn't encountered "sauce" as internet slang for "source" aka "provenance" yet. Given the responses though it feels like I accidentally trolled. Please excuse me. ;-)