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Low cost/janky China implant: take an ATtiny microcontroller, solder it onto the unused SOIC8 SPI flash footprint on a Supermicro motherboard (pinout is compatible), program it to override some reads, stick a decoy transformer/coupler coil on top.
Macronix doesn't list drive strengths for their SPI flash, but I'm getting the gut feeling that it's lower than the ATtiny (20-40mA). And honestly, this would meet most of Bloomberg's description, except for the exact size and photos.
Should we start to worry about PIC10F222 in SOT-23 too?
I'd even push to re-etch the markings instead of anything decoy on top... far less suspicious - it has a footprint, it fits on the board, etc...
I'm really intrigued if this is the route in though... because if it is, then it's not likely to deal with firmware updates well... either rendering the BMC unbootable because it stamped on the wrong bits, or being unable to surgically modify because it's now a cow not a horse...
An ATtiny is not really fast enough to keep up with the clock speeds of modern day SPI flash, though.
If it starts up with slow timings on boot it might just make it (and then you do the rest of the work on the BMC itself).
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