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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.
I’d expect the drive strength is only 8ish mA based on similar flash usage
anyone managed to find an 'infected' motherboard?
Looking at some Winbond flash, also not specified but it is programmable and defaults to "25%" ... be interesting to hack up a proof of concept
There's an ATtiny that comes in a chip scale package, so it'd fit fine. My current theory is that they MitM'ed SPI flash with a find/replace on the data pin using an MCU or FPGA in a CSP package that they potted and coated to look like a regular passive.
The reason I'm going with a potted CSP over an ASIC is that the latter is more expensive, more complicated, requires less common skills, and requires whoever designed it to loop a silicon foundry in on the project (which is a terrible idea if you're worried about leaks)
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