Possibly Israel, or even the US made a deal with a Siemens engineer who never left the home office. We kind of did it to the Russians in the 80s. We banned export of American computer equipment to the USSR then made sure the USSR got preloaded American computer equipment from illegal channels in “neutral” Sweden. The Russians them spent vast quantities of rubles barking up wrong trees. I guess we didn’t virus them, just sold them some special programs.
I remember that being process control chips that actually led to some pipeline explosions.