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They had inbound open ports to allow their maintenance managers to change settings store managers were messing with, probably. But why they didn’t take security precautions to prevent that I don’t know. Probably because they’re career hvac techs and it doesn’t occur to them that someone would want a freezer to stop working.
What were the hackers after? Ransom ware?
Seems like pure destruction to me, most likely from a nation state (who else would have motive, means, and opportunity?). Maybe it's retaliation for that Russian bot farm that got blown up?
A practice run for the Chinese hackers who've already infiltrated much of American infrastructure.
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It's still weird that the guy building the web interface would do it, even if he was a career HVAC tech that had gotten pushed into software dev. But it's plausible.
That's a fun thought. Ransomware naively feels a little weird for me. Telling the people they need to pay you gives them a window to replace the controllers (or just turn off internet access and hope you didn't leave a time bomb). But I may be missing an attack vector there, or they might have been working toward the timebomb and just noticed enough devices they got interrupted.
There's some more esoteric options, though. Hitting food supplies is famously one a target for causing political unrest. Just shorting a few of the supermarkets would potentially be a very remunerative option, though it'd be a hilarious way for the hackers to get caught (or lose money). Burning Danfoss itself might be a thing, especially for the more ideological actors -- even if the threat genuinely doesn't exist for their newer products (not a given), there's no way its buyers avoid a security audit, and no way Danfoss avoids a ton of support costs downstream of that, on top of lost goodwill. Political or nationalist drives are always an option, if a goofy one. "Hey, Look At Me" or a personal grudge turned public is just plain dumb, but if any attack could be executed by a script kiddy, this one could.
Not sure some other options.
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