Yes USB sticks are a risk for industrial control environments. In case you need them: better scan them before you plug it in. Or even better, if it’s only extraction from the Industrial control system, use a brand new shrink wrapped USB stick. So make sure you have a supply of 365 USB sticks a year.
In case you want scanning: sheep dip. The term sheep dipping comes from another sector: farming. Farmers are bathing their sheep into some kind of chemical bath to prevent parasites and bacteria from spreading to the rest of the flock.
- There is an open source project, last updated 2014 and there is another one on Github. Then there is another open source one for the Raspberry Pi although I can’t figure out how it works since it doesn’t seem to be using a virus/malware scanner.
- Commercial solutions are there are as well.
- OPSWAT (metadefender before). This is a solution (software or a kiosk) where you can even have it scanned by an x number of virusscan engines
- .Symantec (before Norman Shark, then BlueCoat before Symantec bought Bluecoat) has a solution which cryptographically signs the USB stick after scanning it in order to allow it in a workstation.This is the only one that uses a sandboxing technique.
IMHO virus scanning is not enoug. You need some kind of sandboxing technique. After all a virus scanner would not have stopped Stuxnet.
Or would it? Anyone knows of any other Sheep dip solution that uses Sandboxing? Perhaps some home brewed solution with Cuckoo?
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The picture is from the Farmers Weekly. © Jeff J Mitchell/Getty Images