Did this to a shipping companies package system once. All from Wi-Fi back when it was brand new and nobody used encryption. Found a desktop with write access and dropped a root virus disguised as an excel file. They ran it a week later. The virus notified me on ICQ. Found an Admin and did same to him. Then enjoyed unfettered access to the shipping software. Let's just say shit got sent all over the place. And printers were a'printing. Lots and lots of printing. Sometimes printing some very touchy emails. The good old days...
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