Jim Arrigo woke up on a Monday morning and tried to log into the email network for his family's dealership group in South Florida.

He was locked out, and he didn't know why.

The call he placed next to his information technology staff would uncover a chain of events that effectively halted business for up to three days at the five-store group, brought in the FBI and has cost Arrigo more than $250,000 — and counting — to rebuild the company's computer network.