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When hackers struck the Colorado Department of Transportation in a ransomware attack in February and again eight days later, they disrupted the agency’s operations for weeks.

ATLANTA — Defending against cyberattacks is often a matter of returning to the basics, according to Justin Turner, director of the counterthreat unit special operations team at SecureWorks.

The cyberattack that befell FedEx Corp.’s TNT Express unit earlier this summer highlights an ever-increasing risk that many trucking fleets are up against — and which may not be insured under the typical coverages they carry, insurance industry experts say.

A global cyberattack that hit shipping behemoth A.P. Moller-Maersk is creating enormous stress at the APM Terminal in Elizabeth, N.J.