France Probes ‘Foreign Interference’ After Remote Control Malware Found on Passenger Ferry

France’s counterespionage agency is investigating a suspected cyberattack plot targeting an international passenger ferry, authorities said Wednesday.

A Latvian crew member is in custody facing charges of having acted for an unidentified foreign power, French officials said. But Interior Minister Laurent Nunez appeared to hint that Russia is suspected, saying: “At the moment, foreign interference very often comes from same country.”

France and other European allies of Ukraine allege that Russia is waging “hybrid warfare” against them, using sabotage, assassinations, cyberattacks, disinformation and other hostile acts that are often hard to quickly trace back to Moscow.

Intelligence shared by Italian authorities tipped off the General Directorate of Internal Security — France’s special counterespionage and counterterror intelligence service — that software sometimes used by cybercriminals may have infected computer systems aboard a ferry docked in the French Mediterranean port of Sète, the Paris prosecutor’s office said.

The so-called RAT software ...