The unit of Japanese conglomerate Toshiba Corp said in a statement that only a minimal amount of work data was lost during the cyberattack and no leaks of data had been detected. It said it had put protective measures in place immediately after the attack.
Toshiba Tec France Imaging System also said its teams remained mobilised to deal with the situation.
Other French companies hit by cyberattacks this year include champagne company Laurent Perrier, boat maker Beneteau, and camping and van equipment maker Trigano.
(Reporting by Benoit Van Overstraeten, Sudip Kar-Gupta and Nicolas Delame; editing by Carmel Crimmins)