French authorities have opened an investigation into a cyberattack on France’s tax administration platform that affected 678,000 individual and business users. The probe, handled by Ofac (French Anti-Cybercrime Office), is examining alleged offenses including the fraudulent extraction of data from a state-run automated personal data processing system, fraudulent access to and presence in an automated data-processing system by an organized group, and participation in a criminal association formed to prepare an offense punishable by at least five years in prison. The tax administration said the breach allowed hackers to extract taxpayer and company information in an operation it described as more sophisticated than previous attacks. Compromised personal data included names, family quotient information, reference tax income and withholding tax rates, while officials said the stolen data could not be used to access secure accounts on impots.gouv.fr. Users affected by the breach are expected to be contacted from next week and warned about possible identity theft risks.