Chinese and Iranian hackers: The latest challenge for US companies

Businesses and government agencies in the United States have been targeted in aggressive attacks by Iranian and Chinese hackers who security experts believe have been energized by President Trump’s withdrawal from the Iran nuclear deal last year and his trade conflicts with China.

Recent Iranian attacks on American banks, businesses and government agencies have been more extensive than previously reported. Dozens of corporations and multiple United States agencies have been hit, according to seven people briefed on the episodes who were not authorized to discuss them publicly.

The attacks, attributed to Iran by analysts at the National Security Agency and