"A State Department spokesperson declined to comment on the intrusions, instead pointing to the Commerce Department's recent decision to place the Israeli company on an entity list, making it harder for U.S. companies to do business with them.

NSO Group and another spyware firm were "added to the Entity List based on a determination that they developed and supplied spyware to foreign governments that used this tool to maliciously target government officials, journalists, businesspeople, activists, academics, and embassy workers," the Commerce Department said in an announcement last month."