Kaspersky, a cybersecurity firm, said this week it uncovered the campaign and that the malware was so sophisticated it must have been created by a government.

Andre Marty, a spokesman for Swiss federal prosecutors, said Thursday that Switzerland’s investigation is directed against persons unknown and was opened following a report from the Swiss intelligence agency. He said in an emailed response that a search took place in Geneva on May 12 during which unspecified information technology material was seized.

Most of the Iran talks over recent months have taken place inSwitzerland and Austria.