The attack, which affected approximately 90 people, was carried out using spyware from the Israeli company Paragon Solutions.
Experts believe the attack exploited a "zero-click" vulnerability, which allows spyware to install itself on a device without any user interaction.
The malicious code was likely distributed via a specially crafted PDF file sent to users added to WhatsApp groups.
Zero-click terror: израильские шпионы взломали WhatsApp без единого клика
Шпионское ПО атаковало 90 человек.