WhatsApp on Tuesday sued Israeli technology firm NSO Group, accusing it of using the Facebook-owned messaging service to conduct cyberespionage on journalists, human rights activists and others.
The suit filed in a California federal court contended that NSO Group tried to infect approximately 1,400 "target devices" with malicious software to steal valuable information from those using the messaging app.
WhatsApp head Will Cathcart said the lawsuit was filed after an investigation showed the Israeli firm's role in the cyberattack, despite its denials.
"NSO Group claims they responsibly serve governments, but we found more than 100 human rights defenders and journalists targeted in an attack last May. This abuse must be stopped," Cathcart said on Twitter.
The suit calls on the court to order NSO Group to stop any such attacks and asks for unspecified damages.