Major firms are joining ranks against NSO.

“The shift towards zero-click attacks by an industry and customers already steeped in secrecy increases the likelihood of abuse going undetected,” the researchers said.

Circles exploits mobile phone vulnerabilities via a hard-to-detect bit of surveillance, according to Citizen Lab.

Religious and political opposition leaders in Togo were targeted last year with spyware developed by NSO Group, according to Citizen Lab.

It's a major blow to Israeli software surveillance company NSO Group.

The ruling comes despite allegations that NSO's software has been used against human rights activists.