The specific identification of Nic Gabunada, former chief executive of Omnicom Media Group Philippines, marks a departure for Facebook in its efforts against "coordinated inauthentic behavior."

A Citizen Lab researcher, Bill Marczak, was also targeted during the course of the investigation.

Sensitive Philippine government documents acquired by a hacker group with suspected ties to the Vietnamese government have been floating on the public internet, according to evidence gathered by CyberScoop.