Alperovitch said that McAfee had notified all 72 victims of the attacks, which are under investigation by law enforcement agencies around the world. He declined to give more details.
Jim Lewis, a cyber expert with the Center for Strategic and International Studies, said it was very likely China was behind the campaign because some of the targets had information that would be of particular interest to Beijing.
The systems of the IOC and several national Olympic Committees were breached before the 2008 Beijing Games. And China views Taiwan as a renegade province, and political issues between them remain contentious even as economic ties have strengthened in recent years.
"Everything points to China. It could be the Russians, but there is more that points to China than Russia," Lewis said.
McAfee, acquired by Intel Corp this year, would not comment on whether China was responsible.