Apple blocks ad-injecting Mac trojan, Yontoo

Don't lift a finger: Yontoo has been added to OS X's built-in protections. by Jacqui Cheng - Mar 22, 2013 9:17 pm UTC. OS X · 0. A day after Russian anti-virus firm Doctor Web highlighted an adware Mac trojan called "Yontoo," Apple has moved to block it.