Apple is developing a tool to "detect and remove" a Trojan that is believed to have infected around 650,000 Macintosh computers.
It said it is working with internet service providers (ISPs) to disrupt the command network being used by hackers to exploit the malware.
Trojans are infections that can expose computers to control by hackers.
It is Apple's first statement on the threat. It issued patches to prevent the malware's installation last week.
The two security updates were released ===> eight weeks after Java's developer Oracle issued a fix for other computer systems. <===