Apple on Tuesday said it was hit by hackers who wormed their way into the California company's system but evidently failed to steal any data.
The maker of iPhones, iPads, iPods, and Macintosh computers said it is working with law enforcement officials to hunt down the hackers, who appeared tied to a series of recent cyber attacks on US technology firms.
"The malware was employed in an attack against Apple and other companies, and was spread through a website for software developers," Apple said in an email response to an AFP inquiry.
"We identified a small number of systems within Apple that were infected and isolated them from our network."
The malicious software, or malware, took advantage of vulnerability in a Java prorgram used as a "plug-in" for Web browsing programs.
A "small number" of computer systems at Apple were infected but they were isolated from the main network, according the Silicon Valley based company.
"There is no evidence that any data left Apple," Apple said. "We are working closely with law enforcement to find the source of the malware."
Apple took the added steps of releasing a Macintosh computer operating system update that disables Java software that hasn't been used for 35 days or longer and a tool for finding and removing the malware.