More than 600,000 Mac computers were affected by a hacking attack, a sign that the once rarely targeted company is becoming a bigger focus for people intent on spreading malware, a security-research firm said.
The attack affects computers running Apple's Mac OS X software, according to Russian antivirus software maker Doctor Web. Most of the infected computers are in the United States and Canada, the firm said in a blog posting. Apple fixed a security hole this week that let the malicious software spread. Users who haven't downloaded the necessary updates are vulnerable, Doctor Web said.

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