It takes less than five minutes for hackers to find and compromise an unpatched Windows PC after it's connected to the Internet, a security researcher said today.

The SANS Institute's Internet Storm Center (ISC) currently estimates the “survival” time of an Internet-connected computer running Windows at around four minutes if it's not equipped with the latest Microsoft security patches, said Lorna Hutcheson, a researcher and analyst, in a post to the ISC blog.

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