Hackers are taking a page from the open-source playbook, using the same techniques that made Linux and Apache successes to improve their malicious software, according to McAfee Inc.

Nowhere is this more apparent than within the growing families of "bot" software, which allow hackers to remotely control infected computers. Unlike viruses of the past, bots tend to be written by a group of authors, who often collaborate by using the same tools and techniques as open source developers, said Dave Marcus, security research and communications manager with McAfee's Avert Labs.

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