Taco Cowboy writes "Two of the networks in the company I work for have been zombified by different botnets. They are taken off the grid as we speak. We thought we had taken precautions against infection, such as firewall and anti-viral programs, but for some reasons we have failed. Is there any list of precautionary steps available?" I'd suggest port blocking 80 for any computer that is detected running a web browser, but that might prevent some percentage of legitimate work.
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