I would just like to ask if Nimda has in any way affected Unix boxes? Were there any reported Unix viruses?
The Nimda worm exploits vulnerabilities in Microsoft Internet Information Server and Internet Explorer. However, it can also cause some degradation on a Unix box as it ties up bandwidth while looking to see if that box is susceptible.
As to your second question, contrary to myths in the Unix world, there are many viruses which affect Unix. In fact, the famous research paper on computer viruses by Fred Cohen was based on Unix viruses. A quick search on any online Virus Encyclopedia should turn up enough evidence to eliminate this myth.
For more information on this topic, visit these other SearchSecurity resources:
Best Web Links: Malware
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