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Malicious code, which is designed to probe for weaknesses and spread by
constantly attempting to infect systems, will not go away or stop its
activity once you have protected or patched your system.
The only way to stop the probes is by using something to filter them out,
at the firewall or gateway level, as you suspected. Otherwise, they will
continue to seek out weaknesses in your system and nothing you do at the
desktop level will have any impact on them.
For example, I got tired of Sircam and Yaha-infected mail coming to me. I
used a spam filter on the mail server to block incoming mail containing
subject lines which correspond to these messages. Voila, no more infected
e-mails of that type. The same idea can be applied to your case.
For more information on this topic, visit these other SearchSecurity.com resources:
Executive Security Briefing: Virus management: Never a dull moment
News & Analysis: To block, or not to block at the gateway
Virus Prevention Tip: Adding to antivirus software
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