Virus Attacks

Virus Attacks

There are two ways a virus could enter your system from the Internet: from a file that has been uploaded from a remote client or as an attachment within an electronic mail message.

To prevent an infected file being uploaded, you have to be very strict with the server applications that can be used on your server. For example, to prevent users uploading a file you could stop them from using the FTP program.

A virus monitor that checks new file activity, such as the good utilities by McAfee and Dr. Soloman, should help to spot infected files as they are uploaded (see Figure 6?6). Files that have been compressed pose additional problems. It?s common to ?zip? (compress) a file. In this case, it?s very difficult for virus checkers to spot a compressed virus, but some can and it is worth ensuring that the virus software you choose supports this feature.

Figure 6?6: Virus scanners should be set to scan e-mail messages, especially newer formatted or HTML-based messages

The second entry point for a virus is through attachments to mail messages. To spot a mail message or attachment that is infected, you need to install a scanner utility program that can check mail messages and their attachments as they arrive at the mail server.

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