Fortinet Document Library

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Table of Contents

Administration Guide

URL Scan Flow

After a URL is received from an input source, it goes through the following steps before a verdict is reached. If a verdict can be reached at any step, the scan will stop.

  1. Static Scan

    In this step, the URL is checked against the user uploaded allowlist/blocklist White/Black list and the Overridden Verdicts list.

  2. Sandboxing Scan

    If WEBLink is associated with a VM type as defined in the Scan Profile page > VM Association tab, the URL will be scanned inside a clone of that VM type. If the URL type is enabled with the sandboxing pre-filtering command, only URLs whose webfiltering category is UNRATED will be scanned inside a VM. For more information, please refer to the FortiSandbox CLI Guide, for the sandboxing-prefiltering command.

During the Static Scan step, URLs will be checked against the user uploaded allow (white) list and block (black) list in this order, and rated as Clean or Malicious respectively: URL REGEX black list > URL black list > Domain black list > URL REGEX white list > URL white List > Domain white list. For example, if users enter *.microsoft.com in the domain allowlist and http://www.microsoft.com/.*abc/bad.html in the URL blocklist, URL http://www.microsoft.com/1abc/bad.html will be rated as Malicious.

URL Scan Flow

After a URL is received from an input source, it goes through the following steps before a verdict is reached. If a verdict can be reached at any step, the scan will stop.

  1. Static Scan

    In this step, the URL is checked against the user uploaded allowlist/blocklist White/Black list and the Overridden Verdicts list.

  2. Sandboxing Scan

    If WEBLink is associated with a VM type as defined in the Scan Profile page > VM Association tab, the URL will be scanned inside a clone of that VM type. If the URL type is enabled with the sandboxing pre-filtering command, only URLs whose webfiltering category is UNRATED will be scanned inside a VM. For more information, please refer to the FortiSandbox CLI Guide, for the sandboxing-prefiltering command.

During the Static Scan step, URLs will be checked against the user uploaded allow (white) list and block (black) list in this order, and rated as Clean or Malicious respectively: URL REGEX black list > URL black list > Domain black list > URL REGEX white list > URL white List > Domain white list. For example, if users enter *.microsoft.com in the domain allowlist and http://www.microsoft.com/.*abc/bad.html in the URL blocklist, URL http://www.microsoft.com/1abc/bad.html will be rated as Malicious.