Custom Malware Signature database allows you to customize the URLs that need to be detected and protected against the malware, as shown in the figure below.

On the Custom Malware Signature tab, click Add. Then, the Add Signature dialog box appears, as shown below.

Rule ID: Custom rule ID.

Rule Name, Description, and Impacts can be customized based on the situation.

Threat Level: The available three levels (High, Medium, and Low) define the severity of the rule.

Status: Two types are provided, including Enabled. Block if attack detected and Disable.

Domain/URL: Define the domain name/URL that the rule needs to match.