Objects > Security Profiles > Antivirus
Antivirus Profilespage to configure options to have the firewall scan for viruses on the defined traffic. Set the applications that should be inspected for viruses and the action to take when a virus is detected. The default profile inspects all of the listed protocol decoders for viruses, generates alerts for Simple Mail Transport Protocol (SMTP), Internet Message Access Protocol (IMAP), and Post Office Protocol Version 3 (POP3), and takes the default action for other applications (alert or deny), depending on the type of virus detected. The profile will then be attached to a Security policy rule to determine the traffic traversing specific zones that will be inspected.
Customized profiles can be used to minimize antivirus inspection for traffic between trusted security zones, and to maximize the inspection of traffic received from untrusted zones, such as the Internet, as well as the traffic sent to highly sensitive destinations, such as server farms.
To add a new Antivirus profile, select Add and enter the following settings:
Enter a profile name (up to 31 characters). This name appears in the list of antivirus profiles when defining security policies. The name is case-sensitive and must be unique. Use only letters, numbers, spaces, hyphens, periods, and underscores.
Enter a description for the profile (up to 255 characters).
Select this option if you want the profile to be available to:
Disable override (
Select this option to prevent administrators from overriding the settings of this Antivirus profile in device groups that inherit the profile. This selection is cleared by default, which means administrators can override the settings for any device group that inherits the profile.
The Antivirus tab allows you to specify the action for the different types of traffic, such as ftp, and http.
Select this option if you want to capture identified packets.
Decoders and Actions
For each type of traffic that you want to inspect for viruses, select an action from the drop-down. You can define different actions for standard antivirus signatures (Action column) and signatures generated by the WildFire system (WildFire Action column).
Some environments may have requirements for a longer soak time for antivirus signatures, so this option enables the ability to set different actions for the two antivirus signature types provided by Palo Alto Networks. For example, the standard antivirus signatures go through a longer soak period before being released (24 hours), versus WildFire signatures, which can be generated and released within 15 minutes after a threat is detected. Because of this, you may want to choose the alert action on WildFire signatures instead of blocking.
For the best security, clone the default Antivirus profile and set the Action and WildFire Action for all the decoders to
reset-bothand attach the profile to all Security policy rules that allow traffic.
Applications Exceptions and Actions
Applications Exceptiontable allows you to define applications that will not be inspected. For example, to block all HTTP traffic except for a specific application, you can define an antivirus profile for which the application is an exception.
Blockis the action for the HTTP decoder, and
Allowis the exception for the application. For each application exception, select the action to be taken when the threat is detected. For a list of actions, see Actions in Security Profiles.
To find an application, start typing the application name in the text box. A matching list of applications is displayed, and you can make a selection.
If you believe a legitimate application is incorrectly identified as carrying a virus (false positive), open a support case with TAC so Palo Alto Networks can analyze and fix the incorrectly identified virus. When the issue is resolved, remove the exception from the profile.
Virus Exceptionstab to define a list of threats that will be ignored by the antivirus profile.
Only create a virus exception if you are sure an identified virus is not a threat (false positive). If you believe you have discovered a false positive, open a support case with TAC so Palo Alto Networks can analyze and fix the incorrectly identified virus signature. When the issue is resolved, remove the exception from the profile immediately.