Use the following workflow to set up the default Antivirus, Anti-Spyware, and Vulnerability Protection Security Profiles.
All anti-spyware and vulnerability protection signatures have a default action defined by Palo Alto Networks. You can view the default action by navigating to Objects > Security Profiles > Anti-Spyware or Objects > Security Profiles >Vulnerability Protection and then selecting a profile. Click the Exceptions tab and then click Show all signatures and you will see a list of the signatures with the default action in the Action column. To change the default action, you must create a new profile and then create rules with a non-default action, and/or add individual signature exceptions to Exceptions in the profile.
Set up Antivirus/Anti-Spyware/Vulnerability Protection
Verify that you have a Threat Prevention license. The Threat Prevention subscription bundles the antivirus, anti-spyware, and the vulnerability protection features in one license. To verify that you have an active Threat Prevention subscription, select Device > Licenses to verify that the Threat Prevention license is installed and check the expiration date.
Download the latest antivirus threat signatures. Select Device > Dynamic Updates and click Check Now at the bottom of the page to retrieve the latest signatures. In the Actions column, click Download to install the latest Antivirus and Applications and Threats signatures.
Schedule signature updates. From Device > Dynamic Updates, click the text to the right of Schedule to automatically retrieve signature updates for Antivirus and Applications and Threats. Specify the frequency and timing for the updates and whether the update will be downloaded and installed or only downloaded. If you select Download Only, you would need to manually go in and click the Install link in the Action column to install the signature. When you click OK, the update is scheduled. No commit is required. (Optional) You can also enter the number of hours in the Threshold field to indicate the minimum age of a signature before a download will occur. For example, if you entered 10, the signature must be at least 10 hours old before it will be downloaded, regardless of the schedule. In an HA configuration, you can also click the Sync To Peer option to synchronize the content update with the HA peer after download/install. This will not push the schedule settings to the peer firewall; you need to configure the schedule on each firewall.
Best Practices for Antivirus Schedules The general recommendation for antivirus signature update schedules is to perform a download-and-install on a daily basis for antivirus and weekly for applications and vulnerabilities. Recommendations for HA Configurations: Active/Passive HA —If the MGT port is used for antivirus signature downloads, you should configure a schedule on both firewalls and both firewalls will download/install independently. If you are using a data port for downloads, the passive firewall will not perform downloads while it is in the passive state. In this case you would set a schedule on both firewalls and then select the Sync To Peer option. This will ensure that whichever firewall is active, the updates will occur and will then push to the passive firewall. Active/Active HA —If the MGT port is used for antivirus signature downloads on both firewalls, then schedule the download/install on both firewalls, but do not select the Sync To Peer option. If you are using a data port, schedule the signature downloads on both firewalls and select Sync To Peer. This will ensure that if one firewall in the active/active configuration goes into the active-secondary state, the active firewall will download/install the signature and will then push it to the active-secondary firewall.
Attach the security profiles to a Security policy rule. Select Policies > Security, select the desired policy to modify it and then click the Actions tab. In Profile Settings, click the drop-down next to each security profile you would like to enable. In this example we choose default for Antivirus, Vulnerability Protection, and Anti-Spyware. The default Anti-Spyware rule enables DNS Sinkholing. If no security profiles have been previously defined, select Profiles from the Profile Type drop-down. You will then see the list of options to select the security profiles.
Save the configuration. Click Commit.

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