Update Security Rules

With all the information you have now uncovered, you can sketch together how the threat impacts your network—the scale of the attack, the source, the compromised hosts, the risk factor—and evaluate what changes, if any, to follow through. Here are some suggestions to consider:
  • Forestall DDoS attacks by enhancing your DoS Protection profile to configure random early drop or to drop SYN cookies for TCP floods. Consider placing limits on ICMP and UDP traffic. Evaluate the options available to you based on the trends and patterns you noticed in your logs, and implement the changes using Panorama templates.
    Create a dynamic block list (
    Dynamic Block Lists
    ), to block specific IP addresses that you have uncovered from several intelligence sources: analysis of your own threat logs, DDoS attacks from specific IP addresses, or a third-party IP block list.
    The list must be a text file that is located on a web server. Using device groups on Panorama, push the object to the managed firewalls so that the firewalls can access the web server and import the list at a defined frequency. After creating a dynamic block list object, define a Security rule that uses the address object in the source and destination fields to block traffic from or to the IP address, range, or subnet defined. This approach allows you to block intruders until you resolve the issue and make larger policy changes to secure your network.
  • Determine whether to create shared policy rules or device group rules to block specific applications that caused the infection (web-browsing, SMTP, FTP), make more stringent URL Filtering rules, or restrict some applications/actions (for example, file downloads to specific user groups).
  • On Panorama, you can also switch to the firewall context and configure the firewall for Botnet reports that identify potential botnet-infected hosts on the network.

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