Intrusion 2

Rule update size and content, several minutes may pass before status messages appear. As part of the initial configuration, the system schedules daily intrusion rule updates. We recommend you review this task and make changes if necessary, as described in Schedule Intrusion Rule Updates. Importing Local Intrusion Rules A local intrusion rule is a custom standard text rule that you import from a local machine as a plain text file with ASCII or UTF-8 encoding. You can create local rules using the instructions in the Snort users manual, which is available at In a multidomain deployment, you can import local intrusion rules in any domain. You can view local intrusion rules imported in the current domain and ancestor domains. Schedule Intrusion Rule Updates As part of the initial configuration, the system schedules daily intrusion rule updates. We recommend you review this task and make changes if necessary, as described in this procedure. Before you begin Make sure your process for updating intrusion rules complies with your security policies. Consider the update's effect on traffic flow and inspection due to bandwidth constraints and Snort restarts. We recommend performing updates in a maintenance window. Make sure the FMC can access the Cisco Support & Download site. Procedure Step 1 Choose System (). Step 2 Under Recurring Rule Update Imports, check Enable Recurring Rule Update Imports. Step 3 Specify the Import Frequency and start time. Step 4 (Optional) Check Reapply all policies... to deploy after each update. Step 5 Click Save. Manually Update Intrusion Rules Use this procedure to perform an on-demand intrusion rule update. Before you begin Make sure your process for updating intrusion rules complies with your security policies. Consider the update's effect on traffic flow and inspection due to bandwidth constraints and Snort restarts. We recommend performing updates in a maintenance window. If the FMC cannot access the Cisco Support & Download site, get the update yourself: Select or search for your model (or choose any model—you use the same SRU or LSP for all FMCs), then browse to the Coverage and Content Updates page. Procedure Step 1 Choose System (). Step 2 Under One-Time Rule Update/Rules Import, choose how you want to update intrusion rules. Direct download: Choose Download new rule update.... Manual upload: Choose Rule update or text rule file..., then click Choose File and browse to the intrusion rule update. Step 3 (Optional) Check Reapply all policies...

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Model—you use the same GeoDB for all FMCs), then browse to the Coverage and Content Updates page. Download the country code package: Cisco_GEODB_Update-date-build. The IP package is for Version 7.2+. Procedure Step 1 Choose System (). Step 2 Under One-Time Geolocation Update, choose how you want to update the GeoDB. Direct download: Choose Download and install.... Manual upload: Choose Upload and install..., then click Choose File and browse to the package you downloaded earlier. Step 3 Click Import. Monitor update progress in the Message Center. Step 4 Verify update success. The GeoDB update page and Help () both show the current version. Update Intrusion Rules As new vulnerabilities become known, the Talos Intelligence Group releases intrusion rule updates. These updates affect intrusion rules, preprocessor rules, and the policies that use the rules. Intrusion rule updates are cumulative, and Cisco recommends you always import the latest update. You cannot import an intrusion rule update that either matches or predates the version of the currently installed rules. An intrusion rule update may provide the following: New and modified rules and rule states—Rule updates provide new and updated intrusion and preprocessor rules. For new rules, the rule state may be different in each system-provided intrusion policy. For example, a new rule may be enabled in the Security over Connectivity intrusion policy and disabled in the Connectivity over Security intrusion policy. Rule updates may also change the default state of existing rules, or delete existing rules entirely. New rule categories—Rule updates may include new rule categories, which are always added. Modified preprocessor and advanced settings—Rule updates may change the advanced settings in the system-provided intrusion policies and the preprocessor settings in system-provided network analysis policies. They can also update default values for the advanced preprocessing and performance options in your access control policies. New and modified variables—Rule updates may modify default values for existing default variables, but do not override your changes. New variables are always added. In a multidomain deployment, you can import local intrusion rules in any domain, but you can import intrusion rule updates from Talos in the Global domain only. Understanding When Intrusion Rule Updates Modify Policies Intrusion rule updates can affect both system-provided and custom network analysis policies, as well as all access control policies: system provided—Changes to system-provided network analysis and intrusion policies, as well as any changes to advanced access control settings, automatically take effect when you

To block abnormal behaviors and attacks within the network.1.2.3 Application-Based Intrusion Prevention Systems (AIPS)Application-Based Intrusion Prevention Systems (AIPS) focus on blocking attacks targeting specific applications, such as web applications and databases.2. Using Snort as a Host-Based Intrusion Detection SystemSnort is an open-source intrusion detection system that can analyze network traffic to detect abnormal behaviors and attacks within the network. Snort uses rules to identify suspicious traffic and takes appropriate actions based on the rules.2.1 Installing Snort for a Host-Based Intrusion Detection System“Ubuntu Host-Based Intrusion Detection System”sudo apt-get updatesudo apt-get install snortCentOSsudo yum install epel-releasesudo yum install snort2.2 Configuring Snort as a Host-Based Intrusion Detection SystemThe configuration file for Snort is located at /etc/snort/snort.conf. In this file, you can set Snort’s operating parameters and rules.Example: Configuring Snort’s Interface and Rulesinterface: eth0daq: pcap2.3 Starting Snortsudo systemctl start snort2.4 Viewing Snort LogsSnort’s log files are located at /var/log/snort/. You can review the logs to understand the suspicious traffic and attacks detected by Snort.Example: Viewing Snort Logssudo tail -f /var/log/snort/alert3. Using Suricata for Intrusion DetectionSuricata is an open-source intrusion detection and prevention system that can analyze network traffic to detect abnormal behaviors and attacks within the network. Suricata supports multiple protocols, including HTTP, TLS, and DNS.3.1 Installing Suricata“Ubuntu Host-Based Intrusion Detection System”sudo apt-get updatesudo apt-get install suricataCentOSsudo yum install epel-releasesudo yum install suricata3.2 Configuring SuricataThe configuration file for Suricata is located at /etc/suricata/suricata.yaml. In this file, you can set Suricata’s operating parameters and rules.Example: Configuring Suricata’s Interface and Rulesdefault-rule-path: /etc/suricata/rules3.3 Starting Suricatasudo systemctl start suricata3.4 Viewing Suricata LogsSuricata’s log files are located at /var/log/suricata/. You can review the logs to understand the suspicious traffic and attacks detected by Suricata.Example: Viewing Suricata Logssudo tail -f /var/log/suricata/fast.log4. Best Practices for Network Security Monitoring and Intrusion DetectionTo conduct effective network security monitoring and intrusion detection, it’s essential to follow some best practices:4.1 Regularly Update Rules and SignaturesRegularly update the intrusion detection system’s rules and signatures to keep the system up to date and capable of detecting the latest attacks.4.2 Set Reasonable Alert ThresholdsConfigure reasonable alert thresholds to reduce false positives and negatives, ensuring timely action when required.4.3