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Configuring Wazuh Engine to Block Country IP Addresses

When dealing with logs, it's crucial to have a solid understanding of how the Wazuh engine reacts to them. In this article, we'll explore how to modify the stock pfSense rule ID 87700 by adding specific lines at the end of the file `/var/ossec/rules/local_rules.xml` and `local_decoder.xml`. This will enable us to decode logs and trigger alerts accordingly.

Before diving into the configuration process, let's take a step back and understand the importance of decoders in Wazuh. Without decoders, we won't be able to trigger alerts, making it essential to prepare a decoder for our log format. In this case, we'll use the `logtest-legacy` tool to decode the log.

To do so, we need to modify the stock rule ID 87700 by adding specific lines at the end of the file `/var/ossec/rules/local_rules.xml`. This will enable us to specify the rules and conditions for triggering an alert. The decoder stage is also crucial, where we can have full control over decoding the log accordingly.

Additionally, it's essential to understand the three phases in the `logtest` tool: Phase 1 (pre-decoder), Phase 2 (decoder), and Phase 3 (rules). In our case, we'll focus on Phases 2 and 3 to ensure that our logs are decoded and triggered correctly.

In Phase 2, we can have full control over decoding the log by specifying the relevant fields. For instance, in the log line mentioned above, we can identify the relevant fields and configure them accordingly.

Unfortunately, as of Wazuh v4.1.0, the binary for `logtest-legacy` is deprecated. However, this doesn't mean that we can't process logs similar to the ones mentioned above. We'll need to rely on the standard pfSense decoder/rules to achieve this.

In conclusion, configuring the Wazuh engine to block country IP addresses requires a thorough understanding of decoders and rules. By following the steps outlined in this article, you'll be able to modify the stock rule ID 87700 and prepare a decoder for your log format. This will enable you to trigger alerts correctly and maintain a secure network environment.

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