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TL;DR

Wazuh centralizes security monitoring by combining agent-collected data into a single dashboard for Linux and Windows.

Briefing Cornell Notes

Briefing

A free, open-source security platform called Wazuh (NetworkChuck calls it “waza”) is positioned as a practical way to both learn defensive cybersecurity and actively protect systems. After deploying a central server and installing lightweight agents on endpoints, Wazuh continuously checks for misconfigurations, known vulnerabilities, malware indicators, and suspicious activity—then funnels everything into one dashboard with alerts and automated “active response” actions. The core payoff is twofold: visibility across Linux and Windows machines, and the ability to respond to threats automatically (for example, blocking an attacking IP after brute-force attempts).

Deployment is described as fast and flexible. The setup can run on a Linux server, on-prem hardware, inside Docker, or via a virtual machine image. For the Wazuh server, the minimum guidance is 2 GB RAM and 2 CPU cores, while heavier log collection calls for 4 GB RAM and 8 CPU cores. The walkthrough then focuses on spinning up a cloud VM (using Linode) from a marketplace listing for Wazuh, selecting an Ubuntu image, configuring SSL and an admin user, and choosing a plan size—explicitly noting that the 4 GB option is required for the standard installation to work. Once the VM is ready, the process retrieves admin credentials from a deployment secrets file, logs into the Wazuh web interface via the VM’s reverse DNS name, and confirms the manager is operational.

With the server running, the next step is installing agents on monitored machines. The transcript shows adding a Linux agent (Ubuntu) and a Windows agent (Windows 7 or greater), using a one-command installer on each host and then enabling the agent as a service. After agents connect, the dashboard becomes the control center: it highlights MITRE ATT&CK mappings for observed or potential tactics, compliance checks against common frameworks (including references to PCI, GDPR, NIST, and HIPAA), and secure configuration assessment using CIS benchmarks for Ubuntu. A key “wow” feature is integrity monitoring on Windows, which tracks changes to important files and registry keys—down to events like registry key additions, deletions, and modifications.

Beyond detection, the transcript demonstrates active response. A brute-force attempt against a Linux host is detected as a security event tied to a specific rule ID. Then an active response rule is edited so that when that rule triggers, Wazuh runs a firewall drop command for 180 seconds. The result is immediate: repeated login attempts get blocked, and even basic connectivity checks fail until the timeout expires.

Finally, the walkthrough expands coverage by enabling vulnerability detection (disabled by default) and configuring scheduled scans. It also shows how to route alerts to Slack using an incoming webhook, with the option to limit alerts by severity or specific rule IDs. The overall message is that Wazuh can be deployed at low cost (hosting only), provides hands-on learning for blue-team workflows, and turns security monitoring into an actionable system rather than a passive log viewer.

Cornell Notes

Wazuh is presented as a free, open-source security information and event management (SIEM) platform that centralizes monitoring for Linux and Windows using agents. After deploying a Wazuh server and installing agents, the dashboard surfaces security events (like authentication failures), secure configuration assessment (CIS-based checks), integrity monitoring (including Windows registry/file changes), and MITRE ATT&CK context. The platform can also take action: active response can automatically block an IP when a brute-force rule triggers. Vulnerability scanning is disabled by default in the manager and must be enabled, then runs scheduled scans. Alerts can be delivered via email or Slack using integrations such as Slack incoming webhooks.

What does Wazuh provide after agents are installed, and how does it differ from simple log viewing?

Wazuh collects host data from installed agents and consolidates it into one dashboard. It doesn’t just display raw logs; it adds security-focused modules such as security events (e.g., authentication failures that can indicate brute force), secure configuration assessment using CIS benchmarks, and integrity monitoring that tracks file and registry changes—especially detailed on Windows. It also maps activity to the MITRE ATT&CK framework and can generate alerts that feed into automated responses.

How does secure configuration assessment work in the walkthrough?

The transcript highlights a module that performs CIS-based checks for Ubuntu. It reports a security configuration score and lists specific failures, such as recommendations to disable USB storage, adjust SSH settings (e.g., root login), and avoid unnecessary services (like Telenet). Each finding includes rationale and remediation guidance, and the output also ties misconfigurations to relevant MITRE techniques.

What makes Windows integrity monitoring stand out?

On Windows agents, integrity monitoring watches important files and registry keys that are commonly modified during compromise. The walkthrough shows events like registry key deletion and firewall policy changes, plus inventory views of monitored registry keys and files. It also demonstrates real-time alerts by editing the agent configuration to enable real-time monitoring and change reporting, then creating/modifying files and observing corresponding alerts.

How does active response turn detection into automated defense?

Active response is configured on the Wazuh manager. The walkthrough ties an active response action (a firewall drop command) to a specific rule ID associated with a brute-force attempt. After editing the active response configuration and restarting the manager, a new brute-force attempt triggers the rule and the firewall blocks the attacker’s IP for 180 seconds—preventing even basic access during the timeout.

Why is vulnerability scanning not immediately visible, and how is it enabled?

Vulnerability detection isn’t enabled by default in the Wazuh manager, so the vulnerabilities module may show nothing initially. The transcript instructs enabling the vulnerability detector in the manager configuration, then restarting the manager and services so scheduled scans can run. After scanning, the dashboard lists vulnerabilities (including severity levels) for hosts with installed applications.

How are Slack alerts configured in the walkthrough?

Slack alerts are set up by creating a Slack app and enabling an incoming webhook, then selecting a channel (e.g., a dedicated “Wazuh Alerts” channel). The webhook URL is pasted into Wazuh’s integration configuration. To avoid alert overload, the configuration can be adjusted to send alerts only for certain severities or specific rule IDs (such as the same brute-force rule used for active response).

Review Questions

What modules in Wazuh help with (1) detecting suspicious activity, (2) checking configuration against benchmarks, and (3) monitoring integrity on Windows?
Describe the steps needed to make active response block an attacker after a brute-force rule triggers.
Why must vulnerability scanning be enabled on the Wazuh manager, and what changes after it’s turned on?

Key Points

1
Wazuh centralizes security monitoring by combining agent-collected data into a single dashboard for Linux and Windows.
2
Secure configuration assessment uses CIS-style checks (shown for Ubuntu) and provides both findings and remediation guidance.
3
Windows integrity monitoring can track file changes and registry key modifications, including real-time alerts when configured.
4
Active response can automatically execute defensive actions (like firewall drops) when specific rule IDs trigger.
5
Vulnerability detection is disabled by default on the manager and must be enabled to populate the vulnerabilities view.
6
Slack alerts are implemented via Slack incoming webhooks and can be filtered by severity or rule ID to reduce noise.
7
Deployment can run on a cloud VM, on-prem server, or Docker, with the walkthrough emphasizing correct server sizing (notably selecting the 4 GB plan for the standard install).

Highlights

Wazuh’s integrity monitoring can track Windows registry changes and generate alerts when keys are added, deleted, or modified.

Active response connects detection to action: a brute-force rule triggers a firewall drop that blocks the attacker for a timed window.

Secure configuration assessment ties misconfigurations to CIS benchmarks and links them to MITRE ATT&CK techniques.

Vulnerability scanning requires explicit enabling on the Wazuh manager; otherwise the vulnerabilities module stays empty.

Slack alerting is done through an incoming webhook and can be narrowed to specific rule IDs.

Topics

Wazuh Deployment
Agent Installation
Integrity Monitoring
Active Response
Vulnerability Scanning
Slack Alerts

Mentioned

Linode
SIEM
CIS
MITRE
SCA
CVE
IP
SSL
FQDN
OSSEC