By Bruno Abreu — Information Systems graduate, transitioning to Cybersecurity and SOC.
Public lab of practical cybersecurity studies covering Linux, networks, SOC, logs, firewall, and information security.
This site documents my transition to cybersecurity through hands-on labs, technical studies, and real learning records. The goal is to turn theory into practice and build a solid foundation to work in Information Security and SOC.
Controlled environment for practicing cybersecurity fundamentals.
Remote access setup between MacBook and Ubuntu via OpenSSH. Concepts of IP, ports, SSH service, and connectivity diagnostics.
Configuration and understanding of the UFW firewall on Ubuntu. Inbound and outbound rules, port opening, and access control best practices.
Analysis of SSH authentication logs on Linux. Understanding login events, failures, source IPs, and the importance of logs for SOC.
Using Nmap to identify open ports and exposed services on local network machines.
Packet capture and analysis on a local network. Observing protocols such as ICMP, DNS, and TCP.
Basic installation and configuration of Wazuh as a SIEM for security event monitoring.
Neste laboratório, usei o Nmap para identificar portas abertas em um servidor Linux, investiguei os serviços expostos com lsof e relacionei as portas encontradas com containers Docker em execução.
Neste laboratório, usei o Wireshark para capturar e analisar tráfego de rede entre meu MacBook e um servidor Linux, observando pacotes ICMP, conexão SSH, TCP handshake e tráfego gerado por um scan Nmap.
Neste laboratório, analisei logs de autenticação SSH no Ubuntu usando journalctl, identificando login bem-sucedido, abertura e encerramento de sessão, tentativa com senha incorreta e IP de origem da conexão.
This lab documents my practical evolution in cybersecurity. The goal is to demonstrate progressive mastery of fundamentals such as Linux, networks, SSH, firewall, logs, event analysis, security tools, and SOC concepts.
Each article records the objective, environment, problem, diagnosis, solution, and learning. This is not a news blog — it is a technical record of real studies.