Windows powers approximately 85–90% of enterprise environments worldwide. That makes it the most heavily attacked operating system on the planet — and also the most thoroughly logged.
Microsoft has spent years building comprehensive audit trails into Windows. Patch Tuesday (when Microsoft releases security updates) is followed almost immediately by what the industry calls “Exploit Wednesday” — the window when attackers race to weaponize newly disclosed vulnerabilities before organizations can patch. But here is what most people miss: the attacks themselves leave evidence. Everything.
Every login attempt. Every privilege assignment. Every new account. Every service installed. Every lateral move from one machine to another. Windows is recording all of it in the Security Event Log — and that log is your primary evidence source as a defender.
Active Directory is the backbone of nearly every enterprise Windows environment. It controls who can log in, what they can access, which machines they can reach, and what permissions they hold. When an attacker compromises Active Directory, they have the keys to the entire organization. When a defender understands Active Directory, they can catch an attacker at any point in that process.
Whether you end up on the offensive side as a penetration tester or on the defensive side as a SOC analyst, you need to understand what these logs say. An attacker who knows the logs can try to cover their tracks. A defender who knows the logs will find them anyway.
This module covers both sides.
📁 Free handout & resources: Download the Module 11 PDF — reference tables, Event ID cheat sheet, lab guides.
Learning Objective
After this lesson, you can explain why Active Directory is a high-value target, what the Security Event Log is, and why understanding logs matters for both offensive and defensive roles.
Try It Now
Open Event Viewer on your Windows machine:
- Press Windows key, search “Event Viewer,” open it
- Expand Windows Logs → Security
- Scroll through and look at a few events — don’t worry about understanding them yet
You will understand every one of these by the end of Module 11.
Part of the free Intro to Cyber course by Cover6 Solutions.