Monitoring critical Windows security events is a core part of a healthy information security program. Configuring your systems and network appropriately is just the start—without consistent Windows event log monitoring, you can miss early signs of account compromise, privilege escalation, and malicious activity.
This article outlines 11 Windows security events you should monitor to detect threats faster and reduce risk across your environment.
Why Monitoring Windows Security Events Matters
Monitoring Windows security events helps organizations detect suspicious activity such as unauthorized access, privilege escalation, and malware execution. It also supports compliance requirements and strengthens incident response by providing visibility into what’s happening across your environment. Without proper monitoring, critical warning signs can go unnoticed until it’s too late.
Top 11 Windows Events You Should Monitor
Here’s our list of the top 11 Windows events you should monitor. This list is not exhaustive, but it provides a starting point from which you can identify the most potentially-threatening behaviors on your network.
1. User Rights Changes
You want to know when users are added, deleted, or if their access rights change. Most of the time, these events will be standard procedure. However, if malicious users make it into your network, they’ll want to gain as much access as possible—meaning that it’s likely they will try to alter account settings. This type of activity can indicate privilege escalation or unauthorized access attempts.
2. Group Settings
Active Directory groups are used to manage access rights, so, if any settings related to groups change, it could be an indicator that a malicious user has infiltrated your network and is attempting to join a privileged user group or even remove employees from that privileged group. Pay close attention to changes involving privileged groups like Domain Admins or local administrators.
3. Account Lockouts
Generally, account lockouts mean a user has simply forgotten his or her password or mistyped it. However, it could also indicate that a threat agent is attempting a brute force attack on a user’s account. Repeated lockouts may indicate brute force attacks, password spraying, or credential stuffing attempts.
4. Event Log Clearing
Event logs are what you use to keep track of what’s occurring on your network. It’s where all the events on this list will be logged. You’ll be required to retain these logs for a set period of time for most compliance frameworks, so deletion of them is often an indication of a threat agent trying to cover their tracks. This is often associated with attacker anti-forensics or attempts to hide malicious activity.
5. Firewall Rule Changes
Your firewalls exist to keep malicious traffic out of your network. So, when firewall rules change, whether they’re deleted or modified, it’s a cause for concern. A change to firewall rules could mean a malicious user has made it into your network and is attempting to apply firewall settings that allow other malicious traffic to enter the network more easily. Unexpected changes may indicate unauthorized access or attempts to weaken network defenses.
6. Failure to Load Group Policy
Remember, Group Policy is what defines access rights for users on your network. So, if it fails to load, user access rights will be out-of-sync with what they should be. This means unprivileged accounts could perform privileged actions, potentially giving hackers on unprivileged accounts more power than the account would normally have. This can create security gaps where users gain unintended access or controls fail to apply properly.
7. New Software Installation
One of the more damaging things a malicious user can do to your network is install malware, the effects of which can be highly inconvenient to extremely devastating — especially in the case of ransomware. Monitoring the installation of software on your network will give you visibility into what’s being installed on your network, so you can determine whether the installation is part of normal business operations or if it’s a cause for concern. This could signal malware installation, ransomware activity, or unauthorized software deployment.
8. New Device Attachment
A new device on your network is generally part of onboarding procedures for a new employee or addition of approved new technology. But, if an unrecognized device is attached to your system, you’ll want to know about it as quickly as possible. Maintaining logs on these events can cue you in to whether the device is an expected part of business operations or something that should be investigated further.
In addition to obtaining these logs from your systems, it’s also imperative to review them regularly. Logs are records of information, and without review and interpretation of those records, they can’t help you maintain network security. Unknown devices may indicate unauthorized access points or potential insider threats.
9. New Processes or Services Created
This event indicates whether a program was ran or if software was installed on one of your network’s systems. These are generally common business practices. However, if you begin to suspect malicious behavior on your network or systems, these logs will help indicate the nature and location of the behavior. When you set this up, be sure to enable command line auditing. Monitoring this helps detect persistence mechanisms or suspicious background activity.
10. PowerShell Logging
PowerShell is a Windows command environment that allows users to execute programs. In the past, PowerShell didn’t have many logging capabilities. If an attacker executed commands from PowerShell, system administrators were often left with few clues as to what had happened.
However, newer versions of PowerShell allow much more visibility into the command environment, producing logs that show script block logging, module logging, transcription logging, and more. Keeping logs of the activities within PowerShell can give you visibility into command activities performed by authorized users and threat agents alike. PowerShell is commonly used in living-off-the-land attacks and script-based exploitation.
11. User Login/Authentication Events
By monitoring user login/authentication events (successes and failures), you’ll be able to determine which users were active at specific times. This might not be imperative in daily business practices, but, in the event of a breach, being able to know which users were active is highly valuable. These logs help identify suspicious login behavior, unauthorized access, or compromised credentials.
How to Prioritize Windows Event Monitoring
Start by focusing on high-risk events like authentication failures, privilege changes, and PowerShell activity. From there, refine your monitoring strategy to reduce noise and ensure alerts are actionable.
While the 11 events identified here are the big puzzle pieces you should pay attention to, there are other, more subtle, events that can go unnoticed without an eye for detail.
LBMC can help you identify the most critical Windows security events for your environment, configure effective logging and alerting, and validate that your monitoring detects real-world threats.
Contact us to learn how our Purple Team can assess your logging strategy and help strengthen your security posture.
Content provided by LBMC professional, Bill Dean.
Windows Event Monitoring FAQs
What are Windows security events?
Windows security events are system-generated logs that record activities like user logins, account changes, and system access. These logs help organizations detect suspicious behavior, investigate incidents, and maintain visibility into security-related activity across their environment.
Why is it important to monitor Windows event logs?
Monitoring Windows event logs is important because it helps detect threats such as unauthorized access, privilege escalation, and malware activity. Without consistent monitoring, organizations may miss early indicators of a security breach or ongoing attack.
Which Windows security events should you monitor?
The most important Windows security events to monitor include login and authentication events, user rights changes, group membership changes, PowerShell activity, and event log clearing. These events provide visibility into high-risk activity and potential security threats.
How often should Windows security events be monitored?
Windows security events should be monitored continuously using automated tools such as SIEM or EDR solutions. Real-time monitoring allows organizations to detect and respond to suspicious activity quickly, reducing the risk of a successful attack.
What tools are used to monitor Windows event logs?
Common tools used to monitor Windows event logs include SIEM platforms, endpoint detection and response (EDR) tools, and centralized logging systems. These tools collect, analyze, and alert on suspicious activity across systems and networks.
