A Security Operations Center (SOC) analyst monitors systems for suspicious activity, investigates alerts and helps organizations respond to potential security incidents.
One of the most important skills for a beginner SOC analyst is understanding security logs.
Windows Event Logs provide information about activities taking place on Windows computers, including successful logins, failed login attempts, process creation and account management changes.
By examining these records, security analysts can identify unusual behavior and investigate potential threats.
In this guide, you will learn five practical Windows Event Log analysis scenarios that can help you develop fundamental SOC investigation skills.
What Are Windows Event Logs?
Windows Event Logs are system-generated records that document different types of events.
Windows includes several important log categories:
Application Logs: Record events generated by applications.
System Logs: Record operating system and service-related events.
Security Logs: Record security-related activities, depending on the system's auditing configuration.
Security logs are particularly useful for examining authentication activity and certain system changes.
However, not every activity is logged automatically. Organizations must configure suitable audit policies and ensure logs are collected and retained.
How to Open Windows Event Viewer
Follow these steps on a Windows computer you are authorized to inspect:
- Press Windows + R.
- Enter
eventvwr.msc.
- Press Enter.
- Expand Windows Logs.
- Select Security.
You can browse the recorded events and inspect their details.
Use the Filter Current Log option to search for specific event IDs.
Some security events require elevated privileges to view, and available records depend on the computer's audit settings.
Important Windows Security Event IDs
| Event ID | Description |
|---|
| 4624 | Successful account logon |
| 4625 | Failed account logon |
| 4688 | New process created |
| 4720 | User account created |
| 4740 | User account locked out |
An event ID identifies an event type. It does not automatically confirm malicious activity.
Analysts must interpret events within their operational context.
Scenario 1: Multiple Failed Login Attempts
Imagine a user account records 25 failed login attempts within five minutes.
The relevant Windows Security event is:
Event ID: 4625
Why Is This Important?
Repeated authentication failures can indicate several possibilities, including:
- A user entering an incorrect password
- An outdated password stored in an application
- A misconfigured service
- An automated password-guessing attempt
The analyst should not immediately conclude that an attack occurred.
Investigation Steps
- Filter the Security log for Event ID 4625.
- Identify the account associated with the failures.
- Review the timestamps.
- Examine the source network address when available.
- Compare the activity with the account's usual behavior.
- Check whether a successful login occurred soon afterward.
Example Finding
Suppose the account employee01 shows 25 failures from an unexpected source, followed by a successful login.
This combination deserves further investigation because it could indicate unauthorized access.
The analyst should verify the source, affected account, authentication mechanism and surrounding activity.
Scenario 2: Successful Login at an Unusual Time
Consider an account that normally operates during office hours but records a login late at night.
The relevant event is:
Event ID: 4624
This records a successful logon.
What Should the Analyst Check?
Review:
- Account name
- Logon time
- Logon type
- Source address, when present
- Device information
- Previous account activity
For example, Logon Type 10 generally represents a RemoteInteractive session, such as a Remote Desktop session.
A late-night Remote Desktop login may be expected for an administrator performing maintenance.
However, an unexpected login involving a privileged account may require investigation.
Recommended Action
Compare the event with approved maintenance windows, user activity and other authentication records.
Escalate the event according to the organization's incident-response procedures if the activity cannot be explained.
Scenario 3: Suspicious Process Execution
Process creation logs help analysts understand which programs started on a system.
A relevant Windows event is:
Event ID: 4688
Process creation auditing must be enabled for the event to be generated. Recording command-line information may require additional configuration.
Example
Suppose a workstation executes an unfamiliar program from an unusual temporary directory.
A process creation event may provide details such as:
- Executable name
- Process identifier
- Parent process information
- Account context
- Command-line arguments, if configured
Investigation Steps
- Identify the executable.
- Review its file path.
- Check the process owner.
- Examine the parent process.
- Review the file's digital signature and reputation.
- Look for related events around the same time.
A program running from a temporary directory is not automatically malicious.
The analyst needs to identify whether the execution is expected, authorized and consistent with the device's normal activity.
Scenario 4: Unexpected User Account Creation
Organizations need to monitor account creation because newly created accounts may receive access to sensitive systems.
A relevant event is:
Event ID: 4720
This records the creation of a user account.
Example
A new account appears on a Windows system outside normal provisioning hours.
The analyst should investigate:
- Who created the account?
- Was the action approved?
- Was the account created by an authorized administrator?
- Did the account receive additional privileges?
- Has the account been used to sign in?
Account creation can be completely legitimate, such as when a new employee joins.
The potential risk comes from unexpected or unauthorized changes.
Recommended Action
Compare the event with approved identity-management requests and review related account modification and group membership events.
Escalate unexplained privileged access according to policy.
Scenario 5: Repeated Account Lockouts
Account lockouts can disrupt employee access and may sometimes indicate password-related attacks.
A relevant Windows event is:
Event ID: 4740
This records an account being locked out.
Example
A user account becomes locked multiple times during a single day.
Possible causes include:
- An outdated password saved on another device
- Repeated failed application authentication
- A misconfigured scheduled task
- Unauthorized password guessing
Investigation Steps
- Find the account lockout event.
- Examine the account and timing.
- Identify the source workstation when recorded.
- Correlate the activity with failed login events.
- Check whether the user recently changed their password.
- Determine whether the failures originate from expected devices.
A repeated lockout is not enough to prove an attack. The analyst must examine the broader sequence of events.
How SOC Analysts Analyse Logs Effectively
A good investigation follows a structured process.
Step 1 — Identify the alert
Understand which behavior triggered attention.
Step 2 — Collect the evidence
Gather relevant event IDs, timestamps, account information and device details.
Step 3 — Correlate events
Compare related events across a time window.
Step 4 — Establish context
Determine whether the behavior is expected, unusual or unauthorized.
Step 5 — Assess severity
Consider the affected system, privileges, potential impact and available evidence.
Step 6 — Document findings
Prepare a concise investigation summary and recommend suitable next actions.
Tools such as Splunk, Wazuh and Microsoft Sentinel can help organizations centralize and correlate events from multiple systems.
Beginner Practice Exercise
Create a controlled practice environment using a Windows virtual machine that you own or are authorized to use.
Enable the relevant audit policies where appropriate.
Then perform harmless test activities, such as entering an incorrect password on a test account or creating an authorized local test user.
Open Event Viewer and examine the generated events.
Record the event ID, timestamp, account information and observations.
Do not test unauthorized systems or attempt to generate security incidents in environments where you do not have permission.
How to Prepare for a SOC Analyst Interview
Interviewers may ask questions such as:
What does Event ID 4625 indicate?
It records a failed account logon attempt.
What is the difference between Event ID 4624 and 4625?
4624 represents a successful logon, while 4625 represents a failed logon.
Does a successful login mean the account was compromised?
No. Analysts must examine the source, logon type, authorization and surrounding activity.
Why is event correlation important?
A single log may provide limited information. Multiple related events can reveal a more complete sequence of activity.
What should an analyst do after detecting suspicious activity?
Collect and preserve relevant evidence, assess the situation, document observations and follow established escalation procedures.
Frequently Asked Questions
1. What are Windows Event Logs used for in cybersecurity?
They help analysts investigate system activity, authentication attempts, account changes and other events relevant to security monitoring.
2. Is Event ID 4625 always a security threat?
No. Failed logins can occur for legitimate reasons. Analysts must examine patterns and context.
3. What tools do SOC analysts use for log analysis?
Common examples include Windows Event Viewer, Splunk, Wazuh and Microsoft Sentinel.
4. Can beginners practise SOC log analysis?
Yes. A controlled Windows laboratory environment with suitable audit settings provides a useful introduction.
5. Is Windows log analysis useful for SOC analyst interviews?
Yes. Understanding log events, correlation and investigation procedures helps demonstrate practical security-monitoring knowledge.
Conclusion
Windows Event Log analysis is a useful starting point for aspiring SOC analysts.
Learning to investigate failed logins, unusual authentication activity, suspicious processes and account changes develops structured problem-solving skills.
The key is to treat logs as evidence, not automatic proof of an attack.
To explore network security, threat monitoring, security tools and practical investigation workflows, learn more about Itvedant's Cyber Security & Ethical Hacking with AI Course.