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Introduction
When a Windows system boots, it generates several critical security events—even without an audit policy configured. These logs can be invaluable for incident response (IR), threat hunting, and forensic investigations. This article explores the 13 default boot-time events, their significance, and how to leverage them for security monitoring.
Learning Objectives
- Identify the 13 default Windows boot-time security events.
- Understand how these logs aid in forensic analysis and threat detection.
- Learn how to extract and analyze these events using PowerShell and Event Viewer.
You Should Know
1. Process Creation Events (EID 4688)
Command:
Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4688} -MaxEvents 11 | Format-Table -AutoSize
What It Does:
This command retrieves the 11 process creation events generated during boot, including executions by SMSS.exe, autochk.exe, and registry-related processes. These logs help track early-stage process activity, which is critical for detecting persistence mechanisms or malicious payloads.
Steps to Use:
1. Open PowerShell as Administrator.
- Run the command above to list the 4688 events.
- Analyze the `ProcessName` and `CommandLine` fields for anomalies.
2. Registry Process Event (EID 4696)
Command:
Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4696} | Format-List
What It Does:
This event logs the creation of a registry process during boot. Attackers often manipulate registry keys for persistence, making this log valuable for detecting unauthorized changes.
Steps to Use:
- Check the `SubjectUserName` field to verify the process owner.
- Correlate with other boot events to identify suspicious registry activity.
3. Boot Configuration Data Loaded (EID 4826)
Command:
Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4826} | Select-Object -Property Message
What It Does:
This event indicates that Boot Configuration Data (BCD) was loaded. Compromised BCD can lead to bootkits or rootkits, so monitoring this event is crucial for integrity checks.
Steps to Use:
- Review the `Message` field for unexpected BCD modifications.
- Compare with baseline BCD settings using
bcdedit /enum all.
4. Extracting Boot Logs for Forensic Analysis
Command:
wevtutil qe Security /q:"[System[(EventID=4688 or EventID=4696 or EventID=4826)]]" /f:text /rd:true /c:20 > C:\BootLogs.txt
What It Does:
Exports the 13 boot-time events to a text file for offline analysis.
Steps to Use:
- Run the command to save logs to
C:\BootLogs.txt. - Use tools like Event Viewer or ELK Stack for deeper analysis.
5. Enabling Process Command Line Logging
Command:
reg add HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\Audit /v ProcessCreationIncludeCmdLine_Enabled /t REG_DWORD /d 1 /f
What It Does:
Enables command-line logging for EID 4688, providing critical context for process executions.
Steps to Use:
1. Run the command and reboot the system.
- Verify logging via
Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4688} | Select-Object -First 1.
What Undercode Say
- Key Takeaway 1: Boot-time logs are a goldmine for detecting early-stage compromises, especially in environments where full audit policies aren’t enabled.
- Key Takeaway 2: Correlating EID 4688, 4696, and 4826 can reveal stealthy persistence techniques, such as registry-based attacks or bootkit infections.
Analysis:
While these events are generated by default, their utility depends on proper collection and analysis. Organizations should:
1. Centralize these logs using SIEM tools.
2. Baseline normal boot activity to detect deviations.
- Combine with other telemetry (e.g., Sysmon) for comprehensive visibility.
Prediction
As attackers increasingly target low-level system components (e.g., BCD, SMSS), boot-time logs will become a critical battleground for defenders. Future Windows updates may expand default boot logging, but proactive monitoring remains essential.
For deeper research, refer to Nasreddine B.’s GitHub repository.
IT/Security Reporter URL:
Reported By: Nasreddinebencherchali Misc – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
