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PowerShell is not just an attacker’s tool—it’s a defender’s secret weapon. In Season 1 of PowerShell-Hunter, Michael Haag discussed detection mindset, toolkits, and why PowerShell is crucial for cybersecurity professionals.
🔗 Listen to the Podcast: PowerShell Podcast
🔗 GitHub Repository: PowerShell-Hunter Repo
You Should Know: PowerShell Commands for Cyber Defense
1. Logging & Telemetry
Enable deep PowerShell logging to detect malicious activity:
Enable Script Block Logging Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\PowerShell\ScriptBlockLogging" -Name "EnableScriptBlockLogging" -Value 1 Enable Module Logging Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\PowerShell\ModuleLogging" -Name "EnableModuleLogging" -Value 1 Enable Transcription Logging New-Item -Path "C:\PS_Logs" -ItemType Directory Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\PowerShell\Transcription" -Name "EnableTranscripting" -Value 1 Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\PowerShell\Transcription" -Name "OutputDirectory" -Value "C:\PS_Logs"
2. Hunting Suspicious Activity
Search for encoded PowerShell commands (common in attacks):
Get-WinEvent -LogName "Microsoft-Windows-PowerShell/Operational" |
Where-Object { $_.Message -like "EncodedCommand" } |
Select-Object TimeCreated, Message
3. Analyzing Process Execution
Check for unusual PowerShell processes:
Get-Process | Where-Object { $_.ProcessName -eq "powershell" } |
Select-Object Id, StartTime, CommandLine
4. Blocking Malicious Scripts
Use AMSI (Antimalware Scan Interface) to scan scripts in real-time:
Check AMSI status (Get-MpComputerStatus).AMSIEnabled Force AMSI scan on a script $MaliciousTest = "Invoke-Mimikatz"
5. Detecting LOLBins (Living-Off-The-Land Binaries)
Find scripts abusing legitimate Windows tools:
Get-WinEvent -LogName "Security" |
Where-Object { $<em>.Id -eq 4688 -and $</em>.Message -like "powershell -nop " } |
Select-Object TimeCreated, Message
What Undercode Say
PowerShell remains a double-edged sword—attackers abuse it, but defenders can turn it into a hunting powerhouse. By leveraging script logging, AMSI, and process monitoring, security teams can detect and mitigate threats faster.
🔹 Key Commands to Remember:
– `Get-WinEvent` – Extract Windows event logs for anomalies.
– `Set-ItemProperty` – Configure PowerShell logging.
– `Get-Process` – Monitor running PowerShell instances.
– `(Get-MpComputerStatus).AMSIEnabled` – Verify AMSI protection.
🔹 For Linux Analogs:
Log auditing in Linux sudo grep "powershell" /var/log/auth.log Process monitoring ps aux | grep -i "powershell" Check command history cat ~/.bash_history | grep -i "curl|wget"
🔹 Windows Defender Integration:
Scan a file with Defender Start-MpScan -ScanPath "C:\Suspicious\file.exe" -ScanType QuickScan Check last scan results Get-MpThreatDetection
Expected Output:
A well-configured PowerShell logging system should generate logs in `C:\PS_Logs` and Security Event Logs, helping defenders track malicious activity. Use Atomic Red Team (GitHub) for testing detections.
🔗 Further Reading:
This structured approach ensures defenders hunt smarter, hunt harder. 🚀
References:
Reported By: Michaelahaag Powershell – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
