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PowerShell objects versus text and hunting implications

2026.09.11//8 MIN READpowershellthreat-huntingwindowsdetection-engineering

// The Object-Oriented Approach of PowerShell

When working with PowerShell, the ability to manipulate objects instead of just text is a game changer. Each command can return structured data that can be piped into other commands or formatted into different types of outputs. This differs from traditional command-line tools that primarily output plain text.

A Real-World Scenario

Imagine you are investigating a series of unauthorized access attempts on a Windows server. If you rely solely on text-based tools, you might miss out on the rich detail provided by PowerShell objects. For example, querying for user sessions can be done using the Get-WmiObject cmdlet:

Get-WmiObject -Class Win32_ComputerSystem | Select-Object UserName, Domain

This command returns structured output about the currently logged-in user, including their username and domain. Instead of parsing text outputs, you can directly work with these objects, making your filtering and sorting more efficient.

Key Differences in Hunting Techniques

1. Precision: When using PowerShell, you can filter results at the object level. 2. Ease of Use: Objects allow for complex data manipulations without needing elaborate parsing scripts. 3. Rich Data: You have access to a wider range of properties for each object, which can reveal hidden insights about system state and user activity.

Common Commands for Threat Hunting

Here are some PowerShell commands that can help you focus your investigations:

# List all logged-in users with their session IDs
Get-WmiObject -Class Win32_ComputerSystem | Select-Object UserName, SessionID
# Retrieve active connections using the TCP protocol
Get-NetTCPConnection | Where-Object { $_.State -eq 'Established' }

Mistakes to Avoid

  • Ignoring Object Properties: When you retrieve data, ensure you’re aware of the properties available on each object. Use Get-Member to explore object structure.
  • Neglecting Pipelining: PowerShell shines when you pipe objects into other cmdlets. Failing to utilize this feature can lead to unnecessary complexity.
  • Misunderstanding Output: Getting used to the object-oriented output can take time. Always check the output type; use Get-Member to better understand what you're working with.

Advanced Usage Scenarios

#### Filtering and Formatting Output

To focus on specific attributes, you could use:

Get-Process | Where-Object { $_.CPU -gt 100 } | Format-Table -Property Name, CPU

This command filters processes that are using more than 100 CPU cycles and formats the output into a table, making it easier to read and analyze.

#### Custom Objects for Threat Hunting

You can create custom objects to encapsulate information that’s relevant to your hunt. For example:

$myObject = New-Object PSObject -Property @{Name='Unauthorized Access'; Time='2023-10-01 10:00'; Details='Failed login attempts'}
$myObject

This custom object can be extended or modified as needed and can be output or logged for further analysis.

Defensive Implications

Understanding how to leverage PowerShell's object capabilities not only enhances offensive tactics but can also inform defensive strategies:

  • Detection Engineering: Create alerts based on the properties exposed by PowerShell objects to detect anomalous behavior more effectively.
  • Security Auditing: Regularly audit PowerShell usage and filter commands in logs that interact with sensitive object properties.

Short Checklist for Effective PowerShell Hunting

  • [ ] Familiarize with Get-Member to explore object properties.
  • [ ] Utilize pipelining to create streamlined command sequences.
  • [ ] Regularly practice with real scenarios in your lab environment.
  • [ ] Log and analyze PowerShell activities for unusual patterns.
  • [ ] Review and understand user permissions for PowerShell access.

// Closing Thoughts

PowerShell's ability to handle objects rather than mere text provides immense potential for threat hunting on Windows systems. Leverage this feature to improve your detection capabilities and refine your investigations. As always, practice these techniques in a controlled lab environment, and remember that the DaemonCore Academy curriculum is free to enhance your skills further.