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EDR: Powershell Commands are not Shown in Command Line

EDR: Powershell Commands are not Shown in Command Line

Environment

  • EDR Console: All Versions
  • Microsoft Windows: 10 RS2+ and Windows 2016+

Symptoms

When running a command in powershell the commands do not show up in the command ine. 

Cause

Commands run within a powershell description are not seen without fileless scriptload enabled and searching fileless_scriptload_cmdline. 

Resolution

  1. Open the console
  2. Go to the sensors page and edit a sensor group
  3. Find the Event Collections tab and enable fileless script load. 
  4. When searching use fileless_scriptload_cmdline:

Additional Notes

  • The fileless_scriptload event leverages the Anti-Malware Scanning Interface (AMSI)support that is available in Windows 10 RS2+ and Windows 2016
  • Examples of powershell situations:
Here are some examples using Write-Output to display "hello world".

---------------

Example 1, we run the full command in command prompt
C:\Users\Administrator>powershell.exe Write-Output "Hello World!"
Hello
World!

Expectations, command line will be: powershell.exe Write-Output "Hello World!"
There would be no fileless scriptload here.

----------------

Example 2, we run the same thing but within a ps1 script

C:\Users\Administrator>powershell.exe C:\Users\Administrator\Documents\helloworld.ps1
Hello World!

The expectation here would be the command line is going to be: powershell.exe C:\Users\Administrator\Documents\helloworld.ps1

We would not see "Write-Output" as part of the regular command line

----------------

Example 3 We run powershell.exe, then run commands within the terminal session

C:\Users\Administrator>powershell.exe
Windows PowerShell
Copyright (C) 2016 Microsoft Corporation. All rights reserved.

PS C:\Users\Administrator> Write-Output "Hello World!"
Hello World!


Expectations are similar to the ps1 script in example 2 except command line will be just powershell.exe. 

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Creation Date:
‎04-21-2022
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