PowerShell version 2.0 doesn’t strongly integrate with AMSI, presenting an opportunity to bypass local controls.
Check Current Version in Interpreter
Dumps a table of version information related to the current interpreter session
$PSVersionTable
Checking for PowerShell Version 2
A registry value can be referenced to determine if PowerShell version 2 is available.
Get-ItemProperty HKLM:\Software\Microsoft\PowerShell\1\PowerShellEngine\ -Name PowerShellVersion
Dropping to a PowerShell Version 2
powershell -version 2.0
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