Opens MITRE ATT&CK T-Code in your browser

Open-MITRE.ps1

function Open-MITRE 
{
    <#
    .SYNOPSIS
        Opens MITRE ATT&CK wiki page for the given T code in the default browser.
    .DESCRIPTION
        For a given technique code (Tnnnn), opens the wiki page for the corresponding 
        MITRE ATT&CK technique in the default browser.
    .PARAMETER TechniqueCode
        The ATT&CK technique code. This can either be a 4 digit number, or the fully
        qualified technique ID (e.g. T1120) of a documented MITRE ATT&CK technique.
        
        The leading T can be left off, it will be added by the function if missing.
    .INPUTS [String[]]
    .OUTPUTS void
    .EXAMPLE
        PS C:\> Open-MITRE -TechniqueCode T1120

        The above example will open a tab in the default browser to https://attack.mitre.org/wiki/Technique/T1120.

    .EXAMPLE
        PS C:\> 1110..1120 | Open-MITRE

        The above example will open up 10 tabs, 1 for each T code. Note that the T is left 
        off the technique code.
    #>
    param(
        [Parameter( Mandatory,
                    ValueFromPipeline )]    
        [Alias('TCode')]
        [string] $TechniqueCode
    )

    process {
        if (-not ($TechniqueCode.StartsWith('T'))) {
            $TechniqueCode = 'T{0}' -f $TechniqueCode
        }

        $url = ('https://attack.mitre.org/wiki/Technique/{0}' -f $TechniqueCode)
        Start-Process $url
    }
}