Here is how to find the group SID.

Make sure the group is on the computer you are using and run the following applet. NOTE: Don’t forget to use the single quotes on the where clause.

Code:
break on
$objWMIService = GetObject("winmgmts:\\.\root\CIMV2")
$colItems = $objWMIService.ExecQuery("SELECT * FROM Win32_Group Where Name = 'global admin group name'")
For Each $objItem In $colItems
      ? "Name: " + $objItem.Name
      ? "SID: " + $objItem.SID
Next
? ? shell “%comspec% /c pause”
Exit
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FACTA NON VERBA