If I'm not mistaken, some of the sample scripts here should help, particularly those in Logon Sessions.

This article may also help:

• Gathering WMI Data without Writing a Single Line of Code

I think you might benefit from replies to the thread VBA to Perl; marto has some great links on translating VBA to Perl (the same general principles should apply to VBS), and I've got a few references to some utilities as well.