Matches Celaenia dubia on http://www.arachne.org.au/01_cms/details.asp?ID=2386, but is more like C. atkinsoni in Whyte & Anderson's 'A field guide to spiders of Australia'.
Celaenia sp. (genus) is listed in the following regions:
Canberra & Southern Tablelands | Barwon South West
Maps
Bruce RidgePlaces
Corio, VIC