Before submitting a complaint, you should familiarise yourself with the auDRP policy, in particular schedule A, 4.a which outlines the key elements that you will need to prove to be successful. They are:
(i) the domain name is identical or confusingly similar to a name, trademark or service mark in which you, the Complainant, has rights; and
(ii) the third party (Respondent) has no rights or legitimate interests in respect of the domain name; and
(iii) the domain name has been registered or subsequently used in bad faith.
The key element here is proving bad faith. For example, if you have a registered trademark “Widgets R US” which was registered on 01/01/2000 and a 3rd party registered an identical or confusingly similar domain name widgetsrus.com.au on 25/12/2001 you have the basis to start developing your case.
Although having a trademark registered to support your complaint is important it is not always necessary, particularly for brands that have built strong brand equity within a relevant market.