On Friday, Anonymous claimed on Operations Australia Twitter account, that it had brought down the Australian Security Intelligence Organisation’s (ASIO’s) site for at least 30 minutes and was also targeting, the Defence Signals Directorate (DSD). While there was reported intermittent issues at both sites, neither were down for significant periods of time. According to CyberWarNews, the merry hacksters had also attempted to bring down the Tasmanian Police site on Sunday night, following a threatened attack on the same site August 7.
More:
http://www.theregister.co.uk/2012/08/12/anonymous_data_digging_downunder/