https://www.theregister.co.uk/2018/05/30/dutton_says_asd_may_be_used_internally/

The Australian Signals Directorate, the nation’s signals intelligence agency, may be turned inwards after all.

Home Affairs minister Peter Dutton told the Australian Broadcasting Corporation’s 730 that the Directorate (ASD) may be used to defend critical infrastructure such as the financial system or emergency services hotlines.