Top secret technical information about new fighter jets, navy vessels, and surveillance aircraft has been stolen from an Australian defence contractor.
Dan Tehan, the minister in charge of cyber security, on Tuesday confirmed the hacking of an unnamed contractor but did not reveal specific details.
Australian Signals Directorate incident response manager Mitchell Clarke told a conference in Sydney on Wednesday the hackers targeted a small "mum and dad type business" - an aerospace engineering company with about 50 employees in July last year.
He said the firm was subcontracted four levels down from defence contracts.
"The compromise was extensive and extreme," Mr Clarke told the Australian Information Security Association national conference in audio obtained by a freelance journalist called Stilgherrian.
"It included information on the (F-35) Joint Strike Fighter, C130 (Hercules aircraft), the P-8 Poseidon (surveillance aircraft), joint direct attack munition (JDAM smart bomb kits) and a few naval vessels."
Mr Clarke said the information hacked on the new Navy ships included a diagram in which you could zoom in down to the captain's chair and see that it was one metre away from the navigation chair.
Comment has been sought from Mr Tehan and the Defence department.
Mr Clarke described the security breach as "sloppy admin".
He said the organisation only had one IT person.
The Australian Signals Directorate dubbed the hacker "ALF", after a character in TV soap opera Home and Away.