Along with the F-35 and naval vessels, restricted technical information on the P-8 Poseidon, C-130 and the Joint Direct Attack Munition (JDAM) guidance kit was also stolen by the intruder.

The cyber thief was able to gain access to the network of the 50-person aerospace engineering firm that had been subcontracted by the Department of Defence.

"The company ... is very small, they run their own network, it's a network that's supported by one IT person. The rest of the company is either engineering staff or support staff to the engineering workforce," Clarke said.

The stolen information fell under the International Traffic in Arms Regulations (ITAR), a US regulatory regime that restricts and controls the export of defence and military related technologies.

In his highly detailed presentation, Clarke explained that the hacker had been in the network since at least mid July 2016, with data extrusion commencing roughly two weeks later. 

Disturbingly, Clarke's presentation also revealed the hacker had minimal trouble gaining access to the information, explaining that, while the defence contractor's network was small and vulnerable to threats, the ASD investigation found that its internet-facing services still had their default passwords, admin::admin and guest::guest.

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Audio of conference obtained via Stilgherrian/ZDNet.