Australian citizen alleged to be the operator arrested.
Covid-19 documents and data,
To spy on customers.
Recommends password change.
Seven-year project has saved $278 million so far.
Brings in consultancy, ACSC to bolster protections.
File transfer application illegally accessed.
Backdoor shares similarities with existing malware.
Says EU commissioner.
Brad Blyth leaves to start "new exciting chapter".