AN EXPERT hacker allegedly shut down the Northern Territory Government computer system and deleted thousands of employees` identities, a Darwin court heard yesterday.
And the court heard the Government could still be at risk of another cyber attack.
David Anthony McIntosh, 27, allegedly hacked in and shut down several NT Government databases on May 5, including servers for the Health Department, Royal Darwin Hospital, Berrimah Prison and Supreme Court using his laptop at a Palmerston home.
Prosecutor Sergeant Erica Sims told the Darwin Magistrates Court yesterday the Sydney IT expert allegedly deleted the independent user accounts of 10,475 NT public servants.
She said many workers had to be "stood down``, and experts had been working "24 hours, seven days a week`` to repair the damage.
But Sgt Sims said it could take months to fix, with the repair cost estimated to run into the "hundreds of thousands of dollars``.
She said police contested Mr McIntosh`s bail application yesterday, as there were fears he made copies of passwords and data. If they existed, the court heard the alleged hacker could possibly access these "anywhere in the world``.
IT security consultant Anthony Ashbury said there was no proof copies existed "at this stage``, but they were examining the logs of a number of servers.
"We believe it may have occurred,`` he said.
Sgt Sims told the court police had found a file containing all NT Government passwords, including those of police, after his laptop and his colleague`s desktop were seized.
The Northern Territory News understands all Territory public servants have been directed to change their passwords.
"He (Mr McIntosh) has excellent computer knowledge ... he would understand the impact of his actions,`` Sgt Sims said.
Dressed casually in jeans and a t-shirt, Mr McIntosh looked anxious when Chief Magistrate Jenny Blokland refused him bail, citing his "tenuous ties`` to the Territory among her reasons.
The IT expert came to Darwin in Febuary as a service engineer, and was given "high level clearance`` to upgrade and maintain the NT Government`s entire system. Sgt Sims said when he resigned on April 7 his credentials were deleted.
The prosecutor alleged he used a colleague`s IP - a "unique numerical code`` - to access a "virtual private network connection`` with the government system and hacked in.
Lawyer Ian Rowbottam said it was "nonsense`` to suggest Mr McIntosh made copies.
A 10-day hearing has been set for October.
Mr McIntosh is facing charges of property damage over $50,000 and up to 10 years` jail if convicted.
