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Computer networks at the Reserve Bank of Australia have been hacked, officials said Monday, some reportedly by Chinese-developed malware searching for sensitive information.
The central bank revealed the attacks after investigations by The Australian Financial Review found multiple computers had been compromised by malicious software seeking intelligence.
The newspaper said in one attack a Chinese-developed malware spy programme was searching in 2011 for information on sensitive G20 negotiations, where Beijing's exchange rate and currency reserves were on the agenda.
A Reserve Bank official confirmed the G20 virus to AFP and said it was confined to only "a few" computers. The official did not say what information was stolen, who was targeted, and would not confirm the Chinese connection.
A defence department official told AFP "the targeting of high-profile events, such as the G20, by state-sponsored adversaries, cyber-criminals and issue-motivated groups is a real and persistent threat".
"At least 65 percent of cyber intrusions on Australian computers have an economic focus," the official added.
"Cyber intruders are looking for information on Australia's business dealings, intellectual property, scientific data and the government's intentions."
In another sophisticated incident in 2011, revealed on the central bank's disclosure log under its freedom of information obligations, "targeted" emails were received regarding its strategic planning for 2012.
"Malicious email was highly targeted, utilising a possibly legitimate external account purporting to be a senior bank staff member," an official report by the bank's risk management unit said.
"As the email had no attachment, it bypassed existing security controls, allowing users to potentially access the malicious payload via the Internet browsing infrastructure."
Six users clicked on the mail, which had a legitimate email signature and a plausible subject title and content.
"Bank assets could have been potentially compromised, leading to service information loss and reputation (damage)," the official report said.
In 2011, the computers of Australia's prime minister plus foreign and defence ministers were all suspected of being hacked.
Reports and security experts said the attacks originated in China but Beijing dismissed the allegations as "groundless and made out of ulterior purposes".
At the time, Canberra said cyber attacks had become so frequent that government and private networks were under "continuous threat".
It said foreign intelligence agencies, criminal organisations and commercial competitors were all to blame.
Last year, Chinese telecoms giant Huawei was barred from bidding for contracts on Australia's ambitious Aus$36 billion (US$37 billion) broadband rollout due to fears of cyber attacks.