(Reuters) – A New Zealand stock market was hit by a fifth day of cyberattacks on Monday and crashed its website, but maintained trading after switching to a contingency plan for publishing market ads.
NZX Ltd. were stopped for most of last week due to the attacks, which authorities have said they originated from offshore.
Monday's attack came shortly after NZX said it had agreed with the Financial Markets Authority on a contingency plan to release market ads.  A spokesman for NZX confirmed that the site was down, but said that trading on its platform, which began at 10:00 local time (2200 GMT), continued as usual through the contingency arrangements.
He refused to comment on who was behind the attacks, regardless of whether there had been any blackmail demands or what measures had been taken to stop future attacks.
Boursen said in a statement that the exchange worked with the network's service provider, Spark, overnight cybersecurity agencies and a US cybersecurity company Akamai Technologies Inc. to implement additional security measures.
"NZX has been advised by independent cyber specialists that last week's attacks are among the largest, most resourceful and sophisticated ever seen in New Zealand," said NZX CEO Mark Peterson.
The market was almost flat at 0230 GMT.
NZX Ltd. faced disruption for four days last week when it was repeatedly hit by distributed denial of service attacks, a common way to disrupt a server by flooding it with a flood of internet traffic.
The attacks forced NZX to stop trading in its cash markets and disrupt operations in its debts. market, Fonterra Shareholders Market and derivatives market.
NZX said its central trading platforms were not affected by last week's attacks but the public website crashed, affecting the exchange's ability to publish
"At these times, NZX decided to stop the market to maintain market integrity," it said.
News sites for Stuff and Radio New Zealand had also been targeting cyber attacks, local media reported on Monday, but the attacks failed.
New Zealand, a relatively small economy with a population of five million, is not often the target of such attacks but neighboring Australia increased its cyber security this year after an increase in similar incidents.
Finance Minister Grant Robertson said last week that the Government Communications Security Agency and the National Authority Against Cybercrime had been called in to help the course.
NZX said the National Cyber Security Center had sent a warning message to New Zealand companies about the attacks. Catalog