Freight giant Toll Group, which has operations in Wagga, is recovering from a 'ransomware' attack and the company could be Australia's largest victim to the new type of digital crime.

About two weeks ago, Toll found that a number of its computers systems had been scrambled and hackers were demanding payment to undo the damage.

Toll refused to pay and has been working to fix the intrusion, which has disabled parcel tracking for some customers.

Toll Group did not respond to requests for comment on whether its Wagga regional freight operations had been affected by the cyber attack.

Wagga City corporate services director Natalie Te Pohe said the council used multiple top-level security companies as part of its cyber security strategy.

"Council continually monitors its cyber security footprint," she said.

"[Software] patch management is undertaken on a weekly basis, along with firmware upgrades and rule reviews regarding emails and attachments.

"Additionally, Council engages an external company to undertake penetration testing every 12 to 18 months to identify any security vulnerabilities. These results are reported to the Audit, Risk and Improvement Committee, with all recommendations acted upon."

Ms Te Pohe said that the council had in the last 12 months engaged a security expert from IT security company Sophos to review the council's setup and "work with staff to achieve cyber security best practice".

Consultancy firm Accenture estimated that cyber attacks cost Australian businesses more than $10 million in 2018, with the damage increasing by 26 per cent compared to the year before.

Several hospitals in regional Victoria fell victim to ransomware attacks late last year.

Murrumbidgee Local Health District has been approached for comment about its precautions against cyber attack.