Internet Service Provider Slingshot says it is working with New Zealand Police and international agencies to "proactively defend" customers from a serious malware attack that is sweeping the globe.
Known as GameOver Zeus, the virus lays dormant until it spots an opportunity to steal personal details such as online banking information and passwords.
Slingshot and CallPlus Chief Technology Officer Adrian Dick says the ISP has been proactively blocking thousands of sites after it was contacted by authorities over the weekend.
“GameOver Zeus is a large, sophisticated and potentially very damaging virus," he says.
“Over the weekend, we have blocked thousands of randomly generated domains, and will update these further as we are advised of new ones by the Police and international authorities.
“We believe the actions of ISPs will hold off problems for a couple of weeks, but it’s a cat and mouse game. The criminals behind the virus will be looking for ways around our actions.
"The most effective way for people to protect themselves is by using a good-quality anti-virus service.”
Dick says that Slingshot is contacting all customers advising them to ensure that their anti-virus is up-to-date.