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Home / New Zealand
Updated

26,000 New Zealanders’ devices infected with malicious software, cyber security agency warns

RNZ
9 Dec, 2025 06:10 PM3 mins to read

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Technology editor Chris Keall joins Herald NOW to discuss cybersecurity.

By Penny Smith of RNZ

The country’s cyber agency is alerting tens of thousands of New Zealanders that their device has been infected with malicious software.

The National Cyber Security Centre (NCSC) was sending emails to around 26,000 email addresses today, warning about the malware Lumma Stealer, which was designed to steal sensitive information like email addresses and passwords.

Some of the stolen passwords were connected to government agency systems and bank accounts.

The NCSC’s chief operating officer, Michael Jagusch, said it was the first time the agency had contacted so many people.

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Malware pushers often use fake alerts. Jagusch says if people have concerns, they should double-check that the sender address is no-reply@comms.ncsc.govt.nz.

Running antivirus software should remove Lumma Stealer. The agency has put a full guide to dealing with the malware on its website here.

The National Cyber Security Centre (NCSC) is sending emails to around 26,000 email addresses on Wednesday warning about the malware Lumma Stealer. Photo / 123rf
The National Cyber Security Centre (NCSC) is sending emails to around 26,000 email addresses on Wednesday warning about the malware Lumma Stealer. Photo / 123rf

“We have worked with New Zealand government agencies and financial institutions to help protect their affected customers. However, there is a large group of users we are now contacting directly,” Jagusch said.

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“Malicious software like this is relatively common, but this is a very significant amount of New Zealanders that we know have been impacted by this and that’s why we are doing the outreach at this scale.”

Lumma Steeler was designed to go undetected and typically infected devices using Microsoft Windows operating systems.

“The malware’s purpose is to give these cybercriminals information that might let them gain access to your account and ultimately these cyber criminals are looking to steal money,” Jagusch said.

“They might also use the information for further attacks ... They might be able to create more tailored phishing emails against you and your family.”

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Jagusch said it’s unlikely the affected people were targeted.

“These people would have unknowingly downloaded the software by clicking a link within a phishing email or downloading the software from a compromised website,” he said.

Jagusch added that Lumma Stealer was available for purchase on the dark web.

“There has been a real commercialisation of the cyber crime industry, meaning that malware like this can be purchased by anyone, anywhere in the world,” he said.

The NCSC was alerted to the attack through an international threat sharing forum.

The agency wanted people who received the email to go to its Own Your Online website for advice on what to look for and how to remove the malware, or to contact an IT provider for help.

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The original email address for notifications supplied by the National Cyber Security Centre contained an error. It has been updated.

– RNZ. With reporting by Herald staff

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