CYBER security experts tackled more than 1million cases of suspected credit card fraud in Britain last year.
They also faced 658 online attacks on the country by hostile nations including Russia, China, Iran and North Korea.
Details emerged in the third annual review by the Government’s National Cyber Security Centre.
The NCSC, part of the GCHQ spy centre, advises on how to avoid computer security threats.
Operation Haulster saw frauds against more than one million credit cards flagged up to banks.
In most cases this was before a crime had taken place, meaning hundreds of thousands of people were protected “before they lost a penny”, the review said.
But the NCSC warned that a “significant number of incidents continue to come from hostile nation states”. Staff tackled 658 cyber attacks between September 2018 and this August.
MORE TO BE DONE
Chief executive Ciaran Martin praised successful operations but said “there is much work to do”.
He said: “A significant proportion of our work has continued to take the form of defending against hostile state actors.
“Russia, China, Iran and North Korea continue to pose strategic national security threats to the UK.
“The most immediate threats to UK citizens come from large-scale global cyber crime.
“Despite often being low in sophistication, these attacks threaten our social fabric, our way of life and economic prosperity.”
The report also highlights tech which allows information on threats to be shared in seconds.
A programme targeting malicious websites led to a total of 177,335 being removed by their hosts.
Oliver Dowden, minister for cyber security, said: “There is no room for complacency. Securing the internet is a 24/7 challenge, 365 days a year.”