Sophos uncovered an average of 29,700 new infected web pages every day.
The research for June puts the Iframe malware as by far the most prevalent web-based threat, making up 64 per cent of all threats during the month.
Earlier this month, an Iframe attack on multiple Italian web sites occurred, making headlines around the world. More than 10,000 web pages were infected, most of which were on legitimate but compromised web sites hosted in Italy.
Victim web sites included Italian city councils, employment services and tourism sites. Most of the affected pages appear to be hosted by one of the largest ISPs in Italy.
“The Italian Iframe attack should certainly act as a wake-up call to ISPs across the globe,” said Sophos senior security consultant Carole Theriault.
“Malicious code dumped on these web sites is just waiting to pounce on innocent surfers. Web sites should be as secure as Fort Knox, but at the moment, too many web pages are easy pickings for cybercriminals,” Ms Theriault said.
Nearly 60 per cent of malware-infected web pages in June were hosted in China, while 24 per cent were hosted in the US.
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