Ironically, the US network with the largest number of sites spreading malware is Google itself, one of Stopbadware.org's prime sponsors and the source of the site data.
On Stopbadware.org's most recent top 10 list, Google ranked fourth, primarily because of the company's Blogger service, and hacked and/or malicious blogs hosted there, said the group. In March, Google held first place, although the number of infected sites hosted by its network was actually about 13 per cent less than in May.
"We take malware blogs very seriously," Google said in a statement it sent to Stopbadware.org when the anti-malware organization contacted the top 10 networks. The group posted the replies it received on its own blog. "On a daily basis, malware blogs are created by bad guys, and subsequently detected and deleted by Google," continued Google's response. "Given that there are millions of active blogs in our network, 4,261 is just a very small percentage of the total blogs."
The May report can be downloaded from Stopbadware.org's site (download PDF).