The US has been named and shamed for hosting more malicious code and relaying more spam than any other nation. Despite efforts to clamp down on cybercrime, the US internet industry relays 22 per cent of all the world's spam and hosts 34 per cent of web-based malware.

Second place in both categories was taken by China, where 30 per cent of malware was authored, according to the Sophos Security Threat Report 2007. The UK managed a respectable ranking of 19, responsible for hosting 0.5 per cent of all malicious code-hosting websites.