The Internet Explorer vulnerability may hit 0.2 per cent of internet users worldwide.
Writing on the Microsoft Malware Protection Center blog, Ziv Mador and Tareq Saade claimed that the trend is going upwards as there has been an increase by over 50 per cent in the number of reports compared from Friday to Saturday.
The bloggers claimed that legitimate websites were maliciously modified to include the exploits, with a search engine in Taiwan found to be hosting the exploit that was quickly cleaned.
They also claimed that some pornography sites have started hosting these exploits, with a Hong Kong website hosting a Trojan downloader to users who had hoped to watch its content becoming targets of the attacks. The Trojans were detected as Trojan:Win32/VB.IQ.dr and Trojan:Win32/VB.IQ.