
AVG found out that Blackhole Exploit Kit, compromised website is still the most effective attack vector for hackers to install malware on your computer with 47.6 percent of all malware installs occurring in Q4 of 2011. Another 10.6 percent are tricked into downloading exploit code. Fake pharmacy sites are a popular attack method, seen in about 10.4 percent of all attacks. Fake antivirus scanners remain a popular malware injection method at 8.4 percent.
Explanation of above mentioned top 10 web threats:

Source: AVG Report








