Hackers trying to host malicious code on otherwise innocent Web sites are using <A HREF="http://news.zdnet.com/2100-1009_22-6188553.html?tag=nl.e550">increasingly sophisticated techniques to avoid detection.</A>

Once hackers have subverted a Web site, it is in their interests to minimize the malicious code's window of exposure to help prevent detection and subsequent blocking by security software, according to a research paper produced by Finjan, the Web security vendor.