Using IronPort SenderBase, Cisco estimated that search engine queries lead to 74 percent of Web malware encounters in 1Q10. Fortunately, two-thirds of those encounters either did not deliver exploit code or were blocked. But that means 35 percent of Web-borne exploits are still reaching browsers, where they try to drop files, steal information, propagate themselves, or await further instructions.
Browser phishing filters, anti-malware engines, and up-to-date patches can play a huge role in defeating malware reaching the desktop. However, to find unguarded vectors and unpatched vulnerabilities, let's look at how today's most prevalent Web malware works.
#10: Last on Cisco's list of 2Q10 encounters is Backdoor.TDSSConf.A. This Trojan belongs to the TDSS family of kernel-mode rootkits, TDSS files are dropped by another Trojan (see Alureon, below). Once installed, TDSS conceals associated files and keys and disables anti-virus programs by using rootkit tactics. Removing TDSS from a PC is difficult; using up-to-date anti-malware to block the file drop is a better bet.
#9: Ninth place goes to an oldie but goodie, Mal/Iframe-F. Many variants use this popular technique: inserting an invisible HTML <iframe> tag into an otherwise legitimate Web page to surreptitiously redirect visitors to other Websites. Hidden iframes may elude detection by the human eye, but Web content scanners can spot them and Web URL filters can block redirects to blacklisted sites.
Read the rest at eSecurity Planet.