Porn sites exploit IE bug to install spyware

Hackers are taking advantage of a newly discovered vulnerability in Internet Explorer to install spyware on PCs that visit a number of Russian porn sites.

Free IT resource Virtualization Insights from Top Experts - Learn how virtualization gets real! Sponsored by Dell Free IT resource TechNet: More ways to know it, share it, and keep it running. Sponsored by Microsoft VML EXPLOIT REPORT »Microsoft offers early fix for critical IE bug »Criminals spread Windows exploit via Web host » Pressure mounts for Microsoft to patch IE flaw » New security group patches VML bug » Rise in VML attacks prompt code yellow » Outlook vulnerable to critical VML bug » New IE zero-day targets VML »Porn sites exploit IE bug

The malware, first reported Monday by researchers at Sunbelt Software Inc., takes advantage of an unpatched flaw in the way IE processes Vector Markup Language (VML) code. VML is a language used to display graphic information on the Web.

The attack appears to work on all versions of Windows running the IE 6 browser, said Eric Sites, Sunbelt's vice president of research and development. "It's not an operating system-dependent issue," he said.

Sunbelt first discovered the malware on a Russian porn site late Friday. "This site and a couple of others use an exploit kit called Web Attacker, and it looks like the Web Attacker kit has been upgraded to include this new exploit," Sites said.

Since Friday, Sunbelt noticed that the attack code has popped up on about a half-dozen Russian porn sites. In addition, since security researchers estimate that Web Attacker is used by nearly 1,000 Web sites, this latest exploit should soon become more widespread.

Web Attacker is a software development kit sold for as little as US$20 to criminals looking for an easy way to develop malware.

"Since it's being built into the next version of the Web Attacker kit, we expect that this thing will be everywhere in a few days," said Sites.

Whether the attacks will be widespread enough for Microsoft to rush to patch the flaw remains to be seen.

On Tuesday, Microsoft confirmed the Sunbelt team's findings, and said it planned to fix the VML bug in its next set of security patches, scheduled to be released on Oct. 10, "or sooner as warranted," according to a statement from the company's public relations agency.

This is the second unpatched flaw found in IE over the past week. On Sept. 14, researchers posted code that could be used to exploit a different vulnerability in a multimedia component of Internet Explorer. Microsoft is still investigating that flaw and is not saying whether it too will be patched next month.

Sunbelt says that users can avoid the VML attack by disabling Javascript on their browsers. More information can be found on the Sunbelt blog, located here.