IFrame Injection Attacks in the wild (Mar 7, 2014)

An HTML element is an individual component of an HTML document or web page. “iFrame” is one of these HTML elements, it defines an inline frame in the web page. An iFrame has the following format:

The Document Object Model (DOM) is a cross-platform and language-independent convention for representing and interacting with objects in HTML, XHTML and XML documents. With DOM, a user can easily manipulate the HTML elements with a script. A sample JavaScript code of the DOM is listed below:

 var node=document.getElementById("myList2").lastChild; document.getElementById("myList1").appendChild(node); 

iFrame Injection Attack is a method for an a attacker to embed code from another site by leveraging the iFrame tag with DOM. It is a popular way for drive-by-downloads. iFrame injection attacks are not quite as common as they once were on the web, however from time to time they do still happen. Dell SonicWALL Threat research team has observed multiple iFrame Injection Attacks in the wild.

Another example of the iFrame Injection can be in one of our recent SonicAlert Adobe Flash Zero Day(CVE-2014-0502) Exploit Analysis (Feb 27, 2014).

Dell SonicWALL Threat research team has created multiple IPS signatures to detect malicious iFrame tag in the web pages:

• 7292 Suspicious HTML Iframe Tag 1
• 7378 Suspicious HTML Iframe Tag 2
• 9767 Suspicious HTML Iframe Tag 3
• 10202 Suspicious HTML Iframe Tag 4

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The SonicWall Capture Labs Threat Research Team gathers, analyzes and vets cross-vector threat information from the SonicWall Capture Threat network, consisting of global devices and resources, including more than 1 million security sensors in nearly 200 countries and territories. The research team identifies, analyzes, and mitigates critical vulnerabilities and malware daily through in-depth research, which drives protection for all SonicWall customers. In addition to safeguarding networks globally, the research team supports the larger threat intelligence community by releasing weekly deep technical analyses of the most critical threats to small businesses, providing critical knowledge that defenders need to protect their networks.