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What's In A Link

01.23.2007 - 3:58 PM
When our classification systems are attempting to determine if a website is legitimate, one of the many factors taken into consideration is the reputation of the sites that link to the website in question. The theory is that if a known legitimate site links directly to another site, chances are that the linked site will be legitimate as well. Makes sense, right?

We are not the only ones who follow these practices. Results from search engines, such as Google, are heavily influenced by which sites have linked to the search result. Other web security vendors, such as McAfee's SiteAdvisor, base their decisions in part by which sites link to each other. Unfortunately, we are increasingly discovering that just because a reputable site links to another site, it does not necessarily mean that the link can be trusted.

Earlier today, one of our miners detected a perfect example of this when potentially malicious material was discovered on a website. This website might have automatically been classified as malicious; however, several reputable websites - including Microsoft.com - linked to the website.

Further investigation revealed that the domain name at one time belonged to a legitimate company. However, their domain registration expired and a nefarious individual quickly snapped up the domain. It gave us a friendly reminder that we cannot always trust a website on the Internet, no matter who vouches for them.

Microsoft Security Bulletin (from 2001):

Hijacked Website:

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