McAfee Site Advisor
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SiteAdvisor Extension for FireFox or Plug-in for Internet Explorer test the Web to help keep you safe from spyware, spam, viruses and online scams. McAfee SiteAdvisor warns you before you interact with a dangerous Web site. The software ranks web sites into red, yellow and green ratings to help Web users stay safe as they search, browse and transact online.
Google Binary Search
Probably McAfee can also use Google binary search index to locate malicious sites. Companies like WebSense are already doing it, read this article Mining for Malicious Code with Google
...There have been a few blogs from outside parties on the subject of Google's search engine indexing not only file types such as PDF and doc, but executable files as well. A Google query for "Signature: 00004550†will result in numerous links to executable files. The reason this search works is because when Google indexes the executable file, it parses the PE file format of the windows executable. One of the things that is extracted from the PE file is the signature "4550", the NT signature, present in all valid win32 PE files....
Firefox Extension for SiteAdvisor
McAfee has released a SiteAdvisor Plug-in for Firefox, when you search with Google, Yahoo! or MSN, SiteAdvisor's safety ratings appear next to search results.
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