Sometimes when you are browsing internet you will see “Reported Attack Site!” page, like this
Reported Attack Site!
This web site at www.nameofthedomain.com has been reported as an attack site and has been blocked based on your security preferences.
Attack sites try to install programs that steal private information, use your computer to attack others, or damage your system.
Bing search automatically filter sites that download malicious software. As bing crawls the web, it assess whether a page contains any malicious elements or exhibits any malicious behavior, and then flag questionable pages with a warning message. Bing can block new threats from existing malicious sites, even if those threats are not yet blocked by traditional antivirus or anti-malware signatures.