You might have seen many web sites marked as “Reported Attack Site!” by Google with following message:
“This web site at XXXXX.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.
Some attack sites intentionally distribute harmful software, but many are compromised without the knowledge or permission of their owners.”
Now a day, such type of attacks on the web sites are common. There are few reasons in which Google marks the web site as harmful site. Some of them are as follow:
 Your site is hosting phishing page.
 If you have installed updated version of third party scripts, template, theme etc.
 The third party scripts which you are using in your web site are not secure.
 Your FTP password is compromised. You can ask your web hosting provider to check FTP logs for your account.
 The system from which you are managing your web site is infected by Maleware, Trojan, Spyware, Virus etc.
 Insecure folder permissions set in your web site.
To remove “Reported Attack Site!” tag from your web site at the earliest, you can use Google Webmaster Tools to analyze your web site. Using this tools, you can easily find the infected pages of your web site and then you can resubmit the request to Google.
Hope this will help you! 🙂