Take these precautions
Internet service providers (ISPs) are working hard on their end to filter out pharmed sites. The main thing you can do to protect yourself on your end is to make sure the Web site is authentic. You need to use more than one method to stay ahead of the pharmers. Remember, most of these authentification methods are set up to work only on the pages where you're asked to enter your personal information.
Use a trusted, legitimate Internet Service Provider. Rigorous security at the ISP level is your first line of defense against pharming.
The attacker obscures the actual URL by overlaying a legitimate looking address or by using a similarly spelled URL. Check the Web browser's address bar to make sure the spelling is correct. For example, when you type http://www.google.com, you should see that address. But the address for a pharmed site might be http://www.nsgoogle.com.
Check the http address. When you get to the page where you're asked to enter personal information, the http should change to https. The "s" stands for secure.
Verify the certificate of the site. It takes just a few seconds to tell if a site you land on is legitimate. On the latest version of Internet Explorer and on many other commonly available Web browsers, go to "File" in the main menu and select "Properties," or right-click your mouse anywhere on the browser screen and, from the menu that pops up, click "Properties." When the "Properties" box opens, click "Certificates," and check if the site carries a secure certificate from its legitimate owner.
Look for a padlock or key on the bottom of your browser or your computer task bar. A locked padlock, or a key, indicates a secure, encrypted connection and an unlocked padlock, or a broken key, indicates an unsecured connection.
Install an antivirus program from a trusted security software provider to reduce your exposure to pharming scams. Use a personal firewall to protect your data from hackers, viruses, worms, and Trojan horses.
Download the latest security updates (or patches) for your Web browser and operating system.