About avast's Dual Phishing Protection
Internet Explorer's built in Microsoft SmartScreen
is designed to help improve security, and protect from evolving web and social engineering threats by scanning all websites visited and all web-based downloads. SmartScreen Filter (introduced with Internet Explorer 8) will alert users and block access to known infected websites and unknown or malicious executable files that you are attempting to download. The SmartScreen Filter helps users identify reported phishing/malware sites and helps them make informed decisions about downloads in three ways.
1. Anti-phishing protection screens threats from fake websites seeking to acquire personal information such as user names, passwords, and billing data. As you browse the web, it analyzes pages and determines if they have any characteristics that might be suspicious. If it finds suspicious pages, SmartScreen will display a warning page, giving you an opportunity to provide feedback and advising you to continue with caution.
2. Application Reputation removes all unnecessary warnings for well-known files, and show severe warnings for high-risk downloads. SmartScreen checks the sites you visit against a dynamic list of reported phishing sites and malicious software sites. If it finds a match, SmartScreen will show you a warning letting you know that the site has been blocked for your safety.
3. Anti-malware protection helps prevent potentially unwanted software (PUP) from infiltrating the computer. SmartScreen checks files that you download from the web against a list of reported malicious software sites and programs known to be unsafe. If it finds a match, SmartScreen will warn you that the download has been blocked for your safety. SmartScreen also checks the files that you download against a list of files that are well known and downloaded by many people who use Internet Explorer. If the file that you're downloading isn't on that list, SmartScreen will warn you.