It also prevents known bad downloads (files) from even reaching your hard drive. This way you can prevent known exploits from affecting possibly still vulnerable browser. So anytime you view a webpage, pretty much entire content of that webpage is scanned by avast! even before it actually enters the browsers and also all downloaded files that come through HTTP protocol are also scanned.
While Network Shield is checking malicious packets (like Sasser or MSBlast generated TCP traffic) and checking of webpage addresses, Web Shield is scanning the actual transfered data. It stops the connection to malware even before the file is saved to the computer. WebShield scans only http traffic on redirected ports (generally, 80 only). Such as Win32.CodeRed, Win32.SQLSlammer, Win32.Blaster, in32.Welchia (Nachi) and Win32.Sasser. It is not a duplicate work with Standard Shield.īasically, it covers all Internet worms. These kind of attacks are not easily catched by ordinary antivirus during file or mail scanning. Typicaly these kind of viruses don't infect files but instead they attack running processes on your PC (either Windows components or some server programs like SQL Server, IIS etc.). Network Shield protects you from internet worms that spread themselves via various security holes in your system. It can be also taken as a lightweight firewall (or more precisely, an IDS (Intrusion Detection System). It analyses all network traffic and scans it for malicious contents. It can also block by IP's.Īlso, Network Shield is a protection against known Internet worms/attacks. The plan is to actually only block malicious URLs unless they're 100% certain there's no useful stuff hosted on the domain (in which case they will block it altogether). Network Shield works on both DNS and HTTP level, i.e., blocks domains on DNS level, but in no way it's limited to whole domains only. For performance reasons, though, it tries a bit harder in case of the well-known HTTP ports.
Network Shield filters traffic coming from all applications (not only browsers), and on all ports.
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