Best way to test Web Shield is to download ZIP version of EICAR. You can also try with double zipped EICAR. These files are normally not detected by avast! with disabled Web Shield.
You know what? That doesn't make any sense since any other anti-virus program should sound off to an EICAR file with or without a so-called "webshield." I am beginning to think most users don't even understand what the developers meant by adding on the new "webshield" provider. Every test I was recommended in this thread would be caught by any standard resident shield on any AV program.
And what does this mean..." I turned off my firewall on machine where i run web server and there was not 5 minutes when avast web shield answer..." Why would you stop halfway through the detail? I'm not going to fill in the blanks.
I'm sure the webshield works like it is intended to do but I'm not getting any satisfaction on testing it out because there is nothing to test with. I guess I will keep an eye out for a published review or something.
Year ago I used a version of PC-illin that had a so-called "webshield" and it worked fine but you never new it because there was really no way to test it. It just kept a vigil for what it would consider hostile scripts.
The Avast webshield has to be something above and beyond basic in the wild virus protection. It scans html and such while your viewing the page your pointing at.
From the Avast website:
Web Shield
The main highlight of avast 4.6 is undoubtly the new avast! on-access scanning provider - Web Shield. It is able to monitor and filter all HTTP traffic coming from the Web sites on the Internet. Since an increasing number of viruses (and other malware, such as adware, spyware and dialers) are being distributed via the World Wide Web, the need for an effective countermeasures has also increased. The Web Shield acts as a transparent HTTP proxy and is compatible with all major web browsers, including Microsoft Internet Explorer, FireFox, Mozilla and Opera.
Unlike most competitive solutions, the Web Shield's impact on browsing speed is almost negligible. This is because of a unique feature called "Intelligent Stream Scan" that lets the Web Shield module scan objects on-the-fly, without the need of caching them locally. Stream scanning is performed in operating memory only (without the necessity to flush the contents to disk), providing maximum possible throughput rates.