Wednesday, March 2, 2011

New fake AV page uses Firefox internals

Most Fake AV pages mimic a Windows Desktop application running. In addition, the Fake AV pages have generally been the same regardless of which browser they are viewed. I recently found a new type of Fake AV page that looks different on each browser. And it also uses internal elements of those browsers.

Internet Explorer version

The version for Internet Explorer looks more like the previous pages I've seen.


Fake AV page for Internet Explorer

The malicious executable InstallInternetDefender_722.exe is detected by only 9.5% of AV!


Virustotal results for malicious executable

Firefox version

The version displayed in Firefox browsers is very interesting. It looks like the security warning Firefox shows for malicious and phishing sites.

Fake AV page for Firefox

The source code of the pages shows that the page is using internal elements of the browser to construct the page:
  • chrome://global/skin/netError.css
  • chrome://global/skin/icons/blacklist_favicon.png
Use of internal Firefox elements

The warning looks very legitimate.

    Chrome version

    Like for Firefox, the Chrome version looks like a legitimate browser warning.

    First warning from the fake AV page
    Fake AV page fro Chrome

    Safari version

    For Safari, only the first popup box is tailored to the browser. The main page is the same as Internet Explorer.

    Fake Av warning for Safari


    Fake AV continues to evolve. This new version for Firefox will surely fool more than one user.


    -- Julien

    2 comments:

    Anonymous said...

    The Safari one isn't tailored at all - that's Safari's standard JavaScript alert() call box. It's more likely a fall-back to 'unknown browser' - I dare say it behaves the same on other less well-used browsers.

    I've thought this for years though, browsers really should make it clear when a modal pop-up dialog box comes from a website - how about dimming the page in question and having the alert() in the middle of the page? Using the same alert window style as the rest of the OS is just asking for trouble. (At least Chrome puts "The page at example.com says" above, but it's still not distinct enough really.)

    seema said...

    nice