[Update April 4, 2014 9:21AM PDT] Our friends at PhishLabs recorded and posted a video of a fake Google Drive and Docs phishing scam in action. Check out their post here.
Every now and again, we read reports about phishing sites that look dangerously convincing—you can hardly tell the real one apart from the fake one anymore, unless you know what to look for and where. Our friends at Symantec found one such site some time in March.
The interesting bits about their find are that the scam page was actually hosted on Google's server and sported an https scheme name in front of the URL, which is what a genuine Google URL normally looks like. These made spotting the phish page almost impossible for anyone attempting to access their Google Docs or Google Drive account.
There are several fake Google sites out there that may not look as compelling and sophisticated as the Symantec find, but I have no doubt that these sites would have their share of victims, too.
Users of our products are protected from this web threat as Malwarebytes Anti-Malware already detects asdf.exe and its duplicates as Backdoor.Bot. This executable has a VirusTotal rating of 16/51 as of this writing.
The phishing page in question contains code that allows it to identify the browser type used to access it. It pops up an overlay message notifying the user that he/she needs to download a supposed set-up file in order to update their browser (and perhaps eventually the "outdated plug-ins").
We have observed that the overlaying only works on selected browsers, particularly Internet Explorer, Chrome, and Firefox. If you may recall, these are the top three most used browsers worldwide.
For Firefox users, the scenario is quite different: instead of an executable file, they are asked to download a browser add-on or extension named addon.xpi from a publicly accessible Dropbox folder.
Finally, this extension uninstalls itself from Firefox, thus, restoring the original state of the browser before the user encountered the phishing page. The system, however, is already infected by a malicious payload without the user's knowledge.
Although the downloading of malicious payloads cannot be replicated on the side of users who normally make use of Safari, Opera, or other browsers, we urge them to keep their guard up.
The phishing page can and will fool users into thinking that they are logging on to their Google Drive accounts if they're not careful. It's no longer enough to see https on the address bar and think it's the real thing.