Chester Wisniewski of Sophos Security reported yesterday that scammers are at it again. If you use the Mozilla Firefox browser, scammers detect your user-agent string and may present you with a fake Firefox security alert. The pop-up will state that it is scanning your system and that your system is affected by numerous virus attacks. It will then recommend that you click on the start protection button to erase all threats. If you click on that button you will download the fake antivirus.
Chester sums it up well:
Taking advantage of detailed information about the person’s computer and software allows for a much more specific, believable social engineering attempt.
We are likely to continue to see these criminals targeting each operating system, browser and any other details that can be gleaned from HTTP requests sent from our devices. [Source]
When you visit any webpage, your browser sends the user-agent string to the web server that you are visiting. This string tells the hosting site what browser and version number you are using and also discloses information about your operating system and version. The user-agent string is supposed to be used by the web server to provide content that is specifically tailored to your browser. It is not supposed to be used to send you socially engineered pop-ups. You can view your browser user-agent string here.
The Cocoon plug-in for Firefox does not automatically download a file once you click on a button! Cocoon does provide a stop and think procedure in order to allow you to make the choice whether to download the file or not.
You can find out more about Cocoon at GetCocoon.com
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