Convincing users to download malicious software using fake AV pages is not a new attack vector, but has been a very successful one. Julien has previosuly blogged about how fake codecs are starting to replace fake AV pages. I recently encountered an interesting example employing both fake AV and fake codecs in a single attack. When a victim visits a page, they are presented with a warning message stating “You don’t have the correct Codec installed. Download should start automatically, if not, please click here to download”. Here is the screenshot of the page:
The page is loaded from “hxxp://onlinetubes24.com/go.html”. Let’s take a look at the HTML source of the page to identify the malicious code.
As you can see, it downloads an exe from “hxxp://privatetube.onlinetubes24.com/codec.exe". If the victim runs “codec.exe”, it starts a fake antivirus scan and delivers a report such as the following:
The above screenshot is typical of a fake AV attack and displays several fictitious threats being detected on the victim’s computer. Every time you run this exe file, different threats are allegedly detected . Once installed, the victim is asked to activate or buy the full version of this fake AV. This exe file downloads it’s content from a remote web server hosted at “188.8.131.52”. The ThreatExpert report for this IP address details the network activity performed by this malware.