writes "Social engineering attacks are showing a strong rise this Summer. The latest trick is manipulating YouTube users to infect their PCs with a Trojan known as the Fake Codec. For most media, a certain codec is required to encode and decode a digital stream such as audio or video. When a user tries to view a video that requires a specific codec, they'll usually get the message, "Codec not found" or "The proper codec to play this media is not installed." Some sites will usually direct you to another website to download the codec; however, an increasing trend in late August is for hackers to direct users to download a fake codec, which will in turn install malicious software on the user's machine."