Cybercriminals are using fake celebrity sex videos, an imitation of the Angry Birds game and Facebook to get victims to hand over credit card details and download viruses.
And an increasing amount of software is exploiting everyday activity, such as downloading mobile phone apps and browsing popular websites such as YouTube, according to a new report by internet security company AVG Technologies.
One of last year's biggest threats was "scareware" software dubbed LizaMoon, which tricked victims into downloading fake antivirus programs.
For those using Mozilla Firefox, the user is presented with "never-before-seen" celebrity sex videos but when they click the "play" button, they are told to update their Flash installation.
However, the video is a fake and installs "Trojan horse" software disguised as a Flash update, which gives a hacker access to a computer.