An anonymous reader writes: Hackers have set up a clever new clickjacking campaign taking advantage of pop-up alerts that European users are (by now) accustomed to see: the "EU Cookie Law" notifications. The criminals are placing a legitimate ad banner on top of the warning message via an iframe. The trick is to make the ad invisible by setting its opacity to zero. So, each time a user clicks anywhere on the legitimate message, he or she clicks also on the hidden ad.
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