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A new Mac-specific trojan has surfaced that can push its own ads into websites viewed in Safari, Chrome, and Firefox. The trojan tricks users into installing an adware browser plugin that handles the job of inserting extra ads into Web pages.
The trojan, called Trojan.Yontoo.1, typically presents victims with a dialog asking them to install a new video or media player. Instead of installing the promised plug-in, the trojan instead installs an ad plug-in that sends data about loaded pages to a remote server that can embed code into the sites users visit and display extras ads, according the the Russian security firm Doctor Web.