Os X Flash Player
+ OSX/Shlayer: New Mac Malware Comes out of Its Shell Posted on February 21st, 2018 by Over the weekend, Intego researchers discovered multiple variants of new Mac malware, OSX/Shlayer, that leverages a unique technique. Although malware that disguises itself as an update to Adobe Flash Player is nothing new, some of the latest incarnations of fake Flash Player installers have an unusual method of downloading additional content. How are Macs getting infected?
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Intego researchers found OSX/Shlayer spreading via BitTorrent file sharing sites, appearing as a fake Flash Player update when a user attempts to select a link to copy a torrent. Torrent sites are notorious for distributing malware and adware, sometimes through misleading advertisements, and sometimes through downloads that claim to be 'cracks' or that may contain infected copies of legitimate software (watch our recent or read our article to learn more about the dangers of torrent sites). Even if you don't use torrent sites, you may encounter other sites that claim you need to update Flash Player; in most cases, this is actually an attempt to install malware on your computer. On some of the malware distribution pages, the fake Flash Player alerts are customized to your browser. If you're using Mozilla Firefox, you may see an upward-facing arrow appear pointing to the browser toolbar that indicates that there is a recent download available to open.
If you're using Google Chrome, you may see a pop-up message pointing to the bottom-left corner of the browser window where newly available downloads appear. Ironically, Google Chrome has its own built-in version of Flash Player that users don't need to update manually; it gets updated automatically whenever Google issues an update for Chrome itself.
What's unique about OSX/Shlayer? Format hard drive for mac and windows large files. The initial Trojan horse infection (the fake Flash Player installer) component of OSX/Shlayer leverages shell scripts to download additional malware or adware onto the infected system. You can think of shell scripts as a way to execute a series of commands in sequence, sometimes without requiring any user interaction. They're sort of like a command-line equivalent of an or app, or the Mac equivalent of a Windows.bat ('batch') file. Instead of malware having to open up the on your Mac and type commands right before your eyes (which would be a pretty obvious sign of infection), malware can secretly execute those commands in the background without the user's knowledge by leveraging shell scripts. Malware that downloads additional malicious or undesirable code is known as a dropper.