Running iMac with the latest Yosemite and Safari upgrades. Today, as I was reading a news story on Safari, a small rectangular text box opened in the middle of the page with the following message: You might not be running the latest security software on your Mac. The message advised that the user call a 877 number for assistance. Could this be the same malware that is showing up on iOS? Or was this just a popup, attempting to sell something?