I had a dialog box open up the said "App Store is trying to install new software." requested an administrator username and password. I did not initiate a new software installation and I could not find out what new software the App Store was trying to install. I clicked on cancel several times and the dialog box kept reappearing. I finally provided an administrator username and password, out of frustration. Could this have been a malware install? How can I find out what new software was installed?