When I start Skype on my Mac, Webroot shows Suspicious Activity Detected:

SYstem Folder Modified /Users/myusername/Library/LaunchAgents/com.skype.skype.shareagent.plist

/Applications/Skype.app/Contents/MacOS/Skype

 

Why Webroot marks Skype as a suspicious activity? Is that a false positive? I also noticed a similar notification when I installed Office 2016 for Mac at the first time. The installation file is downloaded directly from my Microsoft account, so I assume that it's clean. But Webroot still warned.