mshelper, new kid on the malware block...
In recent days, couple of users have posted questions about mshelper.
EtreCheck will help.
Launchd: /Library/LaunchDaemons/com.pplauncher.plist
Executable: /Library/Application Support/pplauncher/pplauncher
Details: Domain name invalid - possibly adware
MacBook Pro, macOS High Sierra (10.13.2), iPad Air