Why does website data show websites I haven't visited? Do I have a problem with Malware or Spyware?
I have been experiencing some issues since visiting a legitimate website yesterday.
I went to log into the site and prior to inputting my user name and password was directed to another site which said "before you log in download Maccleaner" or something along those lines. (Mac cleaner may not be the actual name but I don't intend going back on the site to clarify).
I simply clicked on the X and closed the webpage but ever since I have been seeing upwards of 50 websites appearing in my website data tab under preferences.
Even when I "remove all website data", close safari, reboot the machine etc when I go back into the website data tab on restart there once again immediately are details of websites that I have never visited and have no idea what they are.
Despite clearing the website data, running CCleaner etc I cannot stop these sites appearing in my website data.
Has my machine been infected with malware or spyware?
What can I do?
Help!!!!
Prior to yesterday I had never had any problems what so ever with my iMac but now something just doesn't seem right with it. Safari seems slow on start up with icons for favourites taking time to populate etc.
All help gratefully received as I want my speed machine back to it's original state.
iMac (Retina 5K, 27-inch, Late 2015), OS X El Capitan (10.11.2)