Hello I am on Mac OSX 10.12.6.
Starting today norton has been throwing up attempted connections from random files from safari web history items to mp3 files. when this happened I when into panic mode and started to run the scans detailed below.
I ran a full norton scan and have also run kaspersky virus scanner and a malware bytes scan. The malwarebytes scan found a item called spigot. Kaspersky and norton both spotted a zip file in my downloads kaspersky identifies it as HEUR:Trojan.Win32.Generic.
At time of writing norton is playing silly and when i try to open it up a window with "pending..." and a loading bar. I think it said that it deleted the offending item and I cannot remember the name of it. If I get norton working again then I will update.(I think a reboot might fix but am nervous to do so.)
I cleared the malwarebytes quarantine and deleted the zip file.