Malwarebytes' latest tool protects against ransomware
This might be worth looking into, I haven't had much chance to look into what conflicts it might have with Kaspersky Internet Security, but if it can coexist with current tools, it might be good to use. Just be careful with what you do, as it is Beta, so may cause problems, but there are some Gulchers here who seem pretty savvy about software.
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Mac users used to be very smug about not even needing anti-virus like we poor, unwashed Windows users. Now if you read the trades you'll see that the majority of new malware is targeting the Mac OS.
What's ransomware? What's a virus? What's malware?
Anti-Malware isn't a real-time scanner unless you're paying for Premium, you have to run it manually.
Anti-Exploit runs as a service and I believe it's monitoring traffic from your Internet connection, but I wouldn't swear to that under oath. It's definitely doing real-time monitoring.
As you're aware, you cannot run two anti-virus products simultaneously - or more correctly, you can't do that without running into a lot of problems. All the good products will disable your current anti-virus as part of their own installation routine.