Hey, I'm new here, but thought I'd make the 30" effort it takes to register and contribute to the discussion.
To begin with, here some background:
I run a dual-boot system with (Kubuntu) Linux and Win 8.1, and spend about 99% in Linux, which is my main OS. I only revert back to Windows for video editing and the likes (Linux free software just can't compete with Adobe's...). I'd pretty much forgotten what viruses were until today (hadn't logged into windows for about 6 months).
I use Avast Security Pro. I was downloading an activator tool for a known piece of software, but all versions I found seemed "a bit" fishy (asking for vpn installation...??? That's bold....). Avast has always worked well for me: very configurable, good detection rate, generally no problems, was happy with it. Opened one of the cracks in Avast's virtual sandbox, realized it came with
more than advertised. Tried another. Right-clicked on the .exe and chose avast's "execute virtually", and unexpectedly, it opened the app directly, IN Windows, outside the sandbox. And Bam! Trojans-R-us!
Here is where I became hesitant about Avast's actual capabilities: removed 6 threats. Several browser bars, docks and fake antiviruses went undetected. Was unable to cleanout firefox. I installed Malwarebytes Pro and it found 10X the amount of threats Avast found, listing a ton of the new apps that Avast had ignored. In the meantime, Avast popups kept showing me how it was granting internet access to all this malicious software (I had it configured so it would decide firewall rules automatically but show me every time a new rule was created, so I could modify it if I didn' agree). 7+ apps that Malwarebytes detected were granted full internet access, so not much to be said about Avast's Firewall (unless you set it to fully manual). After Avast's cleanup, Malwarebytes still found over two dozen threats left behind. I had to reinstall Firefox to get rid of all the crap.
Did a bit of research and tried Bitdefender. UI is nice, but that's about where it ends. I haven't had time to test it thoroughly, but have already taken a dislike to it. First, real-time detection feels poor: whereas Avast (with all its shortcomings) would prevent zip extractions for infected files, or even warn me the minute I selected them (before opening), Bitdefender fails to even detect those files as threats when scanned on-demand. I don't dare double-click to see if it will be able to prevent disaster mid-installation (and yes, these reference exes and zips are the ones the infected my PC under Avast, so I know they're malware, and for in case they'd been "cleaned" up by Malwarebytes, I downloaded them again. But no, bitdefender doesn't seem to have an issue with them. In fact, Avast even blocked the download, I had to deactivate real-time shield to download them in the first place, whereas Bitdefender fails to do that either).
And that's without counting how buggy it is. For some reason, it insists on scanning my Linux partition, even if I create a custom scan targeting ony unit C:/. Also seems to lack configuration options (how to treat detected threats, PUPs, what actions to take automatically and which ones to leave to the user to decide). Maybe it's just what I'm used to, but I'm not liking it at all and considering uninstalling it and replacing with KAV. I don't mean to bash Bitsy here, but I guess I kind of am: Avast was always, in my experience, much more stable and feature-rich, and more effective at proactive prevention (except when it wasn't), so I guess I miss Avast's approach, while at the same time I've come to see that beyond my fondness, it's not really that great a security suite.
Am going to give KAV a try. II've used it in the past, but back in the day, always ended up reverting back to ESET (probably something to do with configuration options and UI. KAV has always has a pretty solid reputation for doing a good job at what it does).
My other main contender is Qihoo 360, but I've read a few articles on backdoors, and am uncertain whether it's the Chinese government actually stealing data (which would make sense when you consider their grasp on the Chinese market, from web browsers to AV software to Android apps to smartphone partnerships...a bit big brother style if you ask me...) or western media bashing them 'cause their FREE solution has been stealing an incredibly high rate of market share. The corporate world is murky as hell...particularly the AV market.
Does anyone have any experience with it?
I know I've gone completely off-topic, but thought my experience might shed a little light on Avast and Bitdefender, both of which I'm a bit skeptical of ATM. I'd love to hear some more info on KAV, something elaborate that actually goes into why it's better (in people's opinion) that Bitdefender, beyond mere personal taste. I'll share my experience with it...as soon as I have one to share
But I think my main lesson here is (and I know you're all gonna hate me for this, but I can't help it, and I'm not being cute) : stay away from Windows. No viruses in Linux. No cracks that might contain 'em. No need for cracks, as there's a free alternative to pretty much every piece of Windows software out there. I hadn't had this kind of tech-related headache in years. In fact, I haven't had a "system crash" or even a mere program crash or error message in over a year. Now THAT is definitely something to think about...
Regardless of what I do AV-wise, from now on, if I do log into Windows for anything, I'll do it in airplane mode. Lesson learned