Hi,
could an advanced malware mask itself with an antivirus logo and so when you click "ok/yes" you end up f*******g-up your system.
It is very unlikely that a malware is mimicking your antivirus logo. It is standard for security software to look for key words which may indicate that malware is mimicking it. Probably the way that malware could actually accomplish that would be by compromising your security directly. Unless you have critical information and activities such as online banking, I would not worry about it if I were you.
What checks can one do to ensure protection against this kind of malware masking ?
Automatic anti-virus and anti-spyware definition updating is the best way to prevent such an attack. Do at least a quick scan once per day and preferably a full scan every day. I recommend starting it as soon as you awake in the morning. By the time you are done getting breakfast and other activities, then a long scan would probably be done. Also, do not leave your computer connected to the internet when you are not using it. Do not visit risky websites such as adult only ones.
I have spent several years as an IT consultant and had to deal with all kinds of security issues, so this is good advice.
That's not the best way, that's the somewhat working crappy way "let the problem in, be paranoid, and when the problem is there fix it", the better way is to not do all that, not worry about it all the time, but do take the necessary precautions for the problem not to arise to begin with.
You don't get infected automagically, it can happen in a number of ways but they almost all boil down to "you screwed up".
1) By exploit
2) By running malicious code yourself
#1 can be fixed (except for 0 day exploits) by keeping your software and Windows up to date, simply set Windows update to run daily and download optional update as well as critical ones, don't ever worry about, just reboot when it asks you to, that's about 50% of all possible problems fixed just right there.
#2 is where your antivirus can save you, but it saves you when you screwed up, better yet is not to screw up and that's actually fairly easy:
- if you see a popup warning you that you have a virus IGNORE IT, most of the time it's an add trying to get you to download a virus, no virus will EVER let you know that it found something WITHIN a webpage, so if the window is "owned" by your browser (in the taskbar), IGNORE IT, if it's not, well ignore it anyway, most antivirus with default settings will take reasonable actions if you let them do without worrying about it and if you're following the advice, you shouldn't be getting a virus anyway.
- Only download what you need, and download it from the Publisher, if you're downloading you know is from Microsoft and it doesn't come from Microsoft.com, don't download it, period, this is how most people get infected, downloading things from third party websites that may not contain the original exe.
- Do not trust email, EVEN FROM YOUR FRIENDS! If they get infected by a virus that spreads by mail, you WILL receive an email from them (but sent by the virus), don't go thinking that just because an attachment comes from a friend, it actually comes from him, do not click any attachment you do not know about, if in doubt call your friend, you should never receive executables by mail and most email clients / servers filter it anyway.
- Do not run as administrator, but modern Windows versions handle that pretty fine with UAC, DO NOT DISABLE UAC, at least each time you get the popup you get to see the digital signature too, if a program comes from "unverified Publisher" or a Publisher that isn't the one you're expecting, refuse running it, it's the same for everything you download, it's tagged as coming from the net and won't run without the popup, it's there for your safety, if you just hit yet without reading, that safety is USELESS.
Just applying those simple tips should keep you virus free (if you know what you're doing you don't even need an antivirus for that matter).