Not sure is it the best place, because the solution I want to discuss not exactly extensions, at least most of them.
Anyway, I am comparing options for a solution that does ongoing scan of Magento website and detects there malware, injections, vulnerabilities, viruses.
So far I have found the next solutions
All they as I understand have server component that I should install to the server where Magento is hosted.
There is also an extension called Mage Fence
I am interested to hear feedback from people who used any of the solution above or substitutes - the good the bad and the ugly sides of using them