Fileless Ransomware

This “extrac32.exe” is a windows file signed by Microsoft.
I don’t have any sample of the malware, but i think (my opinion=maybe),
that Comodo will see the action as a your trusted browser is trying to call a trusted signed microsoft program and it will allow it.

I don’t have any further knowledge about this…

This one is kind of easy to mitigate by patching this vulnerability CVE-2015-0016 (which is a basic registry edit) and patching Adobe Flash player vulnerabilities CVE-2015-0311 and CVE-2015-0313. The later is also easy as all you have to do is to enable autoupdate or download new version of the Flash Player.