Okay now let me chip in here shall we:
1) I am not impressed at all with the result to be honest.Let me tell you that this is not the first time avast's IDP has detected it late after it encrypted it.
2) The problem with late blocked has been reported and is under inspection by avast! team.Now lets come to the name of the review it says "Avast vs Ransomware" Now looking at this I will tell you that any regular watcher will think its avast (with all its shields) vs ransomware.
3) If you disable file shield you are cutting off avast! autosandbox tech too with evo--gen and filerep which are avast means of detecting malware.Avast by no means is a tradational AV:
Avast Technology
4) This does not reflect real world usage its just a test that pokes at IDP only.If you really have to test a AV against undetected Malware do it downloading a proper undetected malware from the actual source in presence of the AV in this case avast so it reflects real world and all avast shields come into play even cybercapture in this case since it will see it was downloaded from the internet.
There is really no need to take this or any test at face value its a small test of what IDP can do its not like it cannot completely block ransomwares it does done it many a times before in our malware hub tests it(IDP) blocked Wannacry before it could do any harm these are just one of those "misses".
Now from avast! team point of view,they don't necessarily feel IDP is a silver bullet it does have a lot of things in it to make it as bulletproof as possible as they don't consider it as bypass since their cloud and backend pick up on jaff and other ransomware quite,their cloud and evo-gen are really strong any tester at our malware hub will admit it.There is one another feature that is strictly coming to protect user data to get encrypted by ransom malware but I am not allowed to disclose it here.