Hi, I've followed the steps for combating Cryptolocker with VSE and am doing the same for HIPS IAW the Combating_Ransomware_RevH.pdf document. One question I have is that signature 3894 is disabled by default and requires enabling. I know that there will be quite a bit of logging when this signature is enabled. With signatures 6010 ad 6011 enabled what is the main purpose of enabling 3894? Thanks very much.
It looks like they are trying to make a defense in depth strategy here. Different Cryptolocker versions behave differently and this tool cannot block the kind of things that would make such a signature high fidelity. Turning these rules on is more like a chemo therapy approach.
Depending on your intended level of administration for each rule, turning any of these on in block mode could be a bad time for you. You'll spend a lot of time whitelisting application that these rules would end up blocking. They cast a wide net. If your network is small enough and has a uniform set of systems, this may be a good approach though.