topic Re: Best way to exclude legitimate behaviours in Cortex XDR Discussions

Best way to exclude legitimate behaviours

BenHooper — Fri, 25 Sep 2020 15:46:47 GMT

When it comes to excluding legitimate behaviours from BIOC rules, as far as I can see, there are 3 options:

Modify the BIOC rule itself adding "not equal to" logic.
Add BIOC rule exclusion at https://<organisation>.xdr.eu.paloaltonetworks.com/rules/exceptions
Add incident / alert exclusion at https://<organisation>.xdr.eu.paloaltonetworks.com/exclusion

What is the recommended way and differences between these methods?

Thanks.

Re: Best way to exclude legitimate behaviours

BenHooper — Wed, 28 Oct 2020 11:35:17 GMT

While I'm awaiting a reply, just so others know, a side effect of modifying an existing BIOC rules is that a significant number of its alerts / incidents get re-created.

Re: Best way to exclude legitimate behaviours

DJohnson84 — Tue, 24 Nov 2020 13:05:58 GMT

BenHooper,

I'm not saying this is the "recommended" way for excluding legitimate behaviors, but what I have done so far.

When an alert is created, and verifying that it is legitimate, I add it as an alert exclusion.

The thought being that the alert exclusion would be a smaller print versus excluding the whole BIOC rule.

Hope that helps,

DJohnson84

Re: Best way to exclude legitimate behaviours

Balaraju — Fri, 04 Mar 2022 10:55:47 GMT

Hello In the second line above do you mean ' I add it as alert exclusion ' or ' I add it as alert exemption ' ?

Re: Best way to exclude legitimate behaviours

bbarmanroy — Mon, 07 Mar 2022 05:47:17 GMT

Hi @Balaraju both rule (alert) exceptions and alert exclusions exist in Cortex XDR.

When you exclude an alert, the alert will still be triggered by the agent and sent to XDR tenant. However, it will not be stitched into an incident. Here the action is performed by the XDR tenant. The alerts will appear in the Alerts table.

On the other hand, an alert exception will cause the alert not to be triggered by the agent. The action is performed by the agent.