topic Re: Whitelisting of Files in Cortex XDR Discussions

Whitelisting of Files

Shashanksinha — Mon, 12 Dec 2022 19:47:06 GMT

Hello,

We are running periodic scan on all endpoints . During this scan few files has been detected .We have got confirmation that some of the files are legitimate and it's being used in infra.

Can you please suggest in providing what is the best method to whitelist the safe and confirmed files .

Re: Whitelisting of Files

mavraham — Mon, 12 Dec 2022 21:59:15 GMT

Hi @Shashanksinha,

Thank you for writing to Live Community.

You would need to can create a malware profile and exclude specific files from scans. This page should guide you how to proceed.

Re: Whitelisting of Files

RamyashreeMada — Tue, 13 Dec 2022 11:46:02 GMT

Hello,

Thanks for your response.

As you mentioned to create malware profile and exclude specific files from scans, as we have multiple files present in different folders so it will be difficult to add every path with *. If we whitelist the file hash does this exclude from scans?

Re: Whitelisting of Files

mavraham — Tue, 13 Dec 2022 16:51:14 GMT

Yes, you can whitelist the file hash by going into Incident Response → Action Center → New Action – Add to allow list.
Please note that once the file changes (via updates for example) you will need to whitelist the new hash again.

If you know the signature of your verified software, you can also add the singer as a trusted signer when creating a new malware profile (the page I recommended in the above response).

Re: Whitelisting of Files

Shashanksinha — Wed, 14 Dec 2022 09:03:13 GMT

Hello,

Thanks for responding.

If we add the hash of the file in allow list .So does alerts/incidents excludes in the malware scan. .

As we are observing incidents/alerts for the files despite being in allow list.

Re: Whitelisting of Files

mavraham — Wed, 14 Dec 2022 12:10:37 GMT

Hi @Shashanksinha,

Please note that adding file hash to the allowlist will bypass the verdict of WF or local analysis, it will not prevent alerts generated by BTP rules, and alerts can still be triggered by child processes .

In case your alerts are triggered by BTP rules, you can add a Global Behavioral Threat Protection (BTP) Rule Exception.