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Threat Feed - DNS Response blocked - how to find the original host requested

Case:

Client with Sophos Endpoint does DNS Request to XGS as resolver

DNS Response IP is seen in a 3rd Party Threat Feed

Firewall generated ATP Alert and sends red Heartbeat to Sophos Central

The Client is isolated by Sophos Central.

Now, how can I find out which hostname the client requested in DNS request? The IP is from a huge Google IP List.

The firewall is not logging DNS requests unfortunately.

Datalake Query was not bringing expected results.



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[edited by: Raphael Alganes at 2:15 PM (GMT -8) on 7 Jan 2025]
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