How do I identify which PC made a suspicious DNS query?

[SOC_CSG]

Hello

I have setup the Anti-Spyware Profile in our firewall and I have a lot of threat logs of type spyware suspicious DNS  queries from a domain controller machine and this is cleansed.

Monitor > Logs > Threat list

As you can see I have configured the sinkhole method. But I woluld like to know how could I identify which PC are making this suspicious DNS queries?

Thks

Diego 

[gtomte · Accepted solution]

You have to look for traffic towards the sinkhole IP in your traffic log, if it's configured as an IP outside the PC LAN.

[syadav · Accepted solution]

@SOC_CSG  You can create filter the traffic log for the DNS queries directed towards the Sinkhole address. You may create a report using traffic logs as well :

https://www.paloaltonetworks.com/documentation/61/pan-os/pan-os/threat-prevention/identify-infected-...

[gombodorj · Accepted solution]

HI ,

I think that you should configure fake ip address on sinkhole ipv4 field. That fake ip addressin not used inside of the network.

Then you need to have security rule that block all access to fake ip address .

Maybe it's helpful