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

Announcements

ATTENTION Customers, All Partners and Employees: The Customer Support Portal (CSP) will be undergoing maintenance and unavailable on Saturday, November 7, 2020, from 11 am to 11 pm PST. Please read our blog for more information.

Reply
Highlighted
L4 Transporter

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

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

sinkhole.jpg

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 

 


Accepted Solutions
Highlighted
L3 Networker

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.

View solution in original post

Highlighted
L4 Transporter

@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-...

View solution in original post

Highlighted
L2 Linker

HI ,

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

 

 

Capture.PNG

 

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

 

 

 

Maybe it's helpful

View solution in original post

Tags (1)

All Replies
Highlighted
L3 Networker

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.

View solution in original post

Highlighted
L4 Transporter

@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-...

View solution in original post

Highlighted
L2 Linker

HI ,

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

 

 

Capture.PNG

 

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

 

 

 

Maybe it's helpful

View solution in original post

Tags (1)
Like what you see?

Show your appreciation!

Click Like if a post is helpful to you or if you just want to show your support.

Click Accept as Solution to acknowledge that the answer to your question has been provided.

The button appears next to the replies on topics you’ve started. The member who gave the solution and all future visitors to this topic will appreciate it!

These simple actions take just seconds of your time, but go a long way in showing appreciation for community members and the Live Community as a whole!

The Live Community thanks you for your participation!