- Access exclusive content
- Connect with peers
- Share your expertise
- Find support resources
Enhanced Security Measures in Place: To ensure a safer experience, we’ve implemented additional, temporary security measures for all users.
08-13-2020 05:37 PM
Hello, I am new to Cortex XDR, I just installed it. I tried nbns spoofing on a pc with Cortex XDR and it did not stop or detect it. My previous test with Symantec was detected and stopped. Any thoughts on this?
08-17-2020 12:12 PM
Hi @tech_noob-
Can you please provide a little more context? Let's start with which Cortex XDR license type(s) are you running?
08-17-2020 12:38 PM
I am using XDR prevent currently. My vendor made an error we are supposed to get pro and I am waiting for the upgrade in the next week or so.
09-17-2020 04:23 PM
Im curious what was detected on the endpoint for symantec to identify it as malicious behavior and stop it?
My understanding is that responder is listening for those multicast queries from your endpoint and responding when received.
09-17-2020 05:32 PM
Yes, Symantec detected it and stopped it on the endpoint. We upgraded our Cortex to Pro and I will test again under Cortex Pro maybe it will detect it as BIOC on the endpoint. I will post the result.
09-28-2020 10:34 AM
Please comment when you have the results we have prevent and many of the web servers will not detect attacks at the network level with this protection
07-17-2021 06:43 AM
We now use Cortex XDR pro. We recently had had a pen test internal audit, XDR detected port scanning etc. but it did not detect kali linux responder/nbns spoofing. Security auditor captured hashes but luckily they were not able to crack them. I tried Kali responder running on a VM, I rebooted my endpoint with XDR pro on the same LAN, and I was able to capture some hash with responder. From the XDR logs I am having a hard time finding IOC/BIOC I can use to detect and prevent responder...any thoughts on this? Our pen tester said that since the responder is passive it will be hard to detect. - thanks
07-17-2021 07:19 AM
We now use XDR Pro. We recently had an internal pen test, XDR detected port scanning, etc., but it did not detect and prevent nbns spoofing with Kali responder, some hash was captured but luckily they were not able to crack them. I ran responder on the same lan where I have a windows 10 with XDR pro. I rebooted Windows 10 and I was able to capture hashes with Kali responder.
I looked a the XDR logs but I am having a hard time finding IOC/BIOC for detecting responder..any thoughts on this? Thanks.
07-19-2021 05:51 AM - edited 07-19-2021 08:25 AM
Hello Tech_noob
Could you create a BIOC rule like below.
REMOTE_PORT = 5355
PROTOCOL=UDP
Network = Incoming, outgoing
5355 is LLMNR port number and as you know that, if clients cannot find/resolve a remote host in DNS, starting to LLMNR query via multicast.
So, with this BIOC rule, You can detect LLMNR queried hosts and would be helpful to understand which process is responsible for the LLMNR.
with XDR you can control Windows Host firewall and block that UDP packages but from the security perspective (host hardening), Im gonna advise to use GPO for disabling LLMNR and Netbios name resolution.
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 LIVEcommunity as a whole!
The LIVEcommunity thanks you for your participation!