Can you please provide a little more context? Let's start with which Cortex XDR license type(s) are you running?
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
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.
Could you create a BIOC rule like below.
REMOTE_PORT = 5355
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.
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