We recently discover that sometimes, ramdonly, host called "Windows7" trays to mount a shared folder from our fileserver/DC. We discover this because our SIEM correlated some events from de DCserver. Sadly this SIEM do not show us the Source IP Address so, we add a PAN in SPAM port mode to the switch to tray to capture the ms-smb fail logons.
We started by adding the default custome signature and setting up to triggers with 5 events in 120 seconds (just like the SIEM's alert) but that do not work. Now we are traying to make a custome signatere that triggers when any package with the string "jbonaldo" goes through the PAN (jbonaldo is the host name).
I already read the "creating customg signature rev b" and I can not find any reference to SMB2 for the context field, so i try to use the "unknown-req-tcp-payload". I also tray setting up the string in clear text and/or hexadecimal.
BTW, I already create a vulnerability profile and append that to the security rule (just to be clear :) )
what i am doing wrong?
Solved! Go to Solution.
Thank you for the packet capture.
I can confirm that we currently do not have a context available in the custom signature engine for the SMB hostname. If this is something you'd like to have added, you should reach out to your account team representative and file a feature request for inclusion in a future version.
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