topic Re: Adding a field from workflow in Alerting

Adding a field from workflow

a_n — Fri, 10 Sep 2021 08:46:12 GMT

Hi,

I have a firewall log in which some of the destinations do not have SNI, but I have their IPs.

I want to create/extract a new field from destination to get the destination details, for example the Resolve Host or the Organization.

Can someone please advise if this is possible and how?
Thank you in advance.

Re: Adding a field from workflow

isoutamo — Fri, 10 Sep 2021 09:05:58 GMT

Hi
I think that this can do. Can you post sample events which you have?
r. Ismo

Re: Adding a field from workflow

a_n — Fri, 10 Sep 2021 09:35:39 GMT

Hello ,

search is like:

index=FW
|stats count by Src,Dst,sni

results are like:

192.168.1.12 2.23.259.24 assets.msn.com

192.168.1.20 3.68.77.130

in the second row, the sni is empty. using a workflow, I can get the info of this IP (Amazon Technologies) but I have 2 issues:
1- I just need to get back single field (for example: Organization)
2- I want to be able to have this field (result of the workflow OR kind of External web lookup!) available in my reports and search results, like an extracted field.

Thank you in advance for your kind support.

Re: Adding a field from workflow

isoutamo — Fri, 10 Sep 2021 09:53:31 GMT

Basically there are two way to do it.

Lookup (file / kv store)
external command which do dns lookup

https://community.splunk.com/t5/Splunk-Search/DNS-Lookup-via-Splunk/td-p/72304

1st one needs that you are keeping up separate ip vs nsi mappings in csv file or in kvstore and update it regular base.

2nd one needs separate command to do it and if/when you have lot of IPs it could take a long time. You can start with this https://splunkbase.splunk.com/app/1535/

r. Ismo

Re: Adding a field from workflow

a_n — Fri, 10 Sep 2021 09:55:31 GMT

Thank you sir!