Splunk Search

How to find values that are not in a summary index

mpasha
Path Finder

Good day,
I have sysmon information collected in an index called sysmon. I also have created a summary index "HASh256" of all hashes that are known to be good.

I'd like to write a search that shows me all the events that the hash is not found in the summary index. I was planning to use the join command but seems to join only works when you want to include results from the main search and the subsearch.
I want to exclude entries that are found in the subsearch.
How can I achieve that?

Appreciate any help.

0 Karma

jacobpevans
Motivator

You can just use | search NOT followed by a subsearch, e.g.

           | makeresults | eval Field=1
| append [ | makeresults |  eval Field=2 ]
| append [ | makeresults | eval Field=3 ]
| search NOT [ | makeresults | eval Field=2 ]

Or, in your case:

index=sysmon Field1=*
| search NOT [ | search index=HASH256 | dedup Field1 | fields Field1 ]
Cheers,
Jacob

If you feel this response answered your question, please do not forget to mark it as such. If it did not, but you do have the answer, feel free to answer your own post and accept that as the answer.
Get Updates on the Splunk Community!

NEW! Log Views in Splunk Observability Dashboards Gives Context From a Single Page

Today, Splunk Observability releases log views, a new feature for users to add their logs data from Splunk Log ...

Last Chance to Submit Your Paper For BSides Splunk - Deadline is August 12th!

Hello everyone! Don't wait to submit - The deadline is August 12th! We have truly missed the community so ...

Ready, Set, SOAR: How Utility Apps Can Up Level Your Playbooks!

 WATCH NOW Powering your capabilities has never been so easy with ready-made Splunk® SOAR Utility Apps. Parse ...