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How to create Splunk query to validate missing Domain Controller security log events?

rhysbee
New Member

As we are using the AD Domain Controller security logs for audit purposes, we want a query to validate there are no missing Security events.

We created the following query which works for a single DC/short time period ok:
index=dcsecurity host=********DC1 earliest="12/1/2017:06:30:00" latest="12/1/2017:14:30:00"
| sort 0 EventRecordID | delta EventRecordID as id_diff | search id_diff>1
| eval FirstMissingEvent=EventRecordID-id_diff+1 | eval LastMissingEvent=EventRecordID-1
| eval Time=strftime(_time, "%d/%m/%Y %l:%M:%S %p")
| table host,Time,EventRecordID,id_diff,FirstMissingEvent,LastMissingEvent

alt text

This was run for a period we know there were some missing events and show exactly which EventRecordID's are missing, along with DC server name, time, how many records are missing and the first/last missing EventRecordID numbers.

Can someone help to create a similar script which can be run using foreach command or similar?
We would like to run a single query instead of separately for each DC server (we have > 15 DC's to check).
Looking at running over historic events in the "dcsecurity" index and saving results to a separate "dcsecurity_delta" summary index.
This will take considerable time to run, so any suggestions on streamlining the query or scheduling would be appreciated

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