Help with my Query :)

Elastic Stack Kibana
1

Can anyone advise where im going wrong with my query ?

I am trying to achieve the following:
Generate an Alert whenever event.code 4648 is seen - with the only exception being to not alert if the winlog.event_data.SubjectUserName matches the winlog.event_data.TargetUsername field.

I have tried several variations of the following query, but i am still getting alerts whereby the Subject and Target user match for that windows event:

event.code:"4648" and (not winlog.event_data.SubjectUserName:* or not winlog.event_data.TargetUserName:* or not winlog.event_data.SubjectUserName == winlog.event_data.TargetUserName)

Appreciate any help, folks.

Thanks

2

Hi,

The not operator is negating the entire condition, which is not what you want.

Try this:

event.code:"4648" AND NOT (winlog.event_data.SubjectUserName: * AND winlog.event_data.TargetUserName: * AND winlog.event_data.SubjectUserName == winlog.event_data.TargetUserName)

Regards

3

Hi yago82, thanks for your suggestion; i see what you mean.

Unfortunately im still having no luck with your suggested query :frowning:
I have double and triple checked that ive got your query right, and also that the field values are the same in the activity that i want to exclude (subject and target user).

I may hav to explore other avenues of filtering this activity, annoyingly.

Really appreciate your help tho.

4

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