how to write splunk query for watching abuse of a service account?

[lakshmikolli201]

Hello,

I want to write a detection for watching abuse of a service being used. How to do i start writing the logic. any help would be appreciated.
thank you.

[vikramyadav]

1. So the best practices for writing a query is not but at least you should know by which index you have to search for your events. Suppose let's take an example you have your events in index=abc
2. And then choose your source or sourcetype
3. Check events and search for field or a key word like in your case is "service"
4. List item and then try to frame query
5. Query will look like index=abc source=service_account service! =granted | table service

[lakshmikolli201]

Detection for abuse of service account being used

[starcher]

Rich is asking what do you mean by abuse?

Count of failures? Count of success? By source? Over a given time range? From a given source to a number of destinations in a given time window?

You always need to start with defining the criteria of what you mean when using terms like abuse, unusual, unexpected etc when creating detections. That drives what you do in SPL.

[lakshmikolli201]

Hi Rich,

Thanks for your response.

abuse means unusual authentications, interactive activity, suspicious processes. I would like to build detections for any of these terms. could you please suggest me how can I proceed further with this?

thank you,
Lakshmi

[richgalloway]

Check out the Splunk Security Essentials app (https://splunkbase.splunk.com/app/3435/).

[richgalloway]

Please explain what "abuse of service account" means to you.