topic Re: How to generate a search to find persistent connections between client workstations to the internet? in Splunk Search

How to generate a search to find persistent connections between client workstations to the internet?

pdumblet — Tue, 07 Mar 2017 21:01:32 GMT

I have squid proxy log that I want to mine for persistent connections from my client workstations to the internet (ie: teamviewer, gotomypc, spyware C&C, etc).

Looking to do a search to determine if clients connect to the same URL or IP address during each 1 hour period of the prior 24 hours.

I have started with this search:

index=proxy | bucket _time span=1h | stats count by _time,user,url | sort - user

Which gives me a list of all urls by user by count, I think I need to then search this query for all occurrences by user by hour for each URL to determine if they are in all 24 hour periods.

Suggestions? Thoughts? Thanks

Re: How to generate a search to find persistent connections between client workstations to the internet?

somesoni2 — Tue, 07 Mar 2017 22:41:11 GMT

Give this a try. This will give your all users and hours and url for last 24 hrs where a user-url combination did not appear for all 24 hrs.

index=proxy  earliest=-24h@h latest=@h | bucket _time span=1h | stats count by _time,user,url  | eventstats dc(_time) as totalHours by user,url | where totalHours<24

Re: How to generate a search to find persistent connections between client workstations to the internet?

woodcock — Fri, 10 Mar 2017 00:49:09 GMT

You were so close; run your search for Last 24 hours and tack this onto the end of it:

| eventstats count(eval(count>0)) AS hours_non_zero BY user url | search hours_non_zero>=24

Re: How to generate a search to find persistent connections between client workstations to the internet?

woodcock — Fri, 10 Mar 2017 00:49:57 GMT

I think your < should be a =, right?