topic Proper execution of subsearch help in Splunk Search

Proper execution of subsearch help

kelie — Fri, 19 Feb 2021 23:42:04 GMT

So here is my existing query as it runs now

I am not the original builder of this query but I am editing it.

these are normalized snort logs. Id like to return the top 20 signatures by source, while displaying source (src), count, country, dns rsolution (dnslookup) and signature (sigs)

There are signatures i want to completely exclude by (sig_id), and then there are signatures i would like to exclude where signature has specific src or cidr range. I seem to be creating unbalanced parenthesis when trying my boolean expressions or Wheres. Please assist

Re: Proper execution of subsearch help

to4kawa — Sat, 20 Feb 2021 01:37:21 GMT

sourcetype=snort ``` There is no need for sub-searching, since you end up searching for everything.``` | stats count, values(signature) as Sigs by src | sort 20 - count | lookup dnslookup clientip as src OUTPUT clienthost as DST_RESOLVED | iplocation src | fields src, count, Country, DST_RESOLVED, Sigs | mvexpand Sigs | search NOT [ | inputlookup Signatures.csv | rename Signatures as Sigs | format ] ``` exclude Sgnatures CSV ``` | rename src as "Source IP", count as Count, DST_RESOLVED as "DNS Resolution", Sigs as Signatures

Re: Proper execution of subsearch help

kelie — Mon, 22 Feb 2021 05:06:39 GMT

could you help me better understand the mvexpands ?

also i wouldnt need to import the signatures from a csv.

Re: Proper execution of subsearch help

to4kawa — Mon, 22 Feb 2021 09:21:04 GMT

| stats count, values(signature) as signature by src

This makes signature multi-values. mvexpand separetes them to single rows.

It's going to everyone, but I can't make queries without logs.

Re: Proper execution of subsearch help

kelie — Mon, 22 Feb 2021 20:16:02 GMT

im sorry. i did not have the full query. this is the one as it runs now

sourcetype=snort
NOT (signature_id=129:7:1 OR signature_id=124:1:1 OR signature_id=142:1:1 OR signature_id=124:7:1 OR signature_id=129:18:1 OR signature_id=129:8:1)
[search sourcetype=snort (signature!="(spp_sip)*" (src_ip!=10.10.21.11 AND signature!="*POP3*") AND (src_ip!=10.108.246.111 OR 10.108.243.112 OR 10.108.243.113 OR 10.108.243.114 OR 10.108.243.115 OR 10.108.243.116) AND signature_id!=125:1:1)
|top limit=20 src| table src]
| stats count, values(signature) as Sigs by src
| sort -count
| lookup dnslookup clientip as src OUTPUT clienthost as DST_RESOLVED
| iplocation src
| fields src, count, Country, DST_RESOLVED, Sigs
| rename src as "Source IP", count as Count, DST_RESOLVED as "DNS Resolution", Sigs as Signatures