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Splunk Cheatsheet
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Splunk Quick Cheat Sheet

DNS Lookup

| lookup dnslookup clientip as dest_ip OUTPUT clienthost as dest_host

DNS Independent IP Resolution

| inputlookup tHostInfo
| search src_ip=$IPADDRESS$ OR src_host=$HOSTNAME$

Event Frequency

| stats count by signature
    `comment("define varriables")`
| eval days = 10
| eval events_perShift = round(count / ((days * 24)/4),3)
| eval events_perDay = round(count / days,2)
| eval events_perWeek = round(count / (days / 7),2)
| sort - count
| fields - count days
| table signature events_perShift events_perDay events_perWeek
| addcoltotals labelfield=signature label=Total

Get the earliest and latest time for an observed field value

| stats earliest(_time) as firstTime latest(_time) as lastTime by dest
| eval firstTime=strftime(firstTime,"%Y-%m-%d %H:%M:%S")
| eval lastTime=strftime(lastTime,"%Y-%m-%d %H:%M:%S")

List All Available Indexes with Events

| eventcount summarize=false index=*
| search count!=0
| dedup index
| fields - server

List All Available Non-Internal Indexes with Events

| eventcount summarize=false index=*
| search count!=0  NOT index IN (audit_summary, cim_modactions, endpoint_summary, lastchanceindex, notable, notable_summary, risk, summary, tc_app_logs, threat_activity)
| dedup index
| fields - server

List All Available Sourcetypes in an Index

| metadata type=sourcetypes index=foo
| eval firstTime=strftime(firstTime,"%Y-%m-%d %H:%M:%S")
| eval lastTime=strftime(lastTime,"%Y-%m-%d %H:%M:%S")
| eval recentTime=strftime(recentTime,"%Y-%m-%d %H:%M:%S")

Better FieldSummary with Event Coverage

index=pa_log sourcetype="pan:traffic" | fieldsummary
| eventstats max(count) as total
| eval event_coverage = round(((count / total)*100),2)."%"

Lower case all fields

| foreach "*" [eval <<FIELD>>=lower('<<FIELD>>') ]

Make time human readable

eval mytime=strftime(_time,"%Y-%m-%d %H:%M:%S")

Remove Domain from Device

|rex field=dest "^(?<dest>.*?)[\.|$]"

**Normalize User Field from WinEventlog

| eval user=lower(if(match(user,".*\\\\.*"), replace(user,".*\\\\",""), user)),

Get current user context

| rest /services/authentication/current-context splunk_server=loacal

Group By Octet
2 Octets

| rex field=src_ip "(?<subnet>\d+\.\d+)+\.\d+\.\d+"
| stats count by subnet

3 Octets

| rex field=ip "(?<subnet>\d+\.\d+\.\d+)\.\d+"
| stats count by subnet

Use of now

| eval yesterday=relative_time(now(), "-1d@d")

Turn a field into csv format

| fields mv_foo
| mvcombine mv_foo delim=","
| nomv mv_foo

Turn a field into csv format 2

| fields mv_foo
| eval mf_foo_csv = mvjoin(mv_foo,", ")

Expand multivalued field

| fields foo
| mvcombine foo delim=","
| nomv foo

Sankey Multistaged
2 staged

| table src_ip dest_port dest_ip
| appendpipe [stats count by src_ip dest_port | rename src_ip as source, dest_port as target]
| appendpipe [stats count by dest_port dest_ip | rename dest_port as source, dest_ip as target]
| search source=*
| fields source target count

3 staged

| table src_ip signature category dest_ip
| appendpipe [stats count by src_ip signature | rename src_ip as source, signature as target]
| appendpipe [stats count by signature category | rename signature as source, category as target]
| appendpipe [stats count by category dest_ip | rename category as source, dest_ip as target]
| search source=*
| fields source target count

Search time in a lookup
Incident Review is used as an example

| inputlookup incident_review_lookup
| addinfo
| eval yesterday=relative_time(now(), "-1d@d")
| where (time >= yesterday AND time <= info_max_time)

Find hosts that haven not checked in in a specified amount of time

| stats latest(_time) as lastTime earliest(_time) as firstTime by hostnames
    `comment("change the "-30d" to choose a date that we haven't seen assets check in by")`
| eval recent = if(lastTime > relative_time(now(),"-30d"),1,0), realLatest = strftime(latest,"%c")
| eval firstTime=strftime(firstTime,"%Y-%m-%d %H:%M:%S")
| eval lastTime=strftime(lastTime,"%Y-%m-%d %H:%M:%S")
| where recent=0

Join

search | join type=inner
| join type=left max=0 
| join type=inner overwrite=false genre_id
[| {​​​search}​​​​​​​​​​ | rename id as genre_id ]

CPE Extraction

.... spl filtering
| dedup agent_names
| fields installed_software{} agent_names sourcetype
| rename installed_software{} as installed_software
| mvexpand installed_software
| eval installed_software1 = split(installed_software,":")
| eval vendor = mvindex(installed_software1,2)
| eval product = mvindex(installed_software1,3)
| eval version = mvindex(installed_software1,4)
| eval service_pack = mvindex(installed_software1,5)
| rename installed_software as cpe
| table agent_names product vendor version service_pack cpe