Splunk Search

AnomaliDetection does not detect outlier data

ashishmgupta
Engager

In the below dataset, there are two different ISPs for the user from their usual ones.
NordVPN for John and Quadranet for Jill – but this search using anomalidetection is detecting only john’s but not Jill’s.
Any idea why and what is the better way to detect the ISP outlier?

source="isp_data2.csv"  index="test" sourcetype="csv"
| anomalydetection "ISP" "EmailAddress" action=annotate
| eval isOutlier = if(probable_cause != "", "1", "0")
| table "ISP" "EmailAddress", probable_cause, isOutlier
| sort 100000 probable_cause

 

 

EmailAddressISPtimestamp
john@example.comComcast1/1/2020
john@example.comComcast1/2/2020
john@example.comComcast1/3/2020
john@example.comComcast1/4/2020
john@example.comComcast1/5/2020
john@example.comComcast1/6/2020
john@example.comComcast1/7/2020
john@example.comComcast1/8/2020
john@example.comComcast1/9/2020
john@example.comComcast########
john@example.comComcast########
john@example.comComcast########
john@example.comComcast########
john@example.comNordVPN########
john@example.comComcast########
john@example.comComcast########
john@example.comComcast########
john@example.comComcast########
john@example.comComcast########
john@example.comComcast########
john@example.comComcast########
john@example.comComcast########
john@example.comComcast########
jill@example.comSpectrum2/1/2020
jill@example.comSpectrum2/2/2020
jill@example.comSpectrum2/3/2020
jill@example.comSpectrum2/4/2020
jill@example.comSpectrum2/5/2020
jill@example.comSpectrum2/6/2020
jill@example.comSpectrum2/7/2020
jill@example.comSpectrum2/8/2020
jill@example.comSpectrum2/9/2020
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comQuadranet########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum########
jill@example.comSpectrum3/1/2020
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