Alerting

Creating a Splunk Alert off failed ssh pattern

technick
Explorer

Hi All...

I am trying to figure out how to generate a alert if the same IP address fails SSH authentication on multiple sources (hosts).

Example Data

Jun  5 08:26:55 clunker-aus sshd[4087]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=140.22.0.186  user=monitor
Jun  5 08:26:55 webserver-aus sshd[4089]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=140.22.0.186  user=root
Jun  5 08:26:55 server1 sshd[4090]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=140.22.0.186  user=root

How would I create an alert for a pattern matching this in lets say a 5 minute window against 3 or more hosts?

Thanks in advance 😃

Tags (4)
0 Karma

lguinn2
Legend

Try this search, where XYZ is the name of your sourcetype

sourcetype=XYZ "authentication failure"

Then save it as an alert with the following characteristics

  • choose Real-time search
  • Under "trigger condition," choose Number of hosts
  • Set "Greater than 2"
  • In "5 minutes"

Here are the docs: Define rolling-window alerts

0 Karma
Get Updates on the Splunk Community!

2024 Splunk Career Impact Survey | Earn a $20 gift card for participating!

Hear ye, hear ye! The time has come again for Splunk's annual Career Impact Survey!  We need your help by ...

Optimize Cloud Monitoring

  TECH TALKS Optimize Cloud Monitoring Tuesday, August 13, 2024  |  11:00AM–12:00PM PST   Register to ...

What's New in Splunk Cloud Platform 9.2.2403?

Hi Splunky people! We are excited to share the newest updates in Splunk Cloud Platform 9.2.2403! Analysts can ...