Alerting

How to create custom alert script to initiate tcpdump?

b_chris21
Communicator

Hello everyone,

I am trying to create a custom alert action where tcpdump capture will be triggered for the event's src and dest IPs.

I created a simple bash script for that: 

 

#!/bin/bash
#Initiate tcpdump (3 dumps for 5mins each)
tcpdump -i ens33 -G 300 -W 3 -w /mnt/nfs/pcaps/pcap-%Y-%m-%d_%H.%M.%S

 

My problem is that this does not contain the src and dest IPs of the correlation event triggered. How can I pass these variables here in order not to capture the whole traffic, but only the one related between these two hosts?

Thanks

Chris 

Labels (1)
0 Karma

schose
Builder

Hi,

The alert action script receives the configuration and results from the stdin in json format.. 

example:

{
"app": "search",
"owner": "admin",
"results_file": "heregoesthecreditcardnumber",
"results_link": "heregoesthecreditcardnumber",
"search_uri": "/servicesNS/nobody/search/saved/searches/testalert",
"server_host": "art-mb-2.local",
"server_uri": "heregoesthecreditcardnumber",
"session_key": "heregoesthecreditcardnumber",
"sid": "scheduler__admin__search__testalert_at_1569508320_128",
"search_name": "testalert",
"configuration": {
"email": "andreas at batchworks.de",
"company": "batchworks",
"severity": "WARNING"
},
"result": {
"sourcetype": "splunkd",
"count": "80"
}
}

in "result" there are your search results.. read this in python like: 

result = sys.stdin.read() settings = json.loads(result)regards,​
 

Andreas

0 Karma
Get Updates on the Splunk Community!

Improve Your Security Posture

Watch NowImprove Your Security PostureCustomers are at the center of everything we do at Splunk and security ...

Maximize the Value from Microsoft Defender with Splunk

 Watch NowJoin Splunk and Sens Consulting for this Security Edition Tech TalkWho should attend:  Security ...

This Week's Community Digest - Splunk Community Happenings [6.27.22]

Get the latest news and updates from the Splunk Community here! News From Splunk Answers ✍️ Splunk Answers is ...