My Elastic Search Projects

 

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Project 1: Elasticsearch TLS Encryption HTTPS Communication

https://isc.sans.edu/forums/diary/Secure+Communication+using+TLS+in+Elasticsearch/26902/

This document is a compilation of the various references listed in this document; it combines all the necessary steps I used to setup TLS encryption. Using Elasticsearch elasticsearch-certutil self-signed certificate authority, it provides secure communication for Linux and Windows between Elasticsearch nodes, Kibana, logstash and the various beats.

The complete installation document TLS_elasticsearch_configuration.pdf is located here.

 

Project 2: Building IDS Sensor with Suricata & Zeek with Logs to Elasticsearch

Follow the steps listed in this document to build the sensor. This Internet Storm Center (SANS ISC) provides a summary to quickly install the sensor.

ISC Diary: https://isc.sans.edu/diary/27296

Installation Document : https://handlers.sans.edu/gbruneau/elk/Building_Custom_IDS_Sensor.pdf

The primary goal of this document is to provide a framework to build your own sensor(s) using CentOS 7 with Suricata and Zeek. It also has information to capture netflow data using softflowd. The two tarball listed below, are used to preconfigure the sensor after CentOS7 has been installed with the two /nsm partitions. It includes configuration scripts, startup scripts and some partly configure .yml files for filebeat, metricbeat and packetbeat.

Note: Modify both these tarball and adapt them for your local network.

References:

[1] https://handlers.sans.edu/gbruneau/scripts/installation.tgz

[2] https://handlers.sans.edu/gbruneau/scripts/sensor.tgz

 

Project 3: Pihole Configuration Files

 
Configure /etc/filebeat/filebeat.yml as follow:
 
filebeat.inputs:
 
- type: log
 enabled: true
 paths:
 - "/var/log/pihole.log"
 fields_under_root: true
 fields:
 region: Ottawa
 
output.logstash:
 hosts: ["127.0.0.1:5044"]
 
Download the following logstash script to send logs to ELK. Adjust your Elastic IP accordingly.
 
The pihole.conf file was updated using the Elastic Common Schema (ECS) Reference and the dashboard was updated accordingly.
 
Logstash Pihole parser (Updated 20 Feb 2020)
Pihole Dashboard (21 Feb 2020)
 
 
 

Project 4: tcp-honeypot Configuration Files

 
Configure /etc/filebeat/filebeat.yml as follow:
 
filebeat.inputs:
 
- type: log
 enabled: true
 paths:
 - "/opt/logs/tcp-honeypot-*.log"
 fields_under_root: true
 fields:
 region: Ottawa
 
output.logstash:
 hosts: ["127.0.0.1:5044"]
 
Download the following logstash.yml script to send logs to ELK. Adjust your Elastic IP accordingly. His honeypot script is located here.
 
Logstash tcp-honeypot (20 Jun 2020)
tcp-honeypot Dashboard (20 Jun 2020)

 

 

Project 5: Windows DHCP Server Logs Configuration Files

 

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Description automatically generated with low confidence

Note: See Post on https://isc.sans.edu/diary/27198

Configure /etc/filebeat/filebeat.yml as follow:

 

# This filebeat shipper is used with

# for Microsoft DHCP logs

 

# 9 Jan 2021

# Version: 1.0

 

filebeat.inputs:

 

# Filebeat input for Microsoft DHCP logs

 

- type: log

paths:

- "C:/Windows/System32/dhcp/DhcpSrvLog-*.log"

include_lines: ["^[0-9]{2},"]

fields_under_root: true

 

#==================== Queued Event ====================

#queue.mem:

# events: 4096

# flush.min_events: 512

# flush.timeout: 5s

 

#queue.disk:

# path: "/op/filebeat/diskqueue"

# max_size: 10GB

 

#==================== Output Event ====================

output.logstash:

hosts: ["192.168.2.23:5044"]

Download the following logstash script to send logs to ELK. Adjust your Elastic IP accordingly.
 
The logstash-filter-dhcp.conf file was updated using the Elastic Common Schema (ECS) Reference and the dashboard was updated accordingly.
 
Logstash Microsoft DHCP Parser (12 March 2021)
Microsoft DHCP Dashboard (12 March 2021)
Windows DHCP Template (10 September 2021)
Windows DHCP ILM Policy (10 September 2021)
 

Project 6: Windows DNS Server Logs Configuration Files

 

Note: See Post on https://isc.sans.edu/diary/27828

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Configure DNS to Generate logs - File-based DNS debug logging

Login Windows server and setup file-based DNS debug logging. Windows DNS Debug Logging is used to collect the logs. Queries are logged one per line. Enable DNS debug logging using these steps:

 

         Create directory: C:\DNSLogs

         Open the DNS Management console (dnsmgmt.msc).

         Right-click on the DNS Server name and choose Properties from the context menu.

         Under the Debug Logging tab, enable Log packets for debugging and configure as per picture below.

         File path and name: C:\DNSLogs\windns.log

         Maximum size (bytes): 5000000

         Apply the changes

         Verify the file C:\DNSLogs\windns.log is now receiving data

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Change the IP address in this file to the IP address (192.168.25.23) of the logstash service. Configure /etc/filebeat/filebeat.yml as follow:

 

# This filebeat shipper is used for 
# Microsoft DNS logs
 
# 9 Jan 2021
# Version: 1.0
 
filebeat.inputs:
 
# Filebeat input for Windows DNS logs
 
- type: log
 paths:
 - "C:/DNSLogs/windns.log"
 include_lines: ["^[0-9]{4}-"]
 fields_under_root: true
 
 
#==================== Queued Event ====================
#queue.mem:
# events: 4096
# flush.min_events: 512
# flush.timeout: 5s
 
#queue.disk:
# path: "/op/filebeat/diskqueue"
# max_size: 10GB
 
#==================== Output Event ====================
output.logstash:
 hosts: ["192.168.25.23:5044"]
 
Download the following logstash script to send logs to ELK. Adjust your Elastic IP accordingly.
 
This configuration file also contains the option of resolving the IP addresses to hostname and should be adjusted to reflect the local internal network. Edit logstash-filter-ms-dns.conf and change to the local network the 192.168.25:
 
# This filter drop internal domain and internal IP range with in-addr.arpa
# This reduce the amount of noise
filter {
 if [log][file][path] =~ "windns.log" {
 if [dns.question.name] =~ /168\.192\.in-addr\.arpa/ {
 drop {}
 }
 if [dns.question.name] =~ /erin\.ca/ {
 drop {}
 }
 }
}
 
 
# DNS lookup for dns.resolved_ip that start with 192.168.25
 
filter {
 if [log][file][path] =~ "windns.log" and [dns.resolved_ip] =~ /192\.168\.25/ {
 mutate {
 copy => { "dns.resolved_ip" => "source.registered_domain" }
 convert => { "geoip.postal_code" => "string" }
 # copy dns.question.name to related.host
 copy => { "dns.question.name" => "related.hosts" }
 }
 dns {
 reverse => [ "source.registered_domain" ]
 action => "replace"
 }
 }
}
 
The logstash-filter-ms-dns.conf file was updated using the Elastic Common Schema (ECS) Reference and the dashboard was updated accordingly.
 
Logstash Microsoft DNS Parser (10 September 2021)
Microsoft DNS Dashboard (10 September 2021)
Windows DNS Template (10 September 2021)
Windows DNS ILM Policy (10 September 2021)