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How to process Cowrie output into Graylog

Prerequisites

Working Cowrie installation
Working Graylog installation

Cowrie Configuration

Open the Cowrie configuration file and uncomment these 3 lines.

[output_localsyslog]
facility = USER
format = text

Restart Cowrie

Graylog Configuration

Open the Graylog web interface and click on the System drop-down in the top menu. From the drop-down menu select Inputs. Select Syslog UDP from the drop-down menu and click the Launch new input button. In the modal dialog enter the following information.

Title: Cowrie Port: 8514 Bind address: 127.0.0.1

Then click Launch.

Syslog Configuration

Create a rsyslog configuration file in /etc/rsyslog.d

$ sudo nano /etc/rsyslog.d/85-graylog.conf

Add the following lines to the file

$template GRAYLOGRFC5424,"<%pri%>%protocol-version% %timestamp:::date-rfc3339% %HOSTNAME% %app-name% %procid% %msg%\n"
*.* @127.0.0.1:8514;GRAYLOGRFC5424

Save and quit.
Restart rsyslog

$ sudo service rsyslog restart