MISP Integration Error: While running custom-misp -> integrations. Output: IndexError: list index out of range

[Palak Chopra]

I'm trying to integrate MISP to check for malicious domains in email.

I've used this script: custom-misp

And added postfix as one of the groups to run this integration script.

However, when a postfix alert is generated, I receive this error in ossec.logs:

2024/09/30 18:34:38 wazuh-integratord: ERROR: Exit status was: 1
2024/09/30 18:34:39 wazuh-integratord: ERROR: Unable to run integration for custom-misp -> integrations
2024/09/30 18:34:39 wazuh-integratord: ERROR: While running custom-misp -> integrations. Output: IndexError: list index out of range
 

This is triggered by the line: 

alert_file = open(sys.argv[1])

Postfix rules:

<group name="postfix,">
    <!-- Rule to capture the first log entry with a specific queue ID -->
    <rule id="100001" level="12">
        <decoded_as>postfix</decoded_as>
        <description>Initial Postfix log entry with q ID</description>
        <group>postfix,</group>
        <!--match>q_id=.*</match-->
        <!--field name="q_id">^(.+)$</field> <!-- Match queue_id -->
        <!--options>no_full_log</options-->
        <!-- Save this field to use in correlation -->
    </rule>

    <!-- Rule to capture subsequent log entries with the same queue ID -->
    <rule id="100002" level="12">
        <decoded_as>postfix</decoded_as>
        <if_matched_sid>100001</if_matched_sid>
        <description>Subsequent Postfix log entries for the same queue ID</description>
        <group>postfix,</group>
        <!--match>q_id=.*</match-->
        <!--field name="q_id">^(.+)$</field-->
        <same_id/>
        <!--options>no_full_log</options-->
    </rule>

</group>

[Federico Ramos]

Hi,

It seems that the script isn't receiving its first CLI argument when executed, can you show us the configuration section where you configured this integration? Also, which documentation/step did you follow to integrate this script?

Also, here is a small guide on how to integrate custom scripts: https://wazuh.com/blog/how-to-integrate-external-software-using-integrator/. Maybe this can help you with the setup.