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This is a Cortex-Responder intended to enrich events in TheHive with DHCP logs-info from ElasticSearch
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images Rename DHCPConf.PY to Jun 21, 2019
DHCP_Responder.json Update Jun 20, 2019


This is my attempt at enriching events in TheHive, with information from ElasticSearch.

Short intro

This responder was made with the purpose of helping correlate ip-addresses with hostnames in a large infrastructure, using dynamic DHCP.

Besides being able to fetch the relevant log-entries form our DHCP-logs in Elastic, This responder is also able to perform automatic enrichment of the event, Meaning, that the responder can create new observables, containing relevant info in the message-field.


When implementing this responder the following should be implemented in TheHive:

Datatype: hostname      (fqdn could be used instead as it already exist in TheHive, but this would require a few small changes to the responder)

CustomField: customer(string)   (used to define which ElasticSearch-index should be searched.)

CustomField: startTime(timestamp)  (Used to define the start of the time-period you want logs from. Default is - 24hours)

CustomField: endTime(timestamp)    (Used to define the end of the time-period you want logs from. Default is

CustomField: autoDHCPEnrichment(Boolean)    (Defines if Responder should perform automatic enrichment)

Furthermore your DHCP logs should adhere to the Elastic-Common-Schema.


This Responder works on case-artifacts and supports the following datatypes:

Ip-address (must be rfc1918 (LAN) compliant)



other(if using other, it is assumed that the observable is a hostname)

The analyst starts by adding the required customFields(Customer, startTime, endTime, autoDHCPEnrichment)

The analyst then run the Responder on (usually an Ip-address) observable

If autoDHCPEnrichment is set to false, the responder will only return a report looking something like this:

If autoDHCPEnrichment is set to true, the responder will create a new (hostname) observable per hostname returned from Elastic. These new observables, will also contain a small report in the messageField

The original (IP-address) observable will also be enriched with a small report in the messageField


I have tried to make the Responder somewhat modular, which means that it should be somewhat simple to expand with further information. For example, I have allready created a POC, where I do further enrichment to the hostname observables, by adding information from our CMDB (such as OS, LastLoggedOnUser, domain, manufactorer, mac, serial, etc.).

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