DNS Query Length Outliers - MLTK

Description

This search allows you to identify DNS requests that are unusually large for the record type being requested in your environment.

Content Mapping

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Use Case

Advanced Threat Detection

Category

Adversary Tactics,

Alert Volume

This search allows you to identify DNS requests that are unusually large for the record type being requested in your environment.

SPL Difficulty

None

Journey

Stage 3

MITRE ATT&CK Techniques

Application Layer Protocol

DNS

MITRE Threat Groups

APT18
APT39
APT41
Cobalt Group
FIN7
Ke3chang
OilRig
Tropic Trooper

Kill Chain Phases

Command and Control

   Help

DNS Query Length Outliers - MLTK Help

To successfully implement this search, you will need to ensure that DNS data is populating the NetworkResolution data model. In addition, the Machine Learning Toolkit (MLTK) version 4.2 or greater must be installed on your search heads, along with any required dependencies. Finally, the support search "Baseline of DNS Query Length - MLTK" must be executed before this detection search, because it builds a machine-learning (ML) model over the historical data used by this search. It is important that this search is run in the same app context as the associated support search, so that the model created by the support search is available for use. You should periodically re-run the support search to rebuild the model with the latest data available in your environment.\ This search produces fields (query,query_length,count) that are not yet supported by ES Incident Review and therefore cannot be viewed when a notable event is raised. These fields contribute additional context to the notable. To see the additional metadata, add the following fields, if not already present, to Incident Review - Event Attributes (Configure > Incident Management > Incident Review Settings > Add New Entry):\n1. Label: DNS Query, Field: query\ 1. \ 1. Label: DNS Query Length, Field: querylength\ 1. \ 1. Label: Number of events, Field: count\ Detailed documentation on how to create a new field within Incident Review may be found here: https://docs.splunk.com/Documentation/ES/5.3.0/Admin/Customizenotables#Add_a_field_to_the_notable_event_details

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