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The following analytic detects the creation of malformed Investigations in Splunk Enterprise Security (ES) versions lower than 7.1.2, which can lead to a denial of service (DoS). It leverages internal Splunk logs, specifically monitoring the splunkd_investigation_rest_handler with error statuses during investigation creation. This activity is significant as it can disrupt the functionality of the Investigations manager, hindering incident response efforts. If confirmed malicious, this could prevent security teams from accessing critical investigation data, severely impacting their ability to manage and respond to security incidents effectively.

  • Type: TTP
  • Product: Splunk Enterprise Security

  • Last Updated: 2024-05-25
  • Author: Rod Soto, Eric McGinnis, Chase Franklin
  • ID: 7f6a07bd-82ef-46b8-8eba-802278abd00e




ID Technique Tactic
T1499 Endpoint Denial of Service Impact
Kill Chain Phase
  • Actions On Objectives
  • DE.CM
  • CIS 10
`splunkd_investigation_rest_handler` method=put msg=*investigation* status=error 
| stats count min(_time) as firstTime max(_time) as lastTime by user host method msg 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `splunk_es_dos_investigations_manager_via_investigation_creation_filter`


The SPL above uses the following Macros:

:information_source: splunk_es_dos_investigations_manager_via_investigation_creation_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • method
  • msg
  • status
  • user

How To Implement

This search requires access to internal indexes. Only affects Splunk Enterprise Security versions lower than 7.1.2.

Known False Positives

The vulnerability requires an authenticated session and access to create an Investigation. It only affects the availability of the Investigations manager, but without the manager, the Investigations functionality becomes unusable for most users. This search gives the exact offending event.

Associated Analytic Story


Risk Score Impact Confidence Message
100.0 100 100 Denial of Service Attack against Splunk ES Investigation Manager by $user$

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.


Test Dataset

Replay any dataset to Splunk Enterprise by using our tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 2