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Description

Attempt To Add Certificate To Untrusted Store

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint- Datasource: Splunk Add-on for Sysmon
  • Last Updated: 2021-09-16
  • Author: Patrick Bareiss, Rico Valdez, Splunk
  • ID: 6bc5243e-ef36-45dc-9b12-f4a6be131159

Annotations

ATT&CK
ID Technique Tactic
T1553.004 Install Root Certificate Defense Evasion
T1553 Subvert Trust Controls Defense Evasion
Kill Chain Phase
  • Installation
  • Actions on Objectives
NIST
  • PR.PT
  • DE.CM
  • PR.IP
CIS20
  • CIS 3
  • CIS 5
  • CIS 8
CVE
1
2
3
4
5
6
| tstats `security_content_summariesonly` count min(_time) as firstTime values(Processes.process) as process max(_time) as lastTime from datamodel=Endpoint.Processes where `process_certutil` (Processes.process=*-addstore*) by Processes.dest Processes.user Processes.parent_process Processes.process_name Processes.process Processes.process_id Processes.parent_process_id 
| `drop_dm_object_name("Processes")` 
| `security_content_ctime(firstTime)` 
|`security_content_ctime(lastTime)` 
| `attempt_to_add_certificate_to_untrusted_store_filter`

Macros

The SPL above uses the following Macros:

Note that attempt_to_add_certificate_to_untrusted_store_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

  • _time
  • Processes.dest
  • Processes.user
  • Processes.parent_process_name
  • Processes.process_name
  • Processes.process
  • Processes.parent_process
  • Processes.process_id
  • Processes.parent_process_id

How To Implement

You must be ingesting data that records process activity from your hosts to populate the Endpoint data model in the Processes node. You must also be ingesting logs with both the process name and command line from your endpoints. The command-line arguments are mapped to the “process” field in the Endpoint data model.

Known False Positives

There may be legitimate reasons for administrators to add a certificate to the untrusted certificate store. In such cases, this will typically be done on a large number of systems.

Associated Analytic story

RBA

Risk Score Impact Confidence Message
35.0 70 50 An instance of $parent_process_name$ spawning $process_name$ was identified attempting to add a certificate to the store on endpoint $dest$ by user $user$.

Reference

Test Dataset

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

source | version: 7