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Description

The following analytic identifies a modification or registry add to the safeboot registry as an autostart mechanism. This technique is utilized by adversaries to persist a driver or service into Safe Mode. Two keys are monitored in this analytic, Minimal and Network. adding values to Minimal will load into Safe Mode and by adding into Network it will provide the service or drive the ability to perform network connections in Safe Mode.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Endpoint
  • Last Updated: 2022-03-31
  • Author: Teoderick Contreras, Michael Haag, Splunk
  • ID: c6149154-c9d8-11eb-9da7-acde48001122

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1547.001 Registry Run Keys / Startup Folder Persistence, Privilege Escalation
T1547 Boot or Logon Autostart Execution Persistence, Privilege Escalation
Kill Chain Phase
  • Exploitation
NIST
CIS20
CVE
1
2
3
4
5
6
7
8
| tstats `security_content_summariesonly` count from datamodel=Endpoint.Registry where Registry.registry_path IN ("*SYSTEM\\CurrentControlSet\\Control\\SafeBoot\\Minimal\\*","*SYSTEM\\CurrentControlSet\\Control\\SafeBoot\\Network\\*") by _time span=1h Registry.dest Registry.user Registry.registry_path Registry.registry_value_name Registry.process_guid Registry.registry_key_name Registry.registry_value_data 
| `drop_dm_object_name(Registry)` 
| join process_guid _time [
| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes by _time span=1h Processes.process_id Processes.process_name Processes.process Processes.dest Processes.process_guid 
| `drop_dm_object_name(Processes)`] 
| table _time dest user process_name process process_guid registry_path registry_value_name registry_value_data registry_key_name 
| `windows_registry_modification_for_safe_mode_persistence_filter`

Macros

The SPL above uses the following Macros:

:information_source: windows_registry_modification_for_safe_mode_persistence_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.

  • _time
  • Registry.registry_path
  • Registry.registry_key_name
  • Registry.registry_value_name
  • Registry.dest
  • Processes.process_id
  • Processes.process_name
  • Processes.process
  • Processes.dest
  • Processes.process_guid

How To Implement

To successfully implement this search, you must be ingesting data that records registry activity from your hosts to populate the endpoint data model in the registry node. This is typically populated via endpoint detection-and-response product, such as Carbon Black or endpoint data sources, such as Sysmon. The data used for this search is typically generated via logs that report reads and writes to the registry.

Known False Positives

updated windows application needed in safe boot may used this registry

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
42.0 60 70 Safeboot registry $registry_path$ was added or modified with a new value $registry_value_name$ on $dest$

: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.

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: 3