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Description

This search looks for registry activity associated with modifications to the registry key HKLM\SYSTEM\CurrentControlSet\Control\Print\Monitors. In this scenario, an attacker can load an arbitrary .dll into the print-monitor registry by giving the full path name to the after.dll. The system will execute the .dll with elevated (SYSTEM) permissions and will persist after reboot.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel:
  • Last Updated: 2020-11-23
  • Author: Bhavin Patel, Splunk
  • ID: f5f6af30-7ba7-4295-bfe9-07de87c01bbc

ATT&CK

ID Technique Tactic
T1547.010 Port Monitors Persistence, Privilege Escalation

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Registry where Registry.action=modified AND Registry.registry_path="*CurrentControlSet\\Control\\Print\\Monitors*" by Registry.dest, Registry.registry_key_name Registry.user Registry.registry_path Registry.registry_value_name Registry.action 
| `drop_dm_object_name(Registry)` 
| `monitor_registry_keys_for_print_monitors_filter`

Associated Analytic Story

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 via other endpoint data sources, such as Sysmon. The data used for this search is typically generated via logs that report registry modifications.

Required field

  • _time
  • Registry.action
  • Registry.registry_path
  • Registry.dest
  • Registry.registry_key_name
  • Registry.user
  • Registry.registry_value_name

Kill Chain Phase

  • Actions on Objectives

Known False Positives

You will encounter noise from legitimate print-monitor registry entries.

RBA

Risk Score Impact Confidence Message
64.0 80 80 New print monitor added on $dest$

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

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