child_processes_of_spoolsv_exe.yml

name: Child Processes of Spoolsv exe
id: aa0c4aeb-5b18-41c4-8c07-f1442d7599df
version: 3
date: '2023-04-14'
author: Rico Valdez, Splunk
status: experimental
type: TTP
description: This search looks for child processes of spoolsv.exe. This activity is
  associated with a POC privilege-escalation exploit associated with CVE-2018-8440.
  Spoolsv.exe is the process associated with the Print Spooler service in Windows
  and typically runs as SYSTEM.
data_source:
- Sysmon EventID 1
search: '| tstats `security_content_summariesonly` count values(Processes.process_name)
  as process_name values(Processes.process) as process min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name=spoolsv.exe
  AND Processes.process_name!=regsvr32.exe by Processes.dest Processes.parent_process
  Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)` | `child_processes_of_spoolsv_exe_filter` '
how_to_implement: The detection is based on data that originates from Endpoint Detection
  and Response (EDR) agents. These agents are designed to provide security-related
  telemetry from the endpoints where the agent is installed. To implement this search,
  you must ingest logs that contain the process GUID, process name, and parent process.
  Additionally, you must ingest complete command-line executions. These logs must
  be processed using the appropriate Splunk Technology Add-ons that are specific to
  the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
  data model. Use the Splunk Common Information Model (CIM) to normalize the field
  names and speed up the data modeling process.
known_false_positives: Some legitimate printer-related processes may show up as children
  of spoolsv.exe. You should confirm that any activity as legitimate and may be added
  as exclusions in the search.
references: []
tags:
  analytic_story:
  - Data Destruction
  - Hermetic Wiper
  - Windows Privilege Escalation
  asset_type: Endpoint
  confidence: 50
  cve:
  - CVE-2018-8440
  impact: 50
  message: tbd
  mitre_attack_id:
  - T1068
  observable:
  - name: user
    type: User
    role:
    - Victim
  - name: dest
    type: Hostname
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - Processes.process_name
  - Processes.process
  - Processes.parent_process_name
  - Processes.process_name
  - Processes.dest
  - Processes.parent_process
  - Processes.user
  risk_score: 25
  security_domain: endpoint