splunk-security_content/dev/endpoint/child_processes_of_spoolsv_exe.yml

name: Child Processes of Spoolsv exe
id: aa0c4aeb-5b18-41c4-8c07-f1442d7599df
version: 3
date: '2020-03-16'
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 Event ID 1
search:
  selection1:
    Image|endswith: regsvr32.exe
    ParentImage: spoolsv.exe
  condition: selection1
how_to_implement: You must be ingesting endpoint data that tracks process activity,
  including parent-child relationships from your endpoints to populate the Endpoint
  data model in the Processes node. The command-line arguments are mapped to the "process"
  field in the Endpoint data model. Update the `children_of_spoolsv_filter` macro
  to filter out legitimate child processes spawned by spoolsv.exe.
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:
  - Windows Privilege Escalation
  - Hermetic Wiper
  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
  risk_score: 25
  security_domain: endpoint