splunk-security_content/detections/endpoint/windows_remote_assistance_spawning_process.yml

name: Windows Remote Assistance Spawning Process
id: ced50492-8849-11ec-9f68-acde48001122
version: 1
date: '2022-02-07'
author: Michael Haag, Splunk
status: production
type: TTP
description: The following analytic identifies the use of Microsoft Remote Assistance,
  msra.exe, spawning PowerShell.exe or cmd.exe as a child process. Msra.exe by default
  has no command-line arguments and typically spawns itself. It will generate a network
  connection to the remote system that is connected. This behavior is indicative of
  another process injected into msra.exe. Review the parent process or cross process
  events to identify source.
data_source:
- Sysmon Event ID 1
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
  as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name=msra.exe
  `windows_shells` by Processes.dest Processes.user Processes.parent_process_name
  Processes.process_name Processes.original_file_name Processes.process Processes.process_id
  Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)` | `windows_remote_assistance_spawning_process_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: False positives should be limited, filter as needed. Add additional
  shells as needed.
references:
- https://thedfirreport.com/2022/02/07/qbot-likes-to-move-it-move-it/
- https://app.any.run/tasks/ca1616de-89a1-4afc-a3e4-09d428df2420/
tags:
  analytic_story:
  - Unusual Processes
  asset_type: Endpoint
  confidence: 100
  impact: 80
  message: An instance of $parent_process_name$ spawning $process_name$ was identified
    on endpoint $dest$, generating behavior not common with msra.exe.
  mitre_attack_id:
  - T1055
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: parent_process_name
    type: Process
    role:
    - Parent Process
  - name: process_name
    type: Process
    role:
    - Child Process
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - _time
  - Processes.dest
  - Processes.user
  - Processes.parent_process_name
  - Processes.parent_process
  - Processes.original_file_name
  - Processes.process_name
  - Processes.process
  - Processes.process_id
  - Processes.parent_process_path
  - Processes.process_path
  - Processes.parent_process_id
  risk_score: 80
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1055/msra/msra-windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog