name: Linux SSH Remote Services Script Execute
id: aa1748dd-4a5c-457a-9cf6-ca7b4eb711b3
version: 1
date: '2023-03-03'
author: Michael Haag, Splunk
status: production
type: TTP
description: The following analytic identifies SSH being utilized to move laterally
  and execute a script or file on the remote host.
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.process_name=ssh
  Processes.process IN ("*oStrictHostKeyChecking*", "*oConnectTimeout*", "*oBatchMode*")
  AND Processes.process IN ("*http:*","*https:*") by Processes.dest Processes.user
  Processes.parent_process_name Processes.process_name Processes.process Processes.process_id
  Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)` | `linux_ssh_remote_services_script_execute_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: This is not a common command to be executed. Filter as needed.
references:
- https://redcanary.com/blog/lateral-movement-with-secure-shell/
tags:
  analytic_story:
  - Linux Living Off The Land
  asset_type: Endpoint
  confidence: 70
  impact: 80
  message: An instance of $process_name$ was identified on endpoint $dest$ by user
    $user$ attempting to move laterally and download a file.
  mitre_attack_id:
  - T1021.004
  observable:
  - name: user
    type: User
    role:
    - Victim
  - name: dest
    type: Hostname
    role:
    - Victim
  - 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: 56
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1021.004/atomic_red_team/linux-sysmon.log
    source: Syslog:Linux-Sysmon/Operational
    sourcetype: sysmon_linux
    update_timestamp: true