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linux_ssh_remote_services_script_execute.yml
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linux_ssh_remote_services_script_execute.yml
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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 for Linux EventID 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