mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
ljstella
87 lines
3.5 KiB
YAML
87 lines
3.5 KiB
YAML
name: Linux SSH Remote Services Script Execute
|
|
id: aa1748dd-4a5c-457a-9cf6-ca7b4eb711b3
|
|
version: 3
|
|
date: '2024-08-16'
|
|
author: Michael Haag, Splunk
|
|
status: production
|
|
type: TTP
|
|
description: The following analytic detects the use of SSH to move laterally and execute
|
|
a script or file on a remote host. It leverages data from Endpoint Detection and
|
|
Response (EDR) agents, focusing on specific SSH command-line parameters and URLs.
|
|
This activity is significant as it may indicate an attacker attempting to execute
|
|
remote commands or scripts, potentially leading to unauthorized access or control
|
|
over additional systems. If confirmed malicious, this could result in lateral movement,
|
|
privilege escalation, or the execution of malicious payloads, compromising the security
|
|
of the network.
|
|
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:
|
|
- Attacker
|
|
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
|