name: Linux System Network Discovery
id: 535cb214-8b47-11ec-a2c7-acde48001122
version: 1
date: '2022-02-11'
author: Teoderick Contreras, Splunk
status: production
type: Anomaly
description: This analytic is to look for possible enumeration of local network configuration.
  This technique is commonly used as part of recon of adversaries or threat actor
  to know some network information for its next or further attack. This anomaly detections
  may capture normal event made by administrator during auditing or testing network
  connection of specific host or network to network.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    Image|endswith:
    - arp
    - ifconfig
    - ip
    - netstat
    - firewall-cmd
    - ufw
    - iptables
    - ss
    - route
  condition: selection1
how_to_implement: To successfully implement this search, you need to be ingesting
  logs with the process name, parent process, and command-line executions from your
  endpoints. If you are using Sysmon, you can use the Add-on for Linux Sysmon from
  Splunkbase.
known_false_positives: Administrator or network operator can execute this command.
  Please update the filter macros to remove false positives.
references:
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1016/T1016.md
tags:
  analytic_story:
  - Network Discovery
  - Industroyer2
  asset_type: endpoint
  confidence: 30
  impact: 30
  message: A commandline $process$ executed on $dest$
  mitre_attack_id:
  - T1016
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 9
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1016/atomic_red_team/linux_net_discovery/sysmon_linux.log
    source: Syslog:Linux-Sysmon/Operational
    sourcetype: sysmon_linux