Windows System Network Connections Discovery

Elastic Stack Serverless Security

This rule identifies the execution of commands that can be used to enumerate network connections. Adversaries may attempt to get a listing of network connections to or from a compromised system to identify targets within an environment.

Rule type: eql

Rule indices:

• logs-endpoint.events.process-*

Severity: low

Risk score: 21

Runs every: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

• Domain: Endpoint
• OS: Windows
• Use Case: Threat Detection
• Tactic: Discovery
• Rule Type: BBR
• Data Source: Elastic Defend

Version: 4

Rule authors:

• Elastic

Rule license: Elastic License v2

process where event.type == "start" and
(
  process.name : "netstat.exe" or
  (
   (
    (process.name : "net.exe" or process.pe.original_file_name == "net.exe") or
    (
     (process.name : "net1.exe" or process.pe.original_file_name == "net1.exe") and
     not process.parent.name : "net.exe"
    )
   ) and process.args : ("use", "user", "session", "config") and not process.args: ("/persistent:*", "/delete", "\\\\*")
  ) or
  (process.name : "nbtstat.exe" and process.args : "-s*")
) and not user.id : "S-1-5-18"

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Discovery
  • ID: TA0007
  • Reference URL: https://attack.mitre.org/tactics/TA0007/

• Technique:

  • Name: System Network Connections Discovery
  • ID: T1049
  • Reference URL: https://attack.mitre.org/techniques/T1049/

• Technique:

  • Name: System Information Discovery
  • ID: T1082
  • Reference URL: https://attack.mitre.org/techniques/T1082/