IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Windows Network Enumeration

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Windows Network Enumeration

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Identifies attempts to enumerate hosts on a network using the built-in Windows net.exe tool.

Rule type: eql

Rule indices:

logs-endpoint.events.*
winlogbeat-*
logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

Elastic
Host
Windows
Threat Detection
Discovery

Version: 5

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

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## Config

If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.

Rule query

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process where event.type in ("start", "process_started") and
  ((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 : "view" or (process.args : "time" and process.args : "\\\\*"))


  /* expand when ancestry is available
  and not descendant of [process where event.type == ("start", "process_started") and process.name : "cmd.exe" and
                           ((process.parent.name : "userinit.exe") or
                            (process.parent.name : "gpscript.exe") or
                            (process.parent.name : "explorer.exe" and
                               process.args : "C:\\*\\Start Menu\\Programs\\Startup\\*.bat*"))]
  */

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Discovery
- ID: TA0007
- Reference URL: https://attack.mitre.org/tactics/TA0007/
Technique:
- Name: Remote System Discovery
- ID: T1018
- Reference URL: https://attack.mitre.org/techniques/T1018/
Technique:
- Name: Network Share Discovery
- ID: T1135
- Reference URL: https://attack.mitre.org/techniques/T1135/

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