Windows Network Enumeration

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Windows Network Enumeration

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Identifies attempts to enumerate hosts in 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: 5 minutes

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

Maximum alerts per execution: 100

Tags:

Elastic
Host
Windows
Threat Detection
Discovery

Version: 4 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 7.15.0

Rule authors: Elastic

Rule license: Elastic License v2

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*"))] */

Threat mapping

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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/

Rule version history

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Version 4 (7.15.0 release)

Updated query, changed from:

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
ancestory 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*"))] */

Version 3 (7.12.0 release)

Formatting only

Version 2 (7.11.2 release)

Formatting only

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