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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Mounting Hidden or WebDav Remote Shares

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Mounting Hidden or WebDav Remote Shares

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Identifies the use of net.exe to mount a WebDav or hidden remote share. This may indicate lateral movement or preparation for data exfiltration.

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
Lateral Movement

Version: 101 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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process where event.type == "start" 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 : "use" and /*
including hidden and webdav based online shares such as onedrive */
process.args : ("\\\\*\\*$*", "\\\\*@SSL\\*", "http*") and /*
excluding shares deletion operation */ not process.args : "/d*"

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Lateral Movement
- ID: TA0008
- Reference URL: https://attack.mitre.org/tactics/TA0008/
Technique:
- Name: Remote Services
- ID: T1021
- Reference URL: https://attack.mitre.org/techniques/T1021/

Rule version history

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Version 101 (8.5.0 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 : "use" and /*
including hidden and webdav based online shares such as onedrive */
process.args : ("\\\\*\\*$*", "\\\\*@SSL\\*", "http*") and /*
excluding shares deletion operation */ not process.args : "/d*"

Version 6 (8.4.0 release)

Formatting only

Version 4 (8.2.0 release)

Formatting only

Version 3 (7.12.0 release)

Formatting only

Version 2 (7.11.2 release)

Formatting only

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