Mounting Hidden or WebDav Remote Shares

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: 21

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
Lateral Movement

Version: 4

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

edit

## 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

edit

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*"

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/
Sub-technique:
- Name: SMB/Windows Admin Shares
- ID: T1021.002
- Reference URL: https://attack.mitre.org/techniques/T1021/002/

« Execution via TSClient Mountpoint Incoming Execution via PowerShell Remoting »