Potential Network Share Discovery

Elastic Stack Serverless Security

Adversaries may look for folders and drives shared on remote systems to identify sources of information to gather as a precursor for collection and identify potential systems of interest for Lateral Movement.

Rule type: eql

Rule indices:

winlogbeat-*
logs-windows.*
logs-system.security*

Severity: low

Risk score: 21

Runs every: 60m

Searches indices from: now-119m (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
Tactic: Collection
Rule Type: BBR
Data Source: System

Version: 106

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

		sequence by user.name, source.port, source.ip with maxspan=15s
 [file where event.action == "network-share-object-access-checked" and
  winlog.event_data.ShareName in ("\\\\*\\ADMIN$", "\\\\*\\C$") and
  source.ip != null and source.ip != "0.0.0.0" and source.ip != "::1" and source.ip != "::" and source.ip != "127.0.0.1"]
 [file where event.action == "network-share-object-access-checked" and
  winlog.event_data.ShareName in ("\\\\*\\ADMIN$", "\\\\*\\C$") and
  source.ip != null and source.ip != "0.0.0.0" and source.ip != "::1" and source.ip != "::" and source.ip != "127.0.0.1"]

	

Framework: MITRE ATT&CKTM

Tactic:
- Name: Discovery
- ID: TA0007
- Reference URL: https://attack.mitre.org/tactics/TA0007/
Technique:
- Name: Network Share Discovery
- ID: T1135
- Reference URL: https://attack.mitre.org/techniques/T1135/
Tactic:
- Name: Collection
- ID: TA0009
- Reference URL: https://attack.mitre.org/tactics/TA0009/
Technique:
- Name: Data from Network Shared Drive
- ID: T1039
- Reference URL: https://attack.mitre.org/techniques/T1039/