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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Downloaded Shortcut Files

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Downloaded Shortcut Files

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Identifies .lnk shortcut file downloaded from outside the local network. These shortcut files are commonly used in phishing campaigns.

Rule type: eql

Rule indices:

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

Severity: low

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:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Execution

Version: 1

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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/* leaving in development pending `file.Ext.windows.zone_identifier` landing in ECS then endpoint */

sequence by process.entity_id with maxspan=2s
                                           /* file.extension added to endpoint fields for 7.10 */
  [file where host.os.type == "windows" and event.type == "creation" and file.extension == "lnk"]
                                           /* not sure yet how the update will capture ADS */
  [file where host.os.type == "windows" and event.type == "creation" and file.extension == "lnk:Zone.Identifier" and
     /* non-ECS field - may disqualify conversion */
     file.Ext.windows.zone_identifier > 1]

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: User Execution
- ID: T1204
- Reference URL: https://attack.mitre.org/techniques/T1204/
Sub-technique:
- Name: Malicious File
- ID: T1204.002
- Reference URL: https://attack.mitre.org/techniques/T1204/002/
Tactic:
- Name: Initial Access
- ID: TA0001
- Reference URL: https://attack.mitre.org/tactics/TA0001/
Technique:
- Name: Phishing
- ID: T1566
- Reference URL: https://attack.mitre.org/techniques/T1566/
Sub-technique:
- Name: Spearphishing Attachment
- ID: T1566.001
- Reference URL: https://attack.mitre.org/techniques/T1566/001/
Sub-technique:
- Name: Spearphishing Link
- ID: T1566.002
- Reference URL: https://attack.mitre.org/techniques/T1566/002/

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