[metadata]
creation_date = "2020/09/02"
integration = ["endpoint", "windows"]
maturity = "development"
query_schema_validation = false
updated_date = "2023/02/22"

[rule]
author = ["Elastic"]
description = """
Identifies .lnk shortcut file downloaded from outside the local network. These shortcut files are commonly used in
phishing campaigns.
"""
from = "now-9m"
index = ["logs-endpoint.events.*", "winlogbeat-*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "Downloaded Shortcut Files"
risk_score = 21
rule_id = "6b1fd8e8-cefe-444c-bc4d-feaa2c497347"
severity = "low"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Execution"]
type = "eql"

query = '''
/* 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]
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1204"
name = "User Execution"
reference = "https://attack.mitre.org/techniques/T1204/"
[[rule.threat.technique.subtechnique]]
id = "T1204.002"
name = "Malicious File"
reference = "https://attack.mitre.org/techniques/T1204/002/"



[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1566"
name = "Phishing"
reference = "https://attack.mitre.org/techniques/T1566/"
[[rule.threat.technique.subtechnique]]
id = "T1566.001"
name = "Spearphishing Attachment"
reference = "https://attack.mitre.org/techniques/T1566/001/"

[[rule.threat.technique.subtechnique]]
id = "T1566.002"
name = "Spearphishing Link"
reference = "https://attack.mitre.org/techniques/T1566/002/"



[rule.threat.tactic]
id = "TA0001"
name = "Initial Access"
reference = "https://attack.mitre.org/tactics/TA0001/"