[metadata]
creation_date = "2021/03/15"
maturity = "production"
updated_date = "2021/05/10"

[rule]
author = ["Elastic"]
description = """
Identifies suspicious startup shell folder modifications to change the default Startup directory in order to bypass
detections monitoring file creation in the Windows Startup folder.
"""
from = "now-9m"
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "Suspicious Startup Shell Folder Modification"
note = """## Triage and analysis

Verify file creation events in the new Windows Startup folder location."""
risk_score = 73
rule_id = "c8b150f0-0164-475b-a75e-74b47800a9ff"
severity = "high"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Persistence"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
registry where
 registry.path : (
     "HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\User Shell Folders\\Common Startup",
     "HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Shell Folders\\Common Startup",
     "HKEY_USERS\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\User Shell Folders\\Startup",
     "HKEY_USERS\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Shell Folders\\Startup"
     ) and
  registry.data.strings != null and
  /* Normal Startup Folder Paths */
  not registry.data.strings : (
           "C:\\ProgramData\\Microsoft\\Windows\\Start Menu\\Programs\\Startup",
           "%ProgramData%\\Microsoft\\Windows\\Start Menu\\Programs\\Startup",
           "%USERPROFILE%\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup",
           "C:\\Users\\*\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup"
           )
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1547"
name = "Boot or Logon Autostart Execution"
reference = "https://attack.mitre.org/techniques/T1547/"
[[rule.threat.technique.subtechnique]]
id = "T1547.001"
name = "Registry Run Keys / Startup Folder"
reference = "https://attack.mitre.org/techniques/T1547/001/"



[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"