[metadata]
creation_date = "2020/11/29"
maturity = "production"
updated_date = "2021/05/10"

[rule]
author = ["Elastic"]
description = """
A scheduled task was created by a Windows script via cscript.exe, wscript.exe or powershell.exe. This can be abused by
an adversary to establish persistence.
"""
false_positives = ["Legitimate scheduled tasks may be created during installation of new software."]
from = "now-9m"
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "Scheduled Task Created by a Windows Script"
note = """## Triage and analysis

Decode the base64 encoded Tasks Actions registry value to investigate the task's configured action."""
risk_score = 47
rule_id = "689b9d57-e4d5-4357-ad17-9c334609d79a"
severity = "medium"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Persistence"]
type = "eql"

query = '''
sequence by host.id with maxspan = 30s
  [library where dll.name : "taskschd.dll" and process.name : ("cscript.exe", "wscript.exe", "powershell.exe")]
  [registry where registry.path : "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Schedule\\TaskCache\\Tasks\\*\\Actions"]
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1053"
name = "Scheduled Task/Job"
reference = "https://attack.mitre.org/techniques/T1053/"


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