[metadata]
creation_date = "2020/11/30"
maturity = "production"
updated_date = "2021/10/17"

[rule]
author = ["Elastic"]
description = "Identifies powershell.exe being used to download an executable file from an untrusted remote destination."
from = "now-9m"
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "Remote File Download via PowerShell"
risk_score = 47
rule_id = "33f306e8-417c-411b-965c-c2812d6d3f4d"
severity = "medium"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Command and Control"]
type = "eql"

query = '''
sequence by host.id, process.entity_id with maxspan=30s
  [network where process.name : ("powershell.exe", "pwsh.exe", "powershell_ise.exe") and network.protocol == "dns" and
   not dns.question.name : ("localhost", "*.microsoft.com", "*.azureedge.net", "*.powershellgallery.com", "*.windowsupdate.com", "metadata.google.internal") and 
   not user.domain : "NT AUTHORITY"]
    [file where process.name : "powershell.exe" and event.type == "creation" and file.extension : ("exe", "dll", "ps1", "bat") and 
   not file.name : "__PSScriptPolicy*.ps1"]
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1105"
name = "Ingress Tool Transfer"
reference = "https://attack.mitre.org/techniques/T1105/"


[rule.threat.tactic]
id = "TA0011"
name = "Command and Control"
reference = "https://attack.mitre.org/tactics/TA0011/"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"
[[rule.threat.technique.subtechnique]]
id = "T1059.001"
name = "PowerShell"
reference = "https://attack.mitre.org/techniques/T1059/001/"



[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"