Potential Outgoing RDP Connection by Unusual Process

[metadata]
creation_date = "2023/08/29"
integration = ["endpoint"]
maturity = "production"
updated_date = "2024/09/01"

[rule]
author = ["Elastic"]
building_block_type = "default"
description = """
Adversaries may attempt to connect to a remote system over Windows Remote Desktop Protocol (RDP) to achieve lateral
movement. Adversaries may avoid using the Microsoft Terminal Services Client (mstsc.exe) binary to establish an RDP
connection to evade detection.
"""
from = "now-119m"
index = ["logs-endpoint.events.network-*"]
interval = "60m"
language = "eql"
license = "Elastic License v2"
name = "Potential Outgoing RDP Connection by Unusual Process"
risk_score = 21
rule_id = "8e39f54e-910b-4adb-a87e-494fbba5fb65"
severity = "low"
tags = [
    "Domain: Endpoint",
    "OS: Windows",
    "Use Case: Threat Detection",
    "Tactic: Lateral Movement",
    "Data Source: Elastic Defend",
    "Rule Type: BBR"
]
timestamp_override = "event.ingested"
type = "eql"

query = '''
network where host.os.type == "windows" and
  event.action == "connection_attempted" and destination.port == 3389 and
  destination.ip != "::1" and destination.ip != "127.0.0.1" and
  not (
    process.executable : (
      "?:\\Windows\\System32\\mstsc.exe",
      "?:\\Program Files (x86)\\mRemoteNG\\mRemoteNG.exe",
      "?:\\Program Files (x86)\\PRTG Network Monitor\\PRTG Probe.exe",
      "?:\\Program Files\\Azure Advanced Threat Protection Sensor\\*\\Microsoft.Tri.Sensor.exe",
      "?:\\Program Files (x86)\\Microsoft\\Remote Desktop Connection Manager\\RDCMan.exe",
      "?:\\Program Files\\SentinelOne\\Sentinel Agent*\\Ranger\\SentinelRanger.exe",
      "?:\\Program Files\\Devolutions\\Remote Desktop Manager\\RemoteDesktopManager.exe",
      "?:\\Program Files (x86)\\Devolutions\\Remote Desktop Manager\\RemoteDesktopManager.exe"
    ) and process.code_signature.trusted == true
  )
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1021"
name = "Remote Services"
reference = "https://attack.mitre.org/techniques/T1021/"
[[rule.threat.technique.subtechnique]]
id = "T1021.001"
name = "Remote Desktop Protocol"
reference = "https://attack.mitre.org/techniques/T1021/001/"



[rule.threat.tactic]
id = "TA0008"
name = "Lateral Movement"
reference = "https://attack.mitre.org/tactics/TA0008/"