IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Potential Outgoing RDP Connection by Unusual Process

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Potential Outgoing RDP Connection by Unusual Process

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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.

Rule type: eql

Rule indices:

logs-endpoint.events.network-*

Severity: low

Risk score: 21

Runs every: 60m

Searches indices from: now-119m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Lateral Movement
Data Source: Elastic Defend
Rule Type: BBR

Version: 4

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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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
  )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Lateral Movement
- ID: TA0008
- Reference URL: https://attack.mitre.org/tactics/TA0008/
Technique:
- Name: Remote Services
- ID: T1021
- Reference URL: https://attack.mitre.org/techniques/T1021/
Sub-technique:
- Name: Remote Desktop Protocol
- ID: T1021.001
- Reference URL: https://attack.mitre.org/techniques/T1021/001/

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