[metadata]
creation_date = "2020/02/18"
maturity = "production"
updated_date = "2020/11/03"

[rule]
author = ["Elastic"]
description = """
This rule detects network events that may indicate the use of RDP traffic to the Internet. RDP is commonly used by
system administrators to remotely control a system for maintenance or to use shared resources. It should almost never be
directly exposed to the Internet, as it is frequently targeted and exploited by threat actors as an initial access or
back-door vector.
"""
false_positives = [
    """
    RDP connections may be made directly to Internet destinations in order to access Windows cloud server instances but
    such connections are usually made only by engineers. In such cases, only RDP gateways, bastions or jump servers may
    be expected Internet destinations and can be exempted from this rule. RDP may be required by some work-flows such as
    remote access and support for specialized software products and servers. Such work-flows are usually known and not
    unexpected. Usage that is unfamiliar to server or network owners can be unexpected and suspicious.
    """,
]
index = ["filebeat-*", "packetbeat-*", "logs-endpoint.events.*"]
language = "kuery"
license = "Elastic License"
name = "RDP (Remote Desktop Protocol) to the Internet"
risk_score = 21
rule_id = "e56993d2-759c-4120-984c-9ec9bb940fd5"
severity = "low"
tags = ["Elastic", "Host", "Network", "Threat Detection", "Initial Access"]
type = "query"

query = '''
event.category:(network or network_traffic) and network.transport:tcp and (destination.port:3389 or event.dataset:zeek.rdp) and
  source.ip:(
    10.0.0.0/8 or
    172.16.0.0/12 or
    192.168.0.0/16
  ) and
  not destination.ip:(
    10.0.0.0/8 or
    127.0.0.0/8 or
    169.254.0.0/16 or
    172.16.0.0/12 or
    192.168.0.0/16 or
    224.0.0.0/4 or
    "::1" or
    "FE80::/10" or
    "FF00::/8"
  )
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1190"
name = "Exploit Public-Facing Application"
reference = "https://attack.mitre.org/techniques/T1190/"


[rule.threat.tactic]
id = "TA0001"
name = "Initial Access"
reference = "https://attack.mitre.org/tactics/TA0001/"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1048"
name = "Exfiltration Over Alternative Protocol"
reference = "https://attack.mitre.org/techniques/T1048/"


[rule.threat.tactic]
id = "TA0010"
name = "Exfiltration"
reference = "https://attack.mitre.org/tactics/TA0010/"

