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VNC (Virtual Network Computing) from the Internet

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VNC (Virtual Network Computing) from the Internet

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This rule detects network events that may indicate the use of VNC traffic from the Internet. VNC 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 backdoor vector.

Rule type: query

Rule indices:

  • packetbeat-*
  • auditbeat-*
  • filebeat-*
  • logs-network_traffic.*
  • logs-panw.panos*

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Tactic: Command and Control
  • Domain: Endpoint
  • Use Case: Threat Detection
  • Data Source: PAN-OS

Version: 105

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

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(event.dataset: network_traffic.flow or (event.category: (network or network_traffic))) and
  network.transport:tcp and destination.port >= 5800 and destination.port <= 5810 and
  not source.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
    192.0.0.0/24 or
    192.0.0.0/29 or
    192.0.0.8/32 or
    192.0.0.9/32 or
    192.0.0.10/32 or
    192.0.0.170/32 or
    192.0.0.171/32 or
    192.0.2.0/24 or
    192.31.196.0/24 or
    192.52.193.0/24 or
    192.168.0.0/16 or
    192.88.99.0/24 or
    224.0.0.0/4 or
    100.64.0.0/10 or
    192.175.48.0/24 or
    198.18.0.0/15 or
    198.51.100.0/24 or
    203.0.113.0/24 or
    240.0.0.0/4 or
    "::1" or
    "FE80::/10" or
    "FF00::/8"
  ) and
  destination.ip:(
    10.0.0.0/8 or
    172.16.0.0/12 or
    192.168.0.0/16
  )

Framework: MITRE ATT&CKTM

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