Communication To Uncommon Destination Ports

Title: Communication To Uncommon Destination Ports
Status: test
Description:Detects programs that connect to uncommon destination ports
References:
  -https://docs.google.com/spreadsheets/d/17pSTDNpa0sf6pHeRhusvWG6rThciE8CsXTSlDUAZDyo
Author: Florian Roth (Nextron Systems)
Date: 2017-03-19
modified:2024-03-12
Tags:

• -'attack.persistence'
• -'attack.command-and-control'
• -'attack.t1571'

Logsource:

• category: network_connection
• product: windows

Detection:
  selection:
    Initiated: 'true'
    DestinationPort:
      -'8080'
      -'8888'

  filter_main_local_ranges:
    DestinationIp|cidr:
      -'127.0.0.0/8'
      -'10.0.0.0/8'
      -'172.16.0.0/12'
      -'192.168.0.0/16'
      -'169.254.0.0/16'
      -'::1/128'
      -'fe80::/10'
      -'fc00::/7'

  filter_optional_sys_directories:
    Image|startswith:
      -'C:\Program Files\'
      -'C:\Program Files (x86)\'

  condition:selection and not 1 of filter_main_* and not 1 of filter_optional_*
Falsepositives:
  -Unknown
Level: medium