EXPLORE
Sign In
← Back to Explore
sigmamediumHunting

Communication To Uncommon Destination Ports

Detects programs that connect to uncommon destination ports

MITRE ATT&CK

T1571
persistencecommand-and-control

Detection Query

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_*

Author

Florian Roth (Nextron Systems)

Created

2017-03-19

Data Sources

windowsNetwork Connection Events

Platforms

windows

References

Tags

attack.persistenceattack.command-and-controlattack.t1571
Raw Content
title: Communication To Uncommon Destination Ports
id: 6d8c3d20-a5e1-494f-8412-4571d716cf5c
related:
    - id: 4b89abaa-99fe-4232-afdd-8f9aa4d20382
      type: similar
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'  # IPv6 loopback
            - 'fe80::/10'  # IPv6 link-local addresses
            - 'fc00::/7'  # IPv6 private addresses
    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