Windows Network Connections to Uncommon Ports (8080, 8888)

Flags Windows-initiated connections to ports 8080/8888 excluding private/local IPs and Program Files binaries.

FreeReviewedSigma · Medium · v2

Product: windows
Category: network_connection
Author: Florian Roth (Nextron Systems) (SigmaHQ), DRL 1.1
Published: 2017-03-19
Updated: 2026-07-31

ATT&CK techniques

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1571Non-Standard Port
Exfiltration
Impact

What it detects

This rule flags Windows processes that initiate network connections to destination ports 8080 or 8888 when the destination is not within common local/private and reserved IP ranges and the process image is not under standard Program Files directories. Uncommon service port communication can indicate command-and-control or persistence attempts, especially when directed to non-local targets. The detection relies on network connection telemetry with fields for whether the connection was initiated, destination IP, destination port, and the process image path.

Reporting behind it

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Windows Network Connections to Uncommon Ports (8080, 8888)

Pivot detection · T1571 · 7 related

Changelog

v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

windows-network-connections-to-uncommon-destination-ports-8080-8888-6d8c3d20

title: Windows Network Connections to Uncommon Ports (8080, 8888)
id: c0585dab-1d7f-422b-9da0-3137a45fd5c4
related:
  - id: 4b89abaa-99fe-4232-afdd-8f9aa4d20382
    type: similar
  - id: 6d8c3d20-a5e1-494f-8412-4571d716cf5c
    type: derived
status: test
description: This rule flags Windows processes that initiate network connections to destination ports 8080 or 8888 when the destination is not within common local/private and reserved IP ranges and the process image is not under standard Program Files directories. Uncommon service port communication can indicate command-and-control or persistence attempts, especially when directed to non-local targets. The detection relies on network connection telemetry with fields for whether the connection was initiated, destination IP, destination port, and the process image path.
references:
  - https://docs.google.com/spreadsheets/d/17pSTDNpa0sf6pHeRhusvWG6rThciE8CsXTSlDUAZDyo
  - https://github.com/SigmaHQ/sigma/blob/master/rules/windows/network_connection/net_connection_win_susp_malware_callback_ports_uncommon.yml
author: Florian Roth (Nextron Systems), Huntrule Team
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
license: DRL-1.1

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