Sigma rule: Communication To Uncommon Destination Ports

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-328a88ebae5e, updated 2024-03-12T00:00:00.000Z.

Rule

Title
Communication To Uncommon Destination Ports
Status
test
Level
medium
Author
Florian Roth (Nextron Systems)
Date
2017-03-19
Modified
2024-03-12
File
rules/windows/network_connection/net_connection_win_susp_malware_callback_ports_uncommon.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects programs that connect to uncommon destination ports

Log source

product
windows
category
network_connection

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_*

False positives (as the rule lists them)

  • Unknown

Tags

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

MITRE ATT&CK ids this rule names

Related rules

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/network_connection/net_connection_win_susp_malware_callback_ports_uncommon.yml

Sources and licences

  • SigmaHQ

    "Communication To Uncommon Destination Ports" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/network_connection/net_connection_win_susp_malware_callback_ports_uncommon.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Communication To Uncommon Destination Ports",
entity page, dataset version ref-328a88ebae5e, updated 2024-03-12T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/6d8c3d20-a5e1-494f-8412-4571d716cf5c (accessed 2026-11-03).
Underlying source: SigmaHQ rule 6d8c3d20-a5e1-494f-8412-4571d716cf5c, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.