Sigma rule: Network Communication Initiated To Portmap.IO Domain

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-0386b8678fe5, updated 2024-05-31T00:00:00.000Z.

Rule

Title
Network Communication Initiated To Portmap.IO Domain
Status
test
Level
medium
Author
Florian Roth (Nextron Systems)
Date
2024-05-31
File
rules/windows/network_connection/net_connection_win_domain_portmap.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects an executable accessing the portmap.io domain, which could be a sign of forbidden C2 traffic or data exfiltration by malicious actors

Log source

product
windows
category
network_connection

Detection

selection:
    Initiated: 'true'
    DestinationHostname|endswith: '.portmap.io'
condition: selection

False positives (as the rule lists them)

  • Legitimate use of portmap.io domains

Tags

  • attack.t1041
  • attack.command-and-control
  • attack.t1090.002
  • attack.exfiltration

MITRE ATT&CK ids this rule names

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_domain_portmap.yml

Sources and licences

  • SigmaHQ

    "Network Communication Initiated To Portmap.IO Domain" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/network_connection/net_connection_win_domain_portmap.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: Network Communication Initiated To Portmap.IO Domain",
entity page, dataset version ref-0386b8678fe5, updated 2024-05-31T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/07837ab9-60e1-481f-a74d-c31fb496a94c (accessed 2026-11-03).
Underlying source: SigmaHQ rule 07837ab9-60e1-481f-a74d-c31fb496a94c, 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.