Network Communication Initiated To Portmap.IO Domain

Hunt Hypothesis

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

Detection Rule

Sigma (Original)

title: Network Communication Initiated To Portmap.IO Domain
id: 07837ab9-60e1-481f-a74d-c31fb496a94c
status: test
description: Detects an executable accessing the portmap.io domain, which could be a sign of forbidden C2 traffic or data exfiltration by malicious actors
references:
    - https://portmap.io/
    - https://github.com/rapid7/metasploit-framework/issues/11337
    - https://pro.twitter.com/JaromirHorejsi/status/1795001037746761892/photo/2
author: Florian Roth (Nextron Systems)
date: 2024-05-31
tags:
    - attack.t1041
    - attack.command-and-control
    - attack.t1090.002
    - attack.exfiltration
logsource:
    category: network_connection
    product: windows
detection:
    selection:
        Initiated: 'true'
        DestinationHostname|endswith: '.portmap.io'
    condition: selection
falsepositives:
    - Legitimate use of portmap.io domains
level: medium

KQL (Azure Sentinel)

imNetworkSession
| where NetworkDirection =~ "true" and DstHostname endswith ".portmap.io"

Required Data Sources

False Positive Guidance

• Legitimate use of portmap.io domains

MITRE ATT&CK Context

• Tactic: Command and Control
• Tactic: Exfiltration
• Technique: T1041 — T1041
• Technique: T1090.002 — T1090.002

References

• https://portmap.io/
• https://github.com/rapid7/metasploit-framework/issues/11337
• https://pro.twitter.com/JaromirHorejsi/status/1795001037746761892/photo/2
• SigmaHQ Rule