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CYFIRMA - Attack Surface - Open Ports Medium Rule

Description

"This rule is triggered when CYFIRMA identifies open and publicly accessible ports on internet-facing assets. Exposed services may include SSH, RDP, HTTP, or other potentially sensitive ports, increasing the risk of unauthorized access, exploitation, or reconnaissance by threat actors. Monitoring open ports is critical to reducing the external attack surface and preventing misuse through brute force, service vulnerabilities, or protocol exploitation."

Rule type: Scheduled
Version: 1.0.1
Declared status: Available
Query frequency: 5m
Query period: 5m
Trigger: gt 0

Declared MITRE coverage

Declared sources

Metadata from the source file. No dependencies inferred from KQL.

Connectors

CyfirmaAttackSurfaceAlertsConnector

Data types

CyfirmaASOpenPortsAlerts_CL

KQL query

Original query, unchanged.

// Medium Severity - Open Ports Exposure Detected
let timeFrame = 5m;
CyfirmaASOpenPortsAlerts_CL
| where severity == 'High' and TimeGenerated between (ago(timeFrame) .. now())
| extend 
    Description=description, 
    FirstSeen=first_seen, 
    LastSeen=last_seen, 
    RiskScore=risk_score, 
    Domain=sub_domain, 
    TopDomain=top_domain, 
    NetworkIP=ip, 
    AlertUID=alert_uid, 
    UID=uid, 
    WebServer=web_server, 
    WebServerVersion=web_server_version, 
    OpenPorts=open_ports, 
    ProviderName='CYFIRMA', 
    ProductName='DeCYFIR/DeTCT'
| project
    TimeGenerated,
    Description,
    Domain,
    TopDomain,
    RiskScore,
    FirstSeen,
    LastSeen,
    NetworkIP,
    AlertUID,
    UID,
    WebServer,
    WebServerVersion,
    OpenPorts,
    ProductName,
    ProviderName

Declared entities

DNSHostIP

Source provenance

GitHub

Displayed values come from files in Azure/Azure-Sentinel. They describe the published template, not your workspace configuration.

File: Solutions/Cyfirma Attack Surface/Analytic Rules/ASOpenPortsMediumRule.yaml ↗
Commit: 9800e51 ↗
Source identifier: 9e18b6c3-d172-4bc6-a7d9-cc7b0a03a69e

Additional source files 2

Solutions/Cyfirma Attack Surface/Analytic Rules/ASOpenPortsMediumRule.yamlsource ↗Solutions/Cyfirma Attack Surface/Data/Solution_CyfirmaASAlerts.jsonsolution-membership ↗

GSTEP / CATALOG TRACKING

Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC

GSTEP sync dates, separate from the source content’s publication dates.