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CYFIRMA - Attack Surface - Cloud Weakness Medium Rule

Description

"This rule detects cloud storage buckets (e.g., AWS S3) that are publicly accessible without authentication. Such misconfigurations can lead to data exfiltration, compliance violations, and reputational damage. The detection is based on Cyfirma's Attack Surface Intelligence."

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

CyfirmaASCloudWeaknessAlerts_CL

KQL query

Original query, unchanged.

// Medium Severity - Attack Surface - Cloud Weakness - Unauthorized Public Cloud Storage Exposure Detected
let timeFrame = 5m;
CyfirmaASCloudWeaknessAlerts_CL
| where severity == 'High' and TimeGenerated between (ago(timeFrame) .. now())
| extend
    Description=description,
    FirstSeen=first_seen,
    LastSeen=last_seen,
    RiskScore=risk_score,
    Domain=asset_name,
    AlertUID=alert_uid,
    UID=uid,
    Source=source,
    SourceType=source_type,
    CreatedDate=created_date,
    Impact=impact,
    ProviderName='CYFIRMA',
    ProductName='DeCYFIR/DeTCT'
| project
    TimeGenerated,
    Description,
    Domain,
    RiskScore,
    FirstSeen,
    LastSeen,
    AlertUID,
    UID,
    Source,
    SourceType,
    CreatedDate,
    Impact,
    ProviderName,
    ProductName

Declared entities

DNS

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/ASCloudWeaknessMediumRule.yaml ↗
Commit: 9800e51 ↗
Source identifier: b8a3c5e2-04d5-4b61-9b62-b4f53a417f74

Additional source files 2

Solutions/Cyfirma Attack Surface/Analytic Rules/ASCloudWeaknessMediumRule.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.