Detection rules › Kusto
New High Severity Vulnerability Detected Across Multiple Hosts
'This creates an incident when a new high severity vulnerability is detected across multilple hosts'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | T1190 Exploit Public-Facing Application |
Rule body kusto
id: 6116dc19-475a-4148-84b2-efe89c073e27
name: New High Severity Vulnerability Detected Across Multiple Hosts
description: |
'This creates an incident when a new high severity vulnerability is detected across multilple hosts'
severity: Medium
status: Available
requiredDataConnectors:
- connectorId: QualysVMLogsCCPDefinition
dataTypes:
- QualysHostDetection
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
relevantTechniques:
- T1190
query: |
let threshold = 10;
QualysHostDetection
| extend Status = tostring(Status), Vulnerability = tostring(QID), Severity = tostring(Severity)
| where Status =~ "New" and Severity == "5"
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), dcount(NetBios) by tostring(QID)
| where dcount_NetBios >= threshold
| extend timestamp = StartTime
version: 1.0.2
kind: Scheduled
Stages and Predicates
Parameters
let threshold = 10;
Stage 1: source
QualysHostDetection
Stage 2: extend
| extend Status = tostring(Status), Vulnerability = tostring(QID), Severity = tostring(Severity)
Stage 3: where
| where Status =~ "New" and Severity == "5"
Stage 4: summarize
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), dcount(NetBios) by tostring(QID)
Stage 5: where
| where dcount_NetBios >= threshold
Stage 6: extend
| extend timestamp = StartTime
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
Severity | eq |
|
Status | eq |
|
dcount_NetBios | ge |
|
Output fields
Fields the rule emits when it matches. Chronicle authors list these in the outcome block; they appear on the detection and $risk_score drives alerting. Sentinel / Defender XDR rules build them up through project / summarize / extend stages. Sentinel maps these into alert fields via entityMappings and customDetails; Defender XDR custom detections surface them as alert fields directly.
| Field | Source |
|---|---|
EndTime | summarize |
StartTime | summarize |
timestamp | extend |