TLS Certificate Hostname Mismatch

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Id	69761091-1a9a-49a9-8966-be68cd550766
Rulename	TLS Certificate Hostname Mismatch
Description	TLS Certificate Hostname Mismatch
Severity	Medium
Tactics	CredentialAccess DefenseEvasion Persistence
Techniques	T1556
Required data connectors	HVPollingIDAzureFunctions
Kind	Scheduled
Query frequency	5m
Query period	5m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CTM360/Analytic Rules/TLSCertificateHostnameMismatch.yaml
Version	1.0.3
Arm template	69761091-1a9a-49a9-8966-be68cd550766.json

KQL

HackerViewLog_Azure_1_CL | where severity_s == "medium" | where progress_status_s == "New" | where status_s != "inactive"  | where issue_name_s == "TLS Certificate Hostname Mismatch"

YAML

queryFrequency: 5m
eventGroupingSettings:
  aggregationKind: SingleAlert
id: 69761091-1a9a-49a9-8966-be68cd550766
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CTM360/Analytic Rules/TLSCertificateHostnameMismatch.yaml
query: 'HackerViewLog_Azure_1_CL | where severity_s == "medium" | where progress_status_s == "New" | where status_s != "inactive"  | where issue_name_s == "TLS Certificate Hostname Mismatch" '
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: meta_resolved_ip_s
  entityType: IP
- fieldMappings:
  - identifier: HostName
    columnName: meta_host_s
  entityType: Host
- fieldMappings:
  - identifier: Url
    columnName: hackerview_link_s
  entityType: URL
queryPeriod: 5m
kind: Scheduled
suppressionEnabled: false
status: Available
name: TLS Certificate Hostname Mismatch
triggerThreshold: 0
relevantTechniques:
- T1556
incidentConfiguration:
  groupingConfiguration:
    matchingMethod: AllEntities
    lookbackDuration: PT5H
    reopenClosedIncident: false
    enabled: false
  createIncident: true
requiredDataConnectors:
- connectorId: HVPollingIDAzureFunctions
  dataTypes:
  - HackerViewLog_Azure_1_CL
version: 1.0.3
severity: Medium
description: |
    'TLS Certificate Hostname Mismatch'
tactics:
- CredentialAccess
- DefenseEvasion
- Persistence
suppressionDuration: 5h

ARM