Mimecast Audit - Logon Authentication Failed | Microsoft Sentinel Analytic Rules

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Id	9c5dcd76-9f6d-42a3-b984-314b52678f20
Rulename	Mimecast Audit - Logon Authentication Failed
Description	Detects threat when logon authentication failure found in audit
Severity	High
Tactics	Discovery InitialAccess CredentialAccess
Techniques	T1110
Required data connectors	MimecastAuditAPI
Kind	Scheduled
Query frequency	5m
Query period	15m
Trigger threshold	3
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastAudit/Analytic%20Rules/MimecastAudit.yaml
Version	1.0.0
Arm template	9c5dcd76-9f6d-42a3-b984-314b52678f20.json

KQL

MimecastAudit_CL | where src_s !="" and auditType_s == "Logon Authentication Failed"

YAML

tactics:
- Discovery
- InitialAccess
- CredentialAccess
kind: Scheduled
triggerThreshold: 3
queryPeriod: 15m
query: MimecastAudit_CL | where src_s !="" and auditType_s == "Logon Authentication Failed"
alertDetailsOverride: 
id: 9c5dcd76-9f6d-42a3-b984-314b52678f20
displayName: Mimecast Audit - Logon Authentication Failed
version: 1.0.0
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: src_s
    identifier: Address
- entityType: Mailbox
  fieldMappings:
  - columnName: user_s
    identifier: MailboxPrimaryAddress
- entityType: CloudApplication
  fieldMappings:
  - columnName: app_s
    identifier: AppId
enabled: true
requiredDataConnectors:
- connectorId: MimecastAuditAPI
  dataTypes:
  - MimecastAudit_CL
apiVersion: 2021-09-01-preview
name: Mimecast Audit - Logon Authentication Failed
suppressionDuration: 5h
customDetails: 
triggerOperator: gt
eventGroupingSettings:
  aggregationKind: SingleAlert
relevantTechniques:
- T1110
suppressionEnabled: false
queryFrequency: 5m
alertRuleTemplateName: 
severity: High
incidentConfiguration:
  groupingConfiguration:
    reopenClosedIncident: false
    enabled: true
    lookbackDuration: 1d
    matchingMethod: AllEntities
  createIncident: true
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastAudit/Analytic%20Rules/MimecastAudit.yaml
description: Detects threat when logon authentication failure found in audit

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/9c5dcd76-9f6d-42a3-b984-314b52678f20')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9c5dcd76-9f6d-42a3-b984-314b52678f20')]",
      "properties": {
        "alertDetailsOverride": null,
        "alertRuleTemplateName": "9c5dcd76-9f6d-42a3-b984-314b52678f20",
        "apiVersion": "2021-09-01-preview",
        "customDetails": null,
        "description": "Detects threat when logon authentication failure found in audit",
        "displayName": "Mimecast Audit - Logon Authentication Failed",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "src_s",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "Mailbox",
            "fieldMappings": [
              {
                "columnName": "user_s",
                "identifier": "MailboxPrimaryAddress"
              }
            ]
          },
          {
            "entityType": "CloudApplication",
            "fieldMappings": [
              {
                "columnName": "app_s",
                "identifier": "AppId"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "P1D",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastAudit/Analytic%20Rules/MimecastAudit.yaml",
        "query": "MimecastAudit_CL | where src_s !=\"\" and auditType_s == \"Logon Authentication Failed\"",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "subTechniques": [],
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess",
          "Discovery",
          "InitialAccess"
        ],
        "techniques": [
          "T1110"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 3
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}