Mimecast Audit - Logon Authentication Failed

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Id	f00197ab-491f-41e7-9e22-a7003a4c1e54
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	30m
Query period	30m
Trigger threshold	3
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastAudit/Mimecast_Audit.yaml
Version	1.0.0
Arm template	f00197ab-491f-41e7-9e22-a7003a4c1e54.json

KQL

MimecastAudit 
| where ['Source IP'] !="" and ['Audit Type'] == "Logon Authentication Failed"
| extend   SourceIp = ['Source IP']

YAML

incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: P7D
    reopenClosedIncident: false
    enabled: true
    matchingMethod: AllEntities
id: f00197ab-491f-41e7-9e22-a7003a4c1e54
enabled: true
queryPeriod: 30m
eventGroupingSettings:
  aggregationKind: SingleAlert
triggerThreshold: 3
queryFrequency: 30m
query: |
  MimecastAudit 
  | where ['Source IP'] !="" and ['Audit Type'] == "Logon Authentication Failed"
  | extend   SourceIp = ['Source IP']   
name: Mimecast Audit - Logon Authentication Failed
severity: High
relevantTechniques:
- T1110
triggerOperator: gt
alertRuleTemplateName: 
kind: Scheduled
suppressionDuration: 5h
tactics:
- Discovery
- InitialAccess
- CredentialAccess
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastAudit/Mimecast_Audit.yaml
customDetails: 
displayName: Mimecast Audit - Logon Authentication Failed
requiredDataConnectors:
- connectorId: MimecastAuditAPI
  dataTypes:
  - MimecastAudit_CL
version: 1.0.0
description: Detects threat when logon authentication failure found in audit
suppressionEnabled: false
alertDetailsOverride: 
entityMappings:
- fieldMappings:
  - columnName: SourceIp
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: User
    identifier: MailboxPrimaryAddress
  entityType: Mailbox
- fieldMappings:
  - columnName: Application
    identifier: AppId
  entityType: CloudApplication

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/f00197ab-491f-41e7-9e22-a7003a4c1e54')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/f00197ab-491f-41e7-9e22-a7003a4c1e54')]",
      "properties": {
        "alertDetailsOverride": null,
        "alertRuleTemplateName": "f00197ab-491f-41e7-9e22-a7003a4c1e54",
        "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": "SourceIp",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "Mailbox",
            "fieldMappings": [
              {
                "columnName": "User",
                "identifier": "MailboxPrimaryAddress"
              }
            ]
          },
          {
            "entityType": "CloudApplication",
            "fieldMappings": [
              {
                "columnName": "Application",
                "identifier": "AppId"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "P7D",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastAudit/Mimecast_Audit.yaml",
        "query": "MimecastAudit \n| where ['Source IP'] !=\"\" and ['Audit Type'] == \"Logon Authentication Failed\"\n| extend   SourceIp = ['Source IP'] \n",
        "queryFrequency": "PT30M",
        "queryPeriod": "PT30M",
        "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"
    }
  ]
}