Mimecast Audit - Logon Authentication Failed | Microsoft Sentinel Analytic Rules

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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%20Rules/MimecastAudit/Mimecast_Audit.yaml
Version	1.0.1
Arm template	f00197ab-491f-41e7-9e22-a7003a4c1e54.json

KQL

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

YAML

triggerThreshold: 3
eventGroupingSettings:
  aggregationKind: SingleAlert
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    reopenClosedIncident: false
    matchingMethod: AllEntities
    enabled: true
    lookbackDuration: P7D
kind: Scheduled
description: Detects threat when logon authentication failure found in audit
alertRuleTemplateName: 
queryFrequency: 30m
triggerOperator: gt
relevantTechniques:
- T1110
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: SourceIp
  entityType: IP
- fieldMappings:
  - identifier: MailboxPrimaryAddress
    columnName: User
  entityType: Mailbox
- fieldMappings:
  - identifier: AppId
    columnName: Application
  entityType: CloudApplication
id: f00197ab-491f-41e7-9e22-a7003a4c1e54
enabled: true
displayName: Mimecast Audit - Logon Authentication Failed
query: |
  MimecastAudit 
  | where ['Source IP'] !="" and ['Audit Type'] == "Logon Authentication Failed"
  | extend   SourceIp = ['Source IP'] 
suppressionDuration: 5h
alertDetailsOverride: 
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic%20Rules/MimecastAudit/Mimecast_Audit.yaml
version: 1.0.1
customDetails: 
requiredDataConnectors:
- dataTypes:
  - MimecastAudit
  connectorId: MimecastAuditAPI
suppressionEnabled: false
tactics:
- Discovery
- InitialAccess
- CredentialAccess
queryPeriod: 30m
severity: High
name: Mimecast Audit - Logon Authentication Failed

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": null,
        "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%20Rules/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": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 3
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}