Mimecast Audit - Logon Authentication Failed

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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 Rules/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

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

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": null,
        "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 Rules/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"
    }
  ]
}