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

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

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 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"
    }
  ]
}