Microsoft Sentinel Analytic Rules
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Mimecast Audit - Logon Authentication Failed

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Id9c5dcd76-9f6d-42a3-b984-314b52678f20
RulenameMimecast Audit - Logon Authentication Failed
DescriptionDetects threat when logon authentication failure found in audit
SeverityHigh
TacticsDiscovery
InitialAccess
CredentialAccess
TechniquesT1110
Required data connectorsMimecastAuditAPI
KindScheduled
Query frequency5m
Query period15m
Trigger threshold3
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastAudit/Analytic Rules/MimecastAudit.yaml
Version1.0.0
Arm template9c5dcd76-9f6d-42a3-b984-314b52678f20.json
Deploy To Azure
MimecastAudit_CL | where src_s !="" and auditType_s == "Logon Authentication Failed"
triggerOperator: gt
kind: Scheduled
query: MimecastAudit_CL | where src_s !="" and auditType_s == "Logon Authentication Failed"
tactics:
- Discovery
- InitialAccess
- CredentialAccess
description: Detects threat when logon authentication failure found in audit
apiVersion: 2021-09-01-preview
triggerThreshold: 3
requiredDataConnectors:
- dataTypes:
  - MimecastAudit_CL
  connectorId: MimecastAuditAPI
relevantTechniques:
- T1110
name: Mimecast Audit - Logon Authentication Failed
version: 1.0.0
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
displayName: Mimecast Audit - Logon Authentication Failed
queryPeriod: 15m
customDetails: 
enabled: true
suppressionDuration: 5h
id: 9c5dcd76-9f6d-42a3-b984-314b52678f20
queryFrequency: 5m
alertRuleTemplateName: 
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastAudit/Analytic Rules/MimecastAudit.yaml
eventGroupingSettings:
  aggregationKind: SingleAlert
suppressionEnabled: false
incidentConfiguration:
  groupingConfiguration:
    matchingMethod: AllEntities
    reopenClosedIncident: false
    lookbackDuration: 1d
    enabled: true
  createIncident: true
alertDetailsOverride: 
severity: High
{
  "$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"
    }
  ]
}