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"
requiredDataConnectors:
- dataTypes:
  - MimecastAudit_CL
  connectorId: MimecastAuditAPI
tactics:
- Discovery
- InitialAccess
- CredentialAccess
query: MimecastAudit_CL | where src_s !="" and auditType_s == "Logon Authentication Failed"
apiVersion: 2021-09-01-preview
id: 9c5dcd76-9f6d-42a3-b984-314b52678f20
name: Mimecast Audit - Logon Authentication Failed
description: Detects threat when logon authentication failure found in audit
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MimecastAudit/Analytic Rules/MimecastAudit.yaml
triggerThreshold: 3
severity: High
alertRuleTemplateName: 
relevantTechniques:
- T1110
suppressionDuration: 5h
triggerOperator: gt
kind: Scheduled
alertDetailsOverride: 
customDetails: 
queryPeriod: 15m
enabled: true
displayName: Mimecast Audit - Logon Authentication Failed
eventGroupingSettings:
  aggregationKind: SingleAlert
version: 1.0.0
queryFrequency: 5m
suppressionEnabled: false
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    lookbackDuration: 1d
    matchingMethod: AllEntities
    reopenClosedIncident: false
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
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-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",
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess",
          "Discovery",
          "InitialAccess"
        ],
        "techniques": [
          "T1110"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 3
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}