Microsoft Sentinel Analytic Rules
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Mimecast Audit - Logon Authentication Failed

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Idf00197ab-491f-41e7-9e22-a7003a4c1e54
RulenameMimecast Audit - Logon Authentication Failed
DescriptionDetects threat when logon authentication failure found in audit
SeverityHigh
TacticsDiscovery
InitialAccess
CredentialAccess
TechniquesT1110
Required data connectorsMimecastAuditAPI
KindScheduled
Query frequency30m
Query period30m
Trigger threshold3
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastAudit/Mimecast_Audit.yaml
Version1.0.1
Arm templatef00197ab-491f-41e7-9e22-a7003a4c1e54.json
Deploy To Azure
MimecastAudit 
| where ['Source IP'] !="" and ['Audit Type'] == "Logon Authentication Failed"
| extend   SourceIp = ['Source IP'] 
suppressionEnabled: false
id: f00197ab-491f-41e7-9e22-a7003a4c1e54
alertDetailsOverride: 
query: |
  MimecastAudit 
  | where ['Source IP'] !="" and ['Audit Type'] == "Logon Authentication Failed"
  | extend   SourceIp = ['Source IP']   
suppressionDuration: 5h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Mimecast/Analytic Rules/MimecastAudit/Mimecast_Audit.yaml
version: 1.0.1
name: Mimecast Audit - Logon Authentication Failed
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SourceIp
- entityType: Mailbox
  fieldMappings:
  - identifier: MailboxPrimaryAddress
    columnName: User
- entityType: CloudApplication
  fieldMappings:
  - identifier: AppId
    columnName: Application
incidentConfiguration:
  groupingConfiguration:
    matchingMethod: AllEntities
    reopenClosedIncident: false
    lookbackDuration: P7D
    enabled: true
  createIncident: true
displayName: Mimecast Audit - Logon Authentication Failed
tactics:
- Discovery
- InitialAccess
- CredentialAccess
triggerThreshold: 3
alertRuleTemplateName: 
enabled: true
requiredDataConnectors:
- dataTypes:
  - MimecastAudit
  connectorId: MimecastAuditAPI
eventGroupingSettings:
  aggregationKind: SingleAlert
description: Detects threat when logon authentication failure found in audit
customDetails: 
queryPeriod: 30m
severity: High
relevantTechniques:
- T1110
kind: Scheduled
queryFrequency: 30m
triggerOperator: gt
{
  "$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": "f00197ab-491f-41e7-9e22-a7003a4c1e54",
        "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 Rules/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"
    }
  ]
}