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