Mimecast Audit - Logon Authentication Failed

Back


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

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

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": 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",
        "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"
    }
  ]
}