Acronis - Multiple Inboxes with Malicious Content Detected

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Id	5090ad7b-4b47-4cab-9015-bffb43aecde8
Rulename	Acronis - Multiple Inboxes with Malicious Content Detected
Description	Many inboxes containing malicious content could indicate a potential ongoing phishing attack.
Severity	Medium
Tactics	InitialAccess
Techniques	T1566.002 T1566.001
Kind	Scheduled
Query frequency	1h
Query period	1d
Trigger threshold	2
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Acronis%20Cyber%20Protect%20Cloud/Analytic%20Rules/AcronisMultipleInboxesWithMaliciousContentDetected.yaml
Version	1.0.0
Arm template	5090ad7b-4b47-4cab-9015-bffb43aecde8.json

KQL

CommonSecurityLog
| where DeviceVendor == "Acronis"
| where DeviceEventClassID in
("MaliciousURLDetectedInM365MailboxBackup",
"MalwareDetectedInM365MailboxBackup",
"MaliciousEmailDetectedPerceptionPointWarning")
| summarize MaliciousContent = count() by DeviceName

YAML

entityMappings:
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: DeviceName
name: Acronis - Multiple Inboxes with Malicious Content Detected
kind: Scheduled
queryFrequency: 1h
triggerOperator: gt
customDetails:
  DeviceName: DeviceName
queryPeriod: 1d
requiredDataConnectors: []
tactics:
- InitialAccess
description: Many inboxes containing malicious content could indicate a potential ongoing phishing attack.
severity: Medium
incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: P1D
    enabled: true
    reopenClosedIncident: true
    matchingMethod: AnyAlert
  createIncident: true
id: 5090ad7b-4b47-4cab-9015-bffb43aecde8
eventGroupingSettings:
  aggregationKind: SingleAlert
triggerThreshold: 2
query: |
  CommonSecurityLog
  | where DeviceVendor == "Acronis"
  | where DeviceEventClassID in
  ("MaliciousURLDetectedInM365MailboxBackup",
  "MalwareDetectedInM365MailboxBackup",
  "MaliciousEmailDetectedPerceptionPointWarning")
  | summarize MaliciousContent = count() by DeviceName
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Acronis%20Cyber%20Protect%20Cloud/Analytic%20Rules/AcronisMultipleInboxesWithMaliciousContentDetected.yaml
version: 1.0.0
relevantTechniques:
- T1566.002
- T1566.001

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/5090ad7b-4b47-4cab-9015-bffb43aecde8')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/5090ad7b-4b47-4cab-9015-bffb43aecde8')]",
      "properties": {
        "alertRuleTemplateName": "5090ad7b-4b47-4cab-9015-bffb43aecde8",
        "customDetails": {
          "DeviceName": "DeviceName"
        },
        "description": "Many inboxes containing malicious content could indicate a potential ongoing phishing attack.",
        "displayName": "Acronis - Multiple Inboxes with Malicious Content Detected",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "HostName"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "lookbackDuration": "P1D",
            "matchingMethod": "AnyAlert",
            "reopenClosedIncident": true
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Acronis%20Cyber%20Protect%20Cloud/Analytic%20Rules/AcronisMultipleInboxesWithMaliciousContentDetected.yaml",
        "query": "CommonSecurityLog\n| where DeviceVendor == \"Acronis\"\n| where DeviceEventClassID in\n(\"MaliciousURLDetectedInM365MailboxBackup\",\n\"MalwareDetectedInM365MailboxBackup\",\n\"MaliciousEmailDetectedPerceptionPointWarning\")\n| summarize MaliciousContent = count() by DeviceName\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "subTechniques": [
          "T1566.002",
          "T1566.001"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1566"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 2
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}