Malware attachment delivered

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Id	0558155e-4556-447e-9a22-828f2a7de06b
Rulename	Malware attachment delivered
Description	This query identifies a message containing a malware attachment that was delivered.
Severity	Medium
Tactics	InitialAccess
Techniques	T1566.001
Required data connectors	ProofpointTAP
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ProofPointTap/Analytic Rules/MalwareAttachmentDelivered.yaml
Version	1.0.4
Arm template	0558155e-4556-447e-9a22-828f2a7de06b.json

KQL

ProofPointTAPMessagesDelivered_CL
| mv-expand todynamic(threatsInfoMap_s)
| mv-expand todynamic(messageParts_s)
| extend threatType = tostring(threatsInfoMap_s.threatType), classification = tostring(threatsInfoMap_s.classification)
| extend filename = tostring(messageParts_s.filename)
| where threatType =~ "attachment" and classification =~ "malware"
| summarize filenames = make_set(filename), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by TimeGenerated, Sender = sender_s, SenderIPAddress = senderIP_s, Recipient = recipient_s, threatType, classification,  Subject = subject_s
| mv-expand todynamic(Recipient)
| extend RecipientName = tostring(split(Recipient, "@")[0]), RecipientUPNSuffix = tostring(split(Recipient, "@")[1])
| extend SenderName = tostring(split(Sender, "@")[0]), SenderUPNSuffix = tostring(split(Sender, "@")[1])

YAML

relevantTechniques:
- T1566.001
name: Malware attachment delivered
requiredDataConnectors:
- dataTypes:
  - ProofPointTAPMessagesDelivered_CL
  connectorId: ProofpointTAP
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: Recipient
  - identifier: Name
    columnName: RecipientName
  - identifier: UPNSuffix
    columnName: RecipientUPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: FullName
    columnName: Sender
  - identifier: Name
    columnName: SenderName
  - identifier: UPNSuffix
    columnName: SenderUPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: SenderIPAddress
  entityType: IP
triggerThreshold: 0
id: 0558155e-4556-447e-9a22-828f2a7de06b
tactics:
- InitialAccess
version: 1.0.4
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ProofPointTap/Analytic Rules/MalwareAttachmentDelivered.yaml
queryPeriod: 1h
kind: Scheduled
queryFrequency: 1h
severity: Medium
status: Available
description: |
    'This query identifies a message containing a malware attachment that was delivered.'
query: |
  ProofPointTAPMessagesDelivered_CL
  | mv-expand todynamic(threatsInfoMap_s)
  | mv-expand todynamic(messageParts_s)
  | extend threatType = tostring(threatsInfoMap_s.threatType), classification = tostring(threatsInfoMap_s.classification)
  | extend filename = tostring(messageParts_s.filename)
  | where threatType =~ "attachment" and classification =~ "malware"
  | summarize filenames = make_set(filename), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by TimeGenerated, Sender = sender_s, SenderIPAddress = senderIP_s, Recipient = recipient_s, threatType, classification,  Subject = subject_s
  | mv-expand todynamic(Recipient)
  | extend RecipientName = tostring(split(Recipient, "@")[0]), RecipientUPNSuffix = tostring(split(Recipient, "@")[1])
  | extend SenderName = tostring(split(Sender, "@")[0]), SenderUPNSuffix = tostring(split(Sender, "@")[1])  
triggerOperator: gt

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/0558155e-4556-447e-9a22-828f2a7de06b')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/0558155e-4556-447e-9a22-828f2a7de06b')]",
      "properties": {
        "alertRuleTemplateName": "0558155e-4556-447e-9a22-828f2a7de06b",
        "customDetails": null,
        "description": "'This query identifies a message containing a malware attachment that was delivered.'\n",
        "displayName": "Malware attachment delivered",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Recipient",
                "identifier": "FullName"
              },
              {
                "columnName": "RecipientName",
                "identifier": "Name"
              },
              {
                "columnName": "RecipientUPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Sender",
                "identifier": "FullName"
              },
              {
                "columnName": "SenderName",
                "identifier": "Name"
              },
              {
                "columnName": "SenderUPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SenderIPAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ProofPointTap/Analytic Rules/MalwareAttachmentDelivered.yaml",
        "query": "ProofPointTAPMessagesDelivered_CL\n| mv-expand todynamic(threatsInfoMap_s)\n| mv-expand todynamic(messageParts_s)\n| extend threatType = tostring(threatsInfoMap_s.threatType), classification = tostring(threatsInfoMap_s.classification)\n| extend filename = tostring(messageParts_s.filename)\n| where threatType =~ \"attachment\" and classification =~ \"malware\"\n| summarize filenames = make_set(filename), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), count() by TimeGenerated, Sender = sender_s, SenderIPAddress = senderIP_s, Recipient = recipient_s, threatType, classification,  Subject = subject_s\n| mv-expand todynamic(Recipient)\n| extend RecipientName = tostring(split(Recipient, \"@\")[0]), RecipientUPNSuffix = tostring(split(Recipient, \"@\")[1])\n| extend SenderName = tostring(split(Sender, \"@\")[0]), SenderUPNSuffix = tostring(split(Sender, \"@\")[1])\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [
          "T1566.001"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1566"
        ],
        "templateVersion": "1.0.4",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}