Microsoft Sentinel Analytic Rules
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ProofpointPOD - Multiple archived attachments to the same recipient

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Idbda5a2bd-979b-4828-a91f-27c2a5048f7f
RulenameProofpointPOD - Multiple archived attachments to the same recipient
DescriptionDetects when multiple emails where sent to the same recipient with large archived attachments.
SeverityMedium
TacticsExfiltration
TechniquesT1567
Required data connectorsProofpointPOD
KindScheduled
Query frequency30m
Query period30m
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODMultipleArchivedAttachmentsToSameRecipient.yaml
Version1.0.2
Arm templatebda5a2bd-979b-4828-a91f-27c2a5048f7f.json
Deploy To Azure
let lbtime = 30m;
let msgthreshold = 3;
let compressedTypes = dynamic(['zip', 'rar', 'tar', 'x-7z-compressed']);
ProofpointPOD
| where TimeGenerated > ago(lbtime)
| where EventType == 'message'
| where NetworkDirection == 'outbound'
| extend attachedMimeType = todynamic(MsgParts)[0]['detectedMime']
| where attachedMimeType has_any (compressedTypes)
| summarize count(), make_set(attachedMimeType) by SrcUserUpn, DstUserUpn
| where count_ > msgthreshold
| extend AccountCustomEntity = SrcUserUpn
queryPeriod: 30m
version: 1.0.2
relevantTechniques:
- T1567
queryFrequency: 30m
kind: Scheduled
name: ProofpointPOD - Multiple archived attachments to the same recipient
id: bda5a2bd-979b-4828-a91f-27c2a5048f7f
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
  entityType: Account
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODMultipleArchivedAttachmentsToSameRecipient.yaml
severity: Medium
query: |
  let lbtime = 30m;
  let msgthreshold = 3;
  let compressedTypes = dynamic(['zip', 'rar', 'tar', 'x-7z-compressed']);
  ProofpointPOD
  | where TimeGenerated > ago(lbtime)
  | where EventType == 'message'
  | where NetworkDirection == 'outbound'
  | extend attachedMimeType = todynamic(MsgParts)[0]['detectedMime']
  | where attachedMimeType has_any (compressedTypes)
  | summarize count(), make_set(attachedMimeType) by SrcUserUpn, DstUserUpn
  | where count_ > msgthreshold
  | extend AccountCustomEntity = SrcUserUpn  
tactics:
- Exfiltration
description: |
    'Detects when multiple emails where sent to the same recipient with large archived attachments.'
requiredDataConnectors:
- connectorId: ProofpointPOD
  dataTypes:
  - ProofpointPOD_message_CL
status: Available
triggerThreshold: 0
triggerOperator: gt
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/bda5a2bd-979b-4828-a91f-27c2a5048f7f')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/bda5a2bd-979b-4828-a91f-27c2a5048f7f')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "ProofpointPOD - Multiple archived attachments to the same recipient",
        "description": "'Detects when multiple emails where sent to the same recipient with large archived attachments.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let lbtime = 30m;\nlet msgthreshold = 3;\nlet compressedTypes = dynamic(['zip', 'rar', 'tar', 'x-7z-compressed']);\nProofpointPOD\n| where TimeGenerated > ago(lbtime)\n| where EventType == 'message'\n| where NetworkDirection == 'outbound'\n| extend attachedMimeType = todynamic(MsgParts)[0]['detectedMime']\n| where attachedMimeType has_any (compressedTypes)\n| summarize count(), make_set(attachedMimeType) by SrcUserUpn, DstUserUpn\n| where count_ > msgthreshold\n| extend AccountCustomEntity = SrcUserUpn\n",
        "queryFrequency": "PT30M",
        "queryPeriod": "PT30M",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Exfiltration"
        ],
        "techniques": [
          "T1567"
        ],
        "alertRuleTemplateName": "bda5a2bd-979b-4828-a91f-27c2a5048f7f",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ],
            "entityType": "Account"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODMultipleArchivedAttachmentsToSameRecipient.yaml",
        "status": "Available",
        "templateVersion": "1.0.2"
      }
    }
  ]
}