ProofpointPOD - Weak ciphers

let lbtime = 1h;
let tls_ciphers = dynamic(['RC4-SHA', 'DES-CBC3-SHA']);
ProofpointPOD
| where EventType == 'message'
| where TlsCipher in (tls_ciphers)
| extend IPCustomEntity = SrcIpAddr

relevantTechniques:
- T1573
name: ProofpointPOD - Weak ciphers
requiredDataConnectors:
- dataTypes:
  - ProofpointPOD_message_CL
  connectorId: ProofpointPOD
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
  entityType: IP
triggerThreshold: 0
id: 56b0a0cd-894e-4b38-a0a1-c41d9f96649a
tactics:
- CommandandControl
version: 1.0.2
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODWeakCiphers.yaml
queryPeriod: 1h
kind: Scheduled
queryFrequency: 1h
severity: Low
status: Available
description: |
    'Detects when weak TLS ciphers are used.'
query: |
  let lbtime = 1h;
  let tls_ciphers = dynamic(['RC4-SHA', 'DES-CBC3-SHA']);
  ProofpointPOD
  | where EventType == 'message'
  | where TlsCipher in (tls_ciphers)
  | extend IPCustomEntity = SrcIpAddr  
triggerOperator: gt

{
  "$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/56b0a0cd-894e-4b38-a0a1-c41d9f96649a')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/56b0a0cd-894e-4b38-a0a1-c41d9f96649a')]",
      "properties": {
        "alertRuleTemplateName": "56b0a0cd-894e-4b38-a0a1-c41d9f96649a",
        "customDetails": null,
        "description": "'Detects when weak TLS ciphers are used.'\n",
        "displayName": "ProofpointPOD - Weak ciphers",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint On demand(POD) Email Security/Analytic Rules/ProofpointPODWeakCiphers.yaml",
        "query": "let lbtime = 1h;\nlet tls_ciphers = dynamic(['RC4-SHA', 'DES-CBC3-SHA']);\nProofpointPOD\n| where EventType == 'message'\n| where TlsCipher in (tls_ciphers)\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CommandandControl"
        ],
        "techniques": [
          "T1573"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}