ProofpointPOD - Weak ciphers | Microsoft Sentinel Analytic Rules

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Id	56b0a0cd-894e-4b38-a0a1-c41d9f96649a
Rulename	ProofpointPOD - Weak ciphers
Description	Detects when weak TLS ciphers are used.
Severity	Low
Tactics	CommandAndControl
Techniques	T1573
Required data connectors	ProofpointPOD
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/Proofpoint%20On%20demand%28POD%29%20Email%20Security/Analytic%20Rules/ProofpointPODWeakCiphers.yaml
Version	1.0.3
Arm template	56b0a0cd-894e-4b38-a0a1-c41d9f96649a.json

KQL

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

YAML

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
requiredDataConnectors:
- dataTypes:
  - ProofpointPOD_message_CL
  connectorId: ProofpointPOD
name: ProofpointPOD - Weak ciphers
tactics:
- CommandAndControl
id: 56b0a0cd-894e-4b38-a0a1-c41d9f96649a
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Proofpoint%20On%20demand%28POD%29%20Email%20Security/Analytic%20Rules/ProofpointPODWeakCiphers.yaml
severity: Low
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
queryFrequency: 1h
version: 1.0.3
relevantTechniques:
- T1573
status: Available
queryPeriod: 1h
triggerThreshold: 0
description: |
  'Detects when weak TLS ciphers are used.'
kind: Scheduled

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/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%20On%20demand%28POD%29%20Email%20Security/Analytic%20Rules/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": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}