Cisco SE - Multiple malware on host | Microsoft Sentinel Analytic Rules

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Id	b13489d7-feb1-4ad3-9a4c-09f6d64448fd
Rulename	Cisco SE - Multiple malware on host
Description	This rule triggers when multiple malware where detected on host.
Severity	High
Tactics	InitialAccess
Techniques	T1190 T1133
Required data connectors	CiscoSecureEndpoint
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/Cisco%20Secure%20Endpoint/Analytic%20Rules/CiscoSEMultipleMalwareOnHost.yaml
Version	1.0.0
Arm template	b13489d7-feb1-4ad3-9a4c-09f6d64448fd.json

KQL

let threshold = 2;
CiscoSecureEndpoint
| where isnotempty(ThreatName)
| summarize infected = makeset(ThreatName) by DstHostname, bin(TimeGenerated, 10m)
| where array_length(infected) >= threshold
| extend HostCustomEntity = DstHostname

YAML

relevantTechniques:
- T1190
- T1133
kind: Scheduled
id: b13489d7-feb1-4ad3-9a4c-09f6d64448fd
queryFrequency: 1h
tactics:
- InitialAccess
version: 1.0.0
queryPeriod: 1h
description: |
  'This rule triggers when multiple malware where detected on host.'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cisco%20Secure%20Endpoint/Analytic%20Rules/CiscoSEMultipleMalwareOnHost.yaml
name: Cisco SE - Multiple malware on host
triggerThreshold: 0
query: |
  let threshold = 2;
  CiscoSecureEndpoint
  | where isnotempty(ThreatName)
  | summarize infected = makeset(ThreatName) by DstHostname, bin(TimeGenerated, 10m)
  | where array_length(infected) >= threshold
  | extend HostCustomEntity = DstHostname
entityMappings:
- fieldMappings:
  - columnName: HostCustomEntity
    identifier: HostName
  entityType: Host
triggerOperator: gt
status: Available
severity: High
requiredDataConnectors:
- dataTypes:
  - CiscoSecureEndpoint
  connectorId: CiscoSecureEndpoint

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/b13489d7-feb1-4ad3-9a4c-09f6d64448fd')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b13489d7-feb1-4ad3-9a4c-09f6d64448fd')]",
      "properties": {
        "alertRuleTemplateName": "b13489d7-feb1-4ad3-9a4c-09f6d64448fd",
        "customDetails": null,
        "description": "'This rule triggers when multiple malware where detected on host.'\n",
        "displayName": "Cisco SE - Multiple malware on host",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "HostCustomEntity",
                "identifier": "HostName"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cisco%20Secure%20Endpoint/Analytic%20Rules/CiscoSEMultipleMalwareOnHost.yaml",
        "query": "let threshold = 2;\nCiscoSecureEndpoint\n| where isnotempty(ThreatName)\n| summarize infected = makeset(ThreatName) by DstHostname, bin(TimeGenerated, 10m)\n| where array_length(infected) >= threshold\n| extend HostCustomEntity = DstHostname\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}