Process-Level Anomaly | Microsoft Sentinel Analytic Rules

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Id	3fa85f64-5717-4562-b3fc-2c963f66afa6
Rulename	Process-Level Anomaly
Description	Triggers an incident when the same process name appears in 50 or more alerts across multiple devices, suggesting widespread activity.
Severity	Medium
Tactics	Execution DefenseEvasion
Techniques	T1059 T1204
Required data connectors	MorphisecCCF
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Morphisec/Analytic%20Rules/MorphisecProcessLevelAnomaly.yaml
Version	1.0.0
Arm template	3fa85f64-5717-4562-b3fc-2c963f66afa6.json

KQL

MorphisecAlerts_CL
| where threatMessageArrivalTime >= ago(24h)
| summarize 
    AlertCount = dcount(id),
    DeviceCount = dcount(hostname)
    by application
| where AlertCount >= 50 and DeviceCount > 1

YAML

suppressionEnabled: false
id: 3fa85f64-5717-4562-b3fc-2c963f66afa6
suppressionDuration: 5h
triggerOperator: gt
tactics:
- Execution
- DefenseEvasion
kind: Scheduled
requiredDataConnectors:
- dataTypes:
  - Morphisec
  connectorId: MorphisecCCF
queryPeriod: 1d
eventGroupingSettings:
  aggregationKind: SingleAlert
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Morphisec/Analytic%20Rules/MorphisecProcessLevelAnomaly.yaml
severity: Medium
relevantTechniques:
- T1059
- T1204
triggerThreshold: 0
version: 1.0.0
customDetails:
  ProcessName: application
name: Process-Level Anomaly
status: Available
query: |
  MorphisecAlerts_CL
  | where threatMessageArrivalTime >= ago(24h)
  | summarize 
      AlertCount = dcount(id),
      DeviceCount = dcount(hostname)
      by application
  | where AlertCount >= 50 and DeviceCount > 1
description: |
  'Triggers an incident when the same process name appears in 50 or more alerts across multiple devices, suggesting widespread activity.'
queryFrequency: 1d
incidentConfiguration:
  groupingConfiguration:
    enabled: false
    lookbackDuration: 5h
    reopenClosedIncident: false
    matchingMethod: AllEntities
  createIncident: true

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/3fa85f64-5717-4562-b3fc-2c963f66afa6')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/3fa85f64-5717-4562-b3fc-2c963f66afa6')]",
      "properties": {
        "alertRuleTemplateName": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
        "customDetails": {
          "ProcessName": "application"
        },
        "description": "'Triggers an incident when the same process name appears in 50 or more alerts across multiple devices, suggesting widespread activity.'\n",
        "displayName": "Process-Level Anomaly",
        "enabled": true,
        "entityMappings": null,
        "eventGroupingSettings": {
          "aggregationKind": "SingleAlert"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": false,
            "lookbackDuration": "PT5H",
            "matchingMethod": "AllEntities",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Morphisec/Analytic%20Rules/MorphisecProcessLevelAnomaly.yaml",
        "query": "MorphisecAlerts_CL\n| where threatMessageArrivalTime >= ago(24h)\n| summarize \n    AlertCount = dcount(id),\n    DeviceCount = dcount(hostname)\n    by application\n| where AlertCount >= 50 and DeviceCount > 1\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT5H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "Execution"
        ],
        "techniques": [
          "T1059",
          "T1204"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}