Process-Level Anomaly

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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 Rules/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

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

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 Rules/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"
    }
  ]
}