CyberArkEPM - Unexpected executable extension

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Id	911d5b75-a1ce-4f13-a839-9c2474768696
Rulename	CyberArkEPM - Unexpected executable extension
Description	Detects Windows executable with unexpected extension.
Severity	Medium
Tactics	Execution DefenseEvasion
Techniques	T1204 T1036
Required data connectors	CyberArkEPM
Kind	Scheduled
Query frequency	30m
Query period	30m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CyberArkEPM/Analytic Rules/CyberArkEPMUnexpectedExecutableExtension.yaml
Version	1.0.0
Arm template	911d5b75-a1ce-4f13-a839-9c2474768696.json

KQL

CyberArkEPM
| where EventSubType != 'AttackAttempt'
| where ActingProcessName has @'\'
| where ActingProcessName !endswith '.exe'
| project EventEndTime, EventMessage, ActorUsername, ActingProcessFileInternalName
| extend AccountCustomEntity = ActorUsername

YAML

queryPeriod: 30m
version: 1.0.0
triggerThreshold: 0
relevantTechniques:
- T1204
- T1036
triggerOperator: gt
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountCustomEntity
  entityType: Account
query: |
  CyberArkEPM
  | where EventSubType != 'AttackAttempt'
  | where ActingProcessName has @'\'
  | where ActingProcessName !endswith '.exe'
  | project EventEndTime, EventMessage, ActorUsername, ActingProcessFileInternalName
  | extend AccountCustomEntity = ActorUsername  
name: CyberArkEPM - Unexpected executable extension
queryFrequency: 30m
requiredDataConnectors:
- connectorId: CyberArkEPM
  dataTypes:
  - CyberArkEPM
description: |
    'Detects Windows executable with unexpected extension.'
kind: Scheduled
id: 911d5b75-a1ce-4f13-a839-9c2474768696
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CyberArkEPM/Analytic Rules/CyberArkEPMUnexpectedExecutableExtension.yaml
tactics:
- Execution
- DefenseEvasion
severity: Medium

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/911d5b75-a1ce-4f13-a839-9c2474768696')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/911d5b75-a1ce-4f13-a839-9c2474768696')]",
      "properties": {
        "alertRuleTemplateName": "911d5b75-a1ce-4f13-a839-9c2474768696",
        "customDetails": null,
        "description": "'Detects Windows executable with unexpected extension.'\n",
        "displayName": "CyberArkEPM - Unexpected executable extension",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "Name"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CyberArkEPM/Analytic Rules/CyberArkEPMUnexpectedExecutableExtension.yaml",
        "query": "CyberArkEPM\n| where EventSubType != 'AttackAttempt'\n| where ActingProcessName has @'\\'\n| where ActingProcessName !endswith '.exe'\n| project EventEndTime, EventMessage, ActorUsername, ActingProcessFileInternalName\n| extend AccountCustomEntity = ActorUsername\n",
        "queryFrequency": "PT30M",
        "queryPeriod": "PT30M",
        "severity": "Medium",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "Execution"
        ],
        "techniques": [
          "T1036",
          "T1204"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}