Network endpoint to host executable correlation

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Id	01f64465-b1ef-41ea-a7f5-31553a11ad43
Rulename	Network endpoint to host executable correlation
Description	Correlates blocked URLs hosting [malicious] executables with host endpoint data to identify potential instances of executables of the same name having been recently run.
Severity	Medium
Tactics	Execution
Techniques	T1204
Required data connectors	SecurityEvents TrendMicro WindowsForwardedEvents WindowsSecurityEvents
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/Network Threat Protection Essentials/Analytic Rules/NetworkEndpointCorrelation.yaml
Version	1.1.5
Arm template	01f64465-b1ef-41ea-a7f5-31553a11ad43.json

KQL

let endpointData = 
(union isfuzzy=true
(SecurityEvent
  | where EventID == 4688
  | extend shortFileName = tolower(tostring(split(NewProcessName, '\\')[-1]))
  ),
  (WindowsEvent
  | where EventID == 4688
  | extend  NewProcessName = tostring(EventData.NewProcessName)
  | extend shortFileName = tolower(tostring(split(NewProcessName, '\\')[-1]))
  | extend TargetUserName = tostring(EventData.TargetUserName)
  ));
// Correlate suspect executables seen in TrendMicro rule updates with similar activity on endpoints
CommonSecurityLog
| where DeviceVendor =~ "Trend Micro"
| where Activity =~ "Deny List updated" 
| where RequestURL endswith ".exe"
| project TimeGenerated, Activity , RequestURL , SourceIP, DestinationIP
| extend suspectExeName = tolower(tostring(split(RequestURL, '/')[-1]))
| join kind=innerunique (endpointData) on $left.suspectExeName == $right.shortFileName 
| extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))

YAML

severity: Medium
queryFrequency: 1d
relevantTechniques:
- T1204
tactics:
- Execution
kind: Scheduled
query: |
  let endpointData = 
  (union isfuzzy=true
  (SecurityEvent
    | where EventID == 4688
    | extend shortFileName = tolower(tostring(split(NewProcessName, '\\')[-1]))
    ),
    (WindowsEvent
    | where EventID == 4688
    | extend  NewProcessName = tostring(EventData.NewProcessName)
    | extend shortFileName = tolower(tostring(split(NewProcessName, '\\')[-1]))
    | extend TargetUserName = tostring(EventData.TargetUserName)
    ));
  // Correlate suspect executables seen in TrendMicro rule updates with similar activity on endpoints
  CommonSecurityLog
  | where DeviceVendor =~ "Trend Micro"
  | where Activity =~ "Deny List updated" 
  | where RequestURL endswith ".exe"
  | project TimeGenerated, Activity , RequestURL , SourceIP, DestinationIP
  | extend suspectExeName = tolower(tostring(split(RequestURL, '/')[-1]))
  | join kind=innerunique (endpointData) on $left.suspectExeName == $right.shortFileName 
  | extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Threat Protection Essentials/Analytic Rules/NetworkEndpointCorrelation.yaml
queryPeriod: 1d
status: Available
version: 1.1.5
name: Network endpoint to host executable correlation
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog
  connectorId: TrendMicro
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
- dataTypes:
  - SecurityEvents
  connectorId: WindowsSecurityEvents
- dataTypes:
  - WindowsEvent
  connectorId: WindowsForwardedEvents
triggerOperator: gt
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: TargetUserName
- entityType: Host
  fieldMappings:
  - identifier: HostName
    columnName: HostName
  - identifier: DnsDomain
    columnName: DnsDomain
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: DestinationIP
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: RequestURL
id: 01f64465-b1ef-41ea-a7f5-31553a11ad43
description: |
  'Correlates blocked URLs hosting [malicious] executables with host endpoint data
  to identify potential instances of executables of the same name having been recently run.'  
triggerThreshold: 0

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/01f64465-b1ef-41ea-a7f5-31553a11ad43')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/01f64465-b1ef-41ea-a7f5-31553a11ad43')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Network endpoint to host executable correlation",
        "description": "'Correlates blocked URLs hosting [malicious] executables with host endpoint data\nto identify potential instances of executables of the same name having been recently run.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "let endpointData = \n(union isfuzzy=true\n(SecurityEvent\n  | where EventID == 4688\n  | extend shortFileName = tolower(tostring(split(NewProcessName, '\\\\')[-1]))\n  ),\n  (WindowsEvent\n  | where EventID == 4688\n  | extend  NewProcessName = tostring(EventData.NewProcessName)\n  | extend shortFileName = tolower(tostring(split(NewProcessName, '\\\\')[-1]))\n  | extend TargetUserName = tostring(EventData.TargetUserName)\n  ));\n// Correlate suspect executables seen in TrendMicro rule updates with similar activity on endpoints\nCommonSecurityLog\n| where DeviceVendor =~ \"Trend Micro\"\n| where Activity =~ \"Deny List updated\" \n| where RequestURL endswith \".exe\"\n| project TimeGenerated, Activity , RequestURL , SourceIP, DestinationIP\n| extend suspectExeName = tolower(tostring(split(RequestURL, '/')[-1]))\n| join kind=innerunique (endpointData) on $left.suspectExeName == $right.shortFileName \n| extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Execution"
        ],
        "techniques": [
          "T1204"
        ],
        "alertRuleTemplateName": "01f64465-b1ef-41ea-a7f5-31553a11ad43",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "TargetUserName",
                "identifier": "Name"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "columnName": "HostName",
                "identifier": "HostName"
              },
              {
                "columnName": "DnsDomain",
                "identifier": "DnsDomain"
              }
            ],
            "entityType": "Host"
          },
          {
            "fieldMappings": [
              {
                "columnName": "DestinationIP",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          },
          {
            "fieldMappings": [
              {
                "columnName": "RequestURL",
                "identifier": "Url"
              }
            ],
            "entityType": "URL"
          }
        ],
        "templateVersion": "1.1.5",
        "status": "Available",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Threat Protection Essentials/Analytic Rules/NetworkEndpointCorrelation.yaml"
      }
    }
  ]
}