Microsoft Sentinel Analytic Rules
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Remote Desktop Network Brute force ASIM Network Session schema

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Idb7dc801e-1e79-48bb-91e8-2229a8e6d40b
RulenameRemote Desktop Network Brute force (ASIM Network Session schema)
DescriptionThis detection identifies RDP application network traffic and filters any source/destination pair generating more than 25 events hard threshold.
SeverityMedium
TacticsCredentialAccess
TechniquesT1110
KindScheduled
Query frequency1h
Query period1h
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Session Essentials/Analytic Rules/Remote Desktop Network Brute force (ASIM Network Session schema).yaml
Version1.0.0
Arm templateb7dc801e-1e79-48bb-91e8-2229a8e6d40b.json
Deploy To Azure
// Start of the query and  Filter events that resulted in failure
_Im_NetworkSession(eventresult="Failure")
// Filter out private source IP addresses and focus on specific destination port (3389)
// Also, ensure that the source and destination IP addresses are not the same
| where not(ipv4_is_private(SrcIpAddr)) and tostring(DstPortNumber) has_any ("3389") and SrcIpAddr != DstIpAddr
// Summarize the data by source and destination IP addresses, destination port number, network protocol, and event result
// Also, bin the time generated in 5-minute intervals
// Calculate the minimum and maximum time generated, the sum of event counts, and a set of up to 10 event vendors
| summarize Starttime= min(TimeGenerated),EndTime= max(TimeGenerated),TargettedIPs=dcount(DstIpAddr),Eventscount=sum(EventCount),EventVendors=make_set(EventVendor,10) by SrcIpAddr,DstPortNumber,EventResult, bin(TimeGenerated, 5m)
// Filter the summarized data to include only those with an event count of 25 or more
| where Eventscount >= 25
queryFrequency: 1h
severity: Medium
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Session Essentials/Analytic Rules/Remote Desktop Network Brute force (ASIM Network Session schema).yaml
entityMappings:
- fieldMappings:
  - columnName: SrcIpAddr
    identifier: Address
  entityType: IP
id: b7dc801e-1e79-48bb-91e8-2229a8e6d40b
name: Remote Desktop Network Brute force (ASIM Network Session schema)
query: |
  // Start of the query and  Filter events that resulted in failure
  _Im_NetworkSession(eventresult="Failure")
  // Filter out private source IP addresses and focus on specific destination port (3389)
  // Also, ensure that the source and destination IP addresses are not the same
  | where not(ipv4_is_private(SrcIpAddr)) and tostring(DstPortNumber) has_any ("3389") and SrcIpAddr != DstIpAddr
  // Summarize the data by source and destination IP addresses, destination port number, network protocol, and event result
  // Also, bin the time generated in 5-minute intervals
  // Calculate the minimum and maximum time generated, the sum of event counts, and a set of up to 10 event vendors
  | summarize Starttime= min(TimeGenerated),EndTime= max(TimeGenerated),TargettedIPs=dcount(DstIpAddr),Eventscount=sum(EventCount),EventVendors=make_set(EventVendor,10) by SrcIpAddr,DstPortNumber,EventResult, bin(TimeGenerated, 5m)
  // Filter the summarized data to include only those with an event count of 25 or more
  | where Eventscount >= 25  
tags:
- Schema: ASimNetworkSessions
  SchemaVersion: 0.2.4
queryPeriod: 1h
eventGroupingSettings:
  aggregationKind: AlertPerResult
tactics:
- CredentialAccess
version: 1.0.0
kind: Scheduled
relevantTechniques:
- T1110
triggerThreshold: 0
status: Available
requiredDataConnectors: []
description: |
    'This detection identifies RDP application network traffic and filters any source/destination pair generating more than 25 events hard threshold.'
triggerOperator: gt
{
  "$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/b7dc801e-1e79-48bb-91e8-2229a8e6d40b')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b7dc801e-1e79-48bb-91e8-2229a8e6d40b')]",
      "properties": {
        "alertRuleTemplateName": "b7dc801e-1e79-48bb-91e8-2229a8e6d40b",
        "customDetails": null,
        "description": "'This detection identifies RDP application network traffic and filters any source/destination pair generating more than 25 events hard threshold.'\n",
        "displayName": "Remote Desktop Network Brute force (ASIM Network Session schema)",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SrcIpAddr",
                "identifier": "Address"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Session Essentials/Analytic Rules/Remote Desktop Network Brute force (ASIM Network Session schema).yaml",
        "query": "// Start of the query and  Filter events that resulted in failure\n_Im_NetworkSession(eventresult=\"Failure\")\n// Filter out private source IP addresses and focus on specific destination port (3389)\n// Also, ensure that the source and destination IP addresses are not the same\n| where not(ipv4_is_private(SrcIpAddr)) and tostring(DstPortNumber) has_any (\"3389\") and SrcIpAddr != DstIpAddr\n// Summarize the data by source and destination IP addresses, destination port number, network protocol, and event result\n// Also, bin the time generated in 5-minute intervals\n// Calculate the minimum and maximum time generated, the sum of event counts, and a set of up to 10 event vendors\n| summarize Starttime= min(TimeGenerated),EndTime= max(TimeGenerated),TargettedIPs=dcount(DstIpAddr),Eventscount=sum(EventCount),EventVendors=make_set(EventVendor,10) by SrcIpAddr,DstPortNumber,EventResult, bin(TimeGenerated, 5m)\n// Filter the summarized data to include only those with an event count of 25 or more\n| where Eventscount >= 25\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "tags": [
          {
            "Schema": "ASimNetworkSessions",
            "SchemaVersion": "0.2.4"
          }
        ],
        "techniques": [
          "T1110"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}