App GW WAF - Code Injection

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Id	912a18fc-6165-446b-8740-81ae6c3f75ee
Rulename	App GW WAF - Code Injection
Description	Identifies a match for a Code Injection based attack in the App Gateway WAF logs. The threshold value in the query can be changed as per your infrastructure’s requirements. References: https://owasp.org/www-community/attacks/Code_Injection
Severity	High
Tactics	DefenseEvasion Execution InitialAccess PrivilegeEscalation
Techniques	T1548 T1203 T1190 T1548
Required data connectors	WAF
Kind	Scheduled
Query frequency	6h
Query period	6h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Web Application Firewall (WAF)/Analytic Rules/App-GW-WAF-Code-Injection.yaml
Version	1.0.1
Arm template	912a18fc-6165-446b-8740-81ae6c3f75ee.json

KQL

let Threshold = 3;  
AzureDiagnostics
| where Category == "ApplicationGatewayFirewallLog"
| where action_s == "Matched"
| where Message has "Injection" or Message has "File Inclusion"
| where ruleGroup_s == "REQUEST-932-APPLICATION-ATTACK-RCE" or ruleGroup_s == "REQUEST-931-APPLICATION-ATTACK-RFI" or ruleGroup_s == "REQUEST-932-APPLICATION-ATTACK-RCE" or ruleGroup_s == "REQUEST-933-APPLICATION-ATTACK-PHP" or ruleGroup_s == "REQUEST-942-APPLICATION-ATTACK-SQLI" or ruleGroup_s == "REQUEST-921-PROTOCOL-ATTACK" or ruleGroup_s == "REQUEST-941-APPLICATION-ATTACK-XSS"
| project transactionId_g, hostname_s, requestUri_s, TimeGenerated, clientIp_s, Message, details_message_s, details_data_s
| join kind = inner(
AzureDiagnostics
| where Category == "ApplicationGatewayFirewallLog"
| where action_s == "Blocked") on transactionId_g
| extend Uri = strcat(hostname_s,requestUri_s)
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), TransactionID = make_set(transactionId_g,100), Message = make_set(Message,100), Detail_Message = make_set(details_message_s,100), Detail_Data = make_set(details_data_s,100), Total_TransactionId = dcount(transactionId_g) by clientIp_s, Uri, action_s
| where Total_TransactionId >= Threshold

YAML

severity: High
name: App GW WAF - Code Injection
requiredDataConnectors:
- dataTypes:
  - AzureDiagnostics
  connectorId: WAF
tags:
- Code Injection
id: 912a18fc-6165-446b-8740-81ae6c3f75ee
tactics:
- DefenseEvasion
- Execution
- InitialAccess
- PrivilegeEscalation
queryFrequency: 6h
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Web Application Firewall (WAF)/Analytic Rules/App-GW-WAF-Code-Injection.yaml
description: |
  'Identifies a match for a Code Injection based attack in the App Gateway WAF logs. The threshold value in the query can be changed as per your infrastructure's requirements.
  References: https://owasp.org/www-community/attacks/Code_Injection'  
triggerThreshold: 0
kind: Scheduled
relevantTechniques:
- T1548
- T1203
- T1190
- T1548
query: |
  let Threshold = 3;  
  AzureDiagnostics
  | where Category == "ApplicationGatewayFirewallLog"
  | where action_s == "Matched"
  | where Message has "Injection" or Message has "File Inclusion"
  | where ruleGroup_s == "REQUEST-932-APPLICATION-ATTACK-RCE" or ruleGroup_s == "REQUEST-931-APPLICATION-ATTACK-RFI" or ruleGroup_s == "REQUEST-932-APPLICATION-ATTACK-RCE" or ruleGroup_s == "REQUEST-933-APPLICATION-ATTACK-PHP" or ruleGroup_s == "REQUEST-942-APPLICATION-ATTACK-SQLI" or ruleGroup_s == "REQUEST-921-PROTOCOL-ATTACK" or ruleGroup_s == "REQUEST-941-APPLICATION-ATTACK-XSS"
  | project transactionId_g, hostname_s, requestUri_s, TimeGenerated, clientIp_s, Message, details_message_s, details_data_s
  | join kind = inner(
  AzureDiagnostics
  | where Category == "ApplicationGatewayFirewallLog"
  | where action_s == "Blocked") on transactionId_g
  | extend Uri = strcat(hostname_s,requestUri_s)
  | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), TransactionID = make_set(transactionId_g,100), Message = make_set(Message,100), Detail_Message = make_set(details_message_s,100), Detail_Data = make_set(details_data_s,100), Total_TransactionId = dcount(transactionId_g) by clientIp_s, Uri, action_s
  | where Total_TransactionId >= Threshold  
entityMappings:
- entityType: URL
  fieldMappings:
  - columnName: Uri
    identifier: Url
- entityType: IP
  fieldMappings:
  - columnName: clientIp_s
    identifier: Address
status: Available
version: 1.0.1
queryPeriod: 6h

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/912a18fc-6165-446b-8740-81ae6c3f75ee')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/912a18fc-6165-446b-8740-81ae6c3f75ee')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "App GW WAF - Code Injection",
        "description": "'Identifies a match for a Code Injection based attack in the App Gateway WAF logs. The threshold value in the query can be changed as per your infrastructure's requirements.\nReferences: https://owasp.org/www-community/attacks/Code_Injection'\n",
        "severity": "High",
        "enabled": true,
        "query": "let Threshold = 3;  \nAzureDiagnostics\n| where Category == \"ApplicationGatewayFirewallLog\"\n| where action_s == \"Matched\"\n| where Message has \"Injection\" or Message has \"File Inclusion\"\n| where ruleGroup_s == \"REQUEST-932-APPLICATION-ATTACK-RCE\" or ruleGroup_s == \"REQUEST-931-APPLICATION-ATTACK-RFI\" or ruleGroup_s == \"REQUEST-932-APPLICATION-ATTACK-RCE\" or ruleGroup_s == \"REQUEST-933-APPLICATION-ATTACK-PHP\" or ruleGroup_s == \"REQUEST-942-APPLICATION-ATTACK-SQLI\" or ruleGroup_s == \"REQUEST-921-PROTOCOL-ATTACK\" or ruleGroup_s == \"REQUEST-941-APPLICATION-ATTACK-XSS\"\n| project transactionId_g, hostname_s, requestUri_s, TimeGenerated, clientIp_s, Message, details_message_s, details_data_s\n| join kind = inner(\nAzureDiagnostics\n| where Category == \"ApplicationGatewayFirewallLog\"\n| where action_s == \"Blocked\") on transactionId_g\n| extend Uri = strcat(hostname_s,requestUri_s)\n| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated), TransactionID = make_set(transactionId_g,100), Message = make_set(Message,100), Detail_Message = make_set(details_message_s,100), Detail_Data = make_set(details_data_s,100), Total_TransactionId = dcount(transactionId_g) by clientIp_s, Uri, action_s\n| where Total_TransactionId >= Threshold\n",
        "queryFrequency": "PT6H",
        "queryPeriod": "PT6H",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "Execution",
          "InitialAccess",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1548",
          "T1203",
          "T1190",
          "T1548"
        ],
        "alertRuleTemplateName": "912a18fc-6165-446b-8740-81ae6c3f75ee",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "Url",
                "columnName": "Uri"
              }
            ],
            "entityType": "URL"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "clientIp_s"
              }
            ],
            "entityType": "IP"
          }
        ],
        "status": "Available",
        "templateVersion": "1.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Azure Web Application Firewall (WAF)/Analytic Rules/App-GW-WAF-Code-Injection.yaml",
        "tags": [
          "Code Injection"
        ]
      }
    }
  ]
}