Imperva - Malicious user agent

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Id	905794a9-bc46-42b9-974d-5a2dd58110c5
Rulename	Imperva - Malicious user agent
Description	Detects requests containing known malicious user agent strings.
Severity	High
Tactics	InitialAccess
Techniques	T1190 T1133
Required data connectors	ImpervaWAFCloudAPI
Kind	Scheduled
Query frequency	10m
Query period	10m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ImpervaCloudWAF/Analytic Rules/ImpervaMaliciousUA.yaml
Version	1.0.1
Arm template	905794a9-bc46-42b9-974d-5a2dd58110c5.json

KQL

ImpervaWAFCloud
| where HttpUserAgentOriginal has_any ('Nikto', 'hydra', 'advanced email extractor', 'BFAC', 'brutus', 'cgichk', 'cisco-torch', 'scanner', 'datacha0s', 'dirbuster', 'grabber', 'havij', 'internet ninja', 'masscan', 'morfeus', 'mysqloit', 'n-stealth', 'nessus', 'netsparker', 'nmap nse', 'nmap scripting engine', 'nmap-nse', 'nsauditor', 'openvas', 'pangolin', 'qualys was', 'security scan', 'springenwerk', 'sql power injector', 'sqlmap', 'sqlninja', 'w3af.sf.net', 'w3af.sourceforge.net', 'w3af.org', 'webbandit', 'webinspect', 'webvulnscan', 'xmlrpc exploit', 'WPScan', 'XSpider', 'Webster', 'fantomCrew', 'fantomBrowser')
| summarize count() by SrcIpAddr, bin(TimeGenerated, 5m)
| extend IPCustomEntity = SrcIpAddr

YAML

severity: High
queryPeriod: 10m
name: Imperva - Malicious user agent
relevantTechniques:
- T1190
- T1133
id: 905794a9-bc46-42b9-974d-5a2dd58110c5
requiredDataConnectors:
- connectorId: ImpervaWAFCloudAPI
  dataTypes:
  - ImpervaWAFCloud
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ImpervaCloudWAF/Analytic Rules/ImpervaMaliciousUA.yaml
version: 1.0.1
tactics:
- InitialAccess
kind: Scheduled
query: |
  ImpervaWAFCloud
  | where HttpUserAgentOriginal has_any ('Nikto', 'hydra', 'advanced email extractor', 'BFAC', 'brutus', 'cgichk', 'cisco-torch', 'scanner', 'datacha0s', 'dirbuster', 'grabber', 'havij', 'internet ninja', 'masscan', 'morfeus', 'mysqloit', 'n-stealth', 'nessus', 'netsparker', 'nmap nse', 'nmap scripting engine', 'nmap-nse', 'nsauditor', 'openvas', 'pangolin', 'qualys was', 'security scan', 'springenwerk', 'sql power injector', 'sqlmap', 'sqlninja', 'w3af.sf.net', 'w3af.sourceforge.net', 'w3af.org', 'webbandit', 'webinspect', 'webvulnscan', 'xmlrpc exploit', 'WPScan', 'XSpider', 'Webster', 'fantomCrew', 'fantomBrowser')
  | summarize count() by SrcIpAddr, bin(TimeGenerated, 5m)
  | extend IPCustomEntity = SrcIpAddr  
status: Available
triggerThreshold: 0
description: |
    'Detects requests containing known malicious user agent strings.'
queryFrequency: 10m

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/905794a9-bc46-42b9-974d-5a2dd58110c5')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/905794a9-bc46-42b9-974d-5a2dd58110c5')]",
      "properties": {
        "alertRuleTemplateName": "905794a9-bc46-42b9-974d-5a2dd58110c5",
        "customDetails": null,
        "description": "'Detects requests containing known malicious user agent strings.'\n",
        "displayName": "Imperva - Malicious user agent",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ImpervaCloudWAF/Analytic Rules/ImpervaMaliciousUA.yaml",
        "query": "ImpervaWAFCloud\n| where HttpUserAgentOriginal has_any ('Nikto', 'hydra', 'advanced email extractor', 'BFAC', 'brutus', 'cgichk', 'cisco-torch', 'scanner', 'datacha0s', 'dirbuster', 'grabber', 'havij', 'internet ninja', 'masscan', 'morfeus', 'mysqloit', 'n-stealth', 'nessus', 'netsparker', 'nmap nse', 'nmap scripting engine', 'nmap-nse', 'nsauditor', 'openvas', 'pangolin', 'qualys was', 'security scan', 'springenwerk', 'sql power injector', 'sqlmap', 'sqlninja', 'w3af.sf.net', 'w3af.sourceforge.net', 'w3af.org', 'webbandit', 'webinspect', 'webvulnscan', 'xmlrpc exploit', 'WPScan', 'XSpider', 'Webster', 'fantomCrew', 'fantomBrowser')\n| summarize count() by SrcIpAddr, bin(TimeGenerated, 5m)\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT10M",
        "queryPeriod": "PT10M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1133",
          "T1190"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}