Maine Data Breach Portal Disruption: Defending Public Forms Against Automated Abuse

---
title: Potential Automated Abuse - High Volume Post Requests
id: 8a4b3c1d-2e5f-4a6b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects potential automated form submission abuse by identifying a high volume of POST requests from a single source IP to reporting endpoints within a short timeframe.
references:
  - https://attack.mitre.org/techniques/T1204/
author: Security Arsenal
date: 2026/04/02
tags:
  - attack.initial_access
  - attack.t1190
  - attack.impact
  - attack.t1565
logsource:
  category: web
  product: [any]
detection:
  selection:\    cs-method: POST
    cs-uri-path|contains:
      - 'report'
      - 'submit'
      - 'breach'
      - 'upload'
  condition: selection | count(cs-ip) by cs-uri-path > 50
  timeframe: 1m
falsepositives:
  - Legitimate bulk data migration (rare for public forms)
  - High-volume legitimate business reporting (should be whitelisted)
level: high
---
title: Fake Submission Indicators - Discord/VRChat Keywords
id: 9b5c4d2e-3f6a-5b7c-9d0e-1f2a3b4c5d6e
status: experimental
description: Detects submissions containing specific keywords associated with the recent Maine AG portal abuse (Discord, VRChat) in URI parameters or User-Agent strings.
references:
  - https://www.securityweek.com/maine-disables-data-breach-portal-due-to-fake-submissions/
author: Security Arsenal
date: 2026/04/02
tags:
  - attack.impact
  - attack.t1565.001
logsource:
  category: web
  product: [any]
detection:
  selection:
    cs-method|contains: POST
    cs-uri-query|contains:
      - 'Discord'
      - 'VRChat'
  condition: selection
falsepositives:
  - Legitimate breach reports actually involving Discord or VRChat
level: medium

let lookback = 1h;
let SubmissionPaths = dynamic([\"/report\", \"/submit\", \"/breach\", \"/upload\"]);
let IOCKeywords = dynamic([\"Discord\", \"VRChat\"]);
// Hunt 1: High volume POSTs from single IP
CommonSecurityLog
| where TimeGenerated > ago(lookback)
| where RequestMethod in (\"POST\")
| where RequestURL has_any (SubmissionPaths)
| summarize Count = count() by SourceIP, RequestURL
| where Count > 100
| project suspiciousIP=SourceIP, TargetURL=RequestURL, RequestCount=Count;
// Hunt 2: Specific keywords in payload (requires advanced logging or WAF inspection fields)
CommonSecurityLog
| where TimeGenerated > ago(lookback)
| where RequestMethod == \"POST\"
| where RequestURL has_any (SubmissionPaths)
| where RequestURL has_any (IOCKeywords) or AdditionalExtensions has_any (IOCKeywords)
| project TimeGenerated, SourceIP, RequestURL, Message

-- Hunt for automation tools potentially used to abuse web forms
SELECT Pid, Name, CommandLine, Exe, Username, CreateTime
FROM pslist()
WHERE Name IN ('curl.exe', 'wget.exe', 'python.exe', 'python3.exe', 'powershell.exe')
   AND (CommandLine =~ 'http' AND CommandLine =~ 'post')
   OR (CommandLine =~ 'submit' OR CommandLine =~ 'report')

# IIS Hardening Script to mitigate Automated Form Abuse
# Requires Web-Server and Web-IP-Security features installed
Import-Module WebAdministration

Write-Host \"Applying IIS Hardening Controls for Public Portals...\"

# 1. Enable Dynamic IP Restrictions (DIPR) to block high-frequency requests
$siteName = \"Default Web Site\" # Adjust to your specific site name
$configPath = \"IIS:\\Sites\\$siteName\"

if (Test-Path $configPath) {
    # Set DIPR settings globally for the server
    Set-WebConfigurationProperty -Filter '/system.webServer/security/dynamicIpSecurity' -PSPath 'MACHINE/WEBROOT/APPHOST' -Name 'denyAction' -Value 'Forbidden'
    Set-WebConfigurationProperty -Filter '/system.webServer/security/dynamicIpSecurity' -PSPath 'MACHINE/WEBROOT/APPHOST' -Name 'enableConcurrentConnections' -Value 'true'
    Set-WebConfigurationProperty -Filter '/system.webServer/security/dynamicIpSecurity' -PSPath 'MACHINE/WEBROOT/APPHOST' -Name 'maxConcurrentRequests' -Value '20'
    
    # 2. Add Request Filtering to limit URL length and query string (prevents buffer overflows and long injection strings)
    Set-WebConfigurationProperty -Filter '/system.webServer/security/requestFiltering' -PSPath 'MACHINE/WEBROOT/APPHOST' -Name 'maxUrl' -Value '4096'
    Set-WebConfigurationProperty -Filter '/system.webServer/security/requestFiltering' -PSPath 'MACHINE/WEBROOT/APPHOST' -Name 'maxQueryString' -Value '2048'

    Write-Host \"Hardening applied to $siteName. Ensure WAF rules are updated for keyword filtering.\" -ForegroundColor Green
} else {
    Write-Host \"Site $siteName not found.\" -ForegroundColor Yellow
}

# 3. Enable Verbose Logging for Forensics (if not already enabled)
Set-WebConfigurationProperty -Filter '/system.applicationHost/sites/site[@name=\"$siteName\"]/logFile' -PSPath 'MACHINE/WEBROOT/APPHOST' -Name 'logExtFileFlags' -Value 'Date,Time,ClientIP,UserName,Method,UriQuery,HttpStatus,Win32Status,TimeTaken,ServerPort,UserAgent,Referer'