General

This is where you control the main features of Check.

Extension Settings

Enable Page Blocking

This is Check's main job - blocking dangerous websites. When this is turned on (which we recommend), Check will stop you from visiting fake Microsoft login pages and show you a warning instead. There are times you need to disable the checkbox for testing purposes. Removing this checkbox removes most of your protection so it's recommended to leave this setting enabled.

Enable CIPP Reporting

CIPP is a system that IT professionals use to monitor security across multiple organizations. Enabling CIPP monitoring allows you to send detection information from Check directly to CIPP, thus allowing you to alert and report on what's happening with your endpoints. When enabled, you would configure the CIPP Server URL and Tenant ID/Domain below.

View CIPP reporting activity in the Activity Logs section.

CIPP Server URL

Enter the base URL of your CIPP server for reporting Microsoft 365 logon detections. This should be the full URL to your CIPP instance (e.g., https://your-cipp-server.com). This field is only active when CIPP Reporting is enabled.

Tenant ID/Domain

Enter your tenant identifier to include with CIPP alerts for multi-tenant environments. You can use either your tenant GUID or your primary domain (e.g., contoso.onmicrosoft.com or the tenant GUID). This helps CIPP identify which tenant the alert belongs to when managing multiple clients.

Currently, CIPP displays these alerts in the logbook. Future updates to CIPP are planned to provide additional functionality. Keep an eye on the CIPP release notes for more updates!

You can monitor CIPP reporting status and activity in Activity Logs.

False Positive Webhook URL

This setting allows you to configure a webhook endpoint that receives false positive reports from users. When configured, a "Report False Positive" button will appear on blocked pages, allowing users to report when Check has incorrectly blocked a legitimate website.

Enter the full URL to your webhook endpoint (e.g., https://your-server.com/api/false-positive). When a user clicks the "Report False Positive" button, Check will send a POST request with comprehensive detection data to help you review and improve your detection rules.

Webhook Payload Structure

Your webhook endpoint will receive a POST request with Content-Type: application/json containing the following fields:

Field	Type	Description
timestamp	string	ISO 8601 timestamp when the report was submitted
reportType	string	Always "false_positive"
blockedUrl	string	The defanged URL that was blocked (colons replaced with [:])
blockReason	string	User-facing explanation for why the page was blocked
userAgent	string	Complete browser user agent string
browserInfo	object	Browser environment details (see below)
screenResolution	object	Display information (see below)
detectionDetails	object	Complete detection data (see below)
extensionVersion	string	Version of Check that generated the report

browserInfo object:

• platform - Operating system (e.g., "Linux x86_64", "Win32", "MacIntel")

• language - Browser language setting (e.g., "en-US")

• vendor - Browser vendor (e.g., "Google Inc.")

• cookiesEnabled - Boolean indicating if cookies are enabled

• onLine - Boolean indicating network connectivity status

screenResolution object:

• width - Screen width in pixels

• height - Screen height in pixels

• availWidth - Available screen width (excluding taskbars)

• availHeight - Available screen height (excluding taskbars)

• colorDepth - Color depth in bits (e.g., 24)

detectionDetails object:

• url - Original URL (non-defanged)

• score - Legitimacy score assigned by detection engine

• threshold - Threshold value that triggered the block

• reason - Detailed technical reason for blocking

• pageTitle - Title of the blocked page

• timestamp - When the page was blocked

• threats - Array of threat objects with id, type, description, and severity

• phishingIndicators - Array of specific indicators that triggered detection

• Additional fields depending on detection method used

Complete Payload Example

{
  "timestamp": "2025-11-05T21:30:00.000Z",
  "reportType": "false_positive",
  "blockedUrl": "https[:]//example[.]com/login",
  "blockReason": "This website looks like it has tried to steal your login credentials, to prevent you from logging in we've blocked access.",
  "userAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
  "browserInfo": {
    "platform": "Linux x86_64",
    "language": "en-US",
    "vendor": "Google Inc.",
    "cookiesEnabled": true,
    "onLine": true
  },
  "screenResolution": {
    "width": 1920,
    "height": 1080,
    "availWidth": 1920,
    "availHeight": 1040,
    "colorDepth": 24
  },
  "detectionDetails": {
    "url": "https://example.com/login",
    "score": 42,
    "threshold": 50,
    "reason": "Multiple phishing indicators detected: score 42/50 (3 phishing indicators)",
    "pageTitle": "Sign In - Example Services",
    "timestamp": "2025-11-05T21:29:45.000Z",
    "userAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36",
    "threats": [
      {
        "id": "phi_suspicious_domain",
        "type": "domain_analysis",
        "description": "Domain closely resembles microsoft.com",
        "severity": "high"
      },
      {
        "id": "phi_fake_login_form",
        "type": "form_analysis",
        "description": "Login form mimics Microsoft 365 sign-in",
        "severity": "medium"
      }
    ],
    "phishingIndicators": [
      {
        "id": "phi_suspicious_domain",
        "description": "Domain closely resembles microsoft.com",
        "severity": "high"
      },
      {
        "id": "phi_fake_login_form",
        "description": "Login form mimics Microsoft 365 sign-in",
        "severity": "medium"
      },
      {
        "id": "phi_suspicious_title",
        "description": "Page title suggests Microsoft login",
        "severity": "low"
      }
    ]
  },
  "extensionVersion": "1.0.0"
}

Webhook Requirements

Your webhook endpoint should:

1. Accept POST requests with Content-Type: application/json

2. Respond with HTTP status codes:

   • 200 OK - Report successfully received

   • 4xx - Client error (user will see error message)

   • 5xx - Server error (user will see error message)

3. Respond within 30 seconds to avoid timeout

4. Use HTTPS to protect sensitive detection data in transit

Usage Notes:

• Leave this field empty if you don't want to enable false positive reporting

• The "Report False Positive" button only appears when this webhook URL is configured

User Interface

Show Notifications

When Check blocks a dangerous website or finds something suspicious, it can show you a small popup message to let you know what's going on. We recommend leaving this setting enabled

Show Valid Page Badge

This adds a small green checkmark to real Microsoft login pages. This feature is optional.

What if Settings Are Not Visible?

If some settings do not appear on my version, it means your organization's IT department has set these for you. This is normal in business environments - your IT team wants to make sure everyone has the same security settings. You will also see text indicating that the extension is being managed by policy.