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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
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<title>MAPS Protocol — Complete Technical Guide</title>
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<body>
<!-- Nav -->
<div class="nav">
<div style="display:flex;align-items:center;gap:12px;">
<button class="menu-btn" onclick="toggleSidebar()">☰</button>
<span class="nav-title">MAPS PROTOCOL GUIDE</span>
</div>
<div class="nav-controls">
<button class="nav-btn" id="prevBtn" onclick="prevSlide()">← Prev</button>
<span class="slide-counter" id="counter">1 / 16</span>
<button class="nav-btn" id="nextBtn" onclick="nextSlide()">Next →</button>
</div>
</div>
<div class="progress"><div class="progress-bar" id="progressBar"></div></div>
<!-- Sidebar TOC -->
<div class="sidebar" id="sidebar">
<div class="toc-section">Overview</div>
<div class="toc-item" data-slide="0">1. What is MAPS?</div>
<div class="toc-item" data-slide="1">2. MAPS in Windows Defender</div>
<div class="toc-item" data-slide="2">3. Architecture Overview</div>
<div class="toc-section">Protocol</div>
<div class="toc-item" data-slide="3">4. Bond Wire Format</div>
<div class="toc-item" data-slide="4">5. Bonded<T> Envelope</div>
<div class="toc-item" data-slide="5">6. HTTP Transport</div>
<div class="toc-section">Request Types</div>
<div class="toc-item" data-slide="6">7. File Scan Flow</div>
<div class="toc-item" data-slide="7">8. URL Reputation Flow</div>
<div class="toc-item" data-slide="8">9. Heartbeat System</div>
<div class="toc-item" data-slide="9">10. BAFS / Block at First Sight</div>
<div class="toc-item" data-slide="10">11. Sample Upload Flow</div>
<div class="toc-section">Responses</div>
<div class="toc-item" data-slide="11">12. Response Parsing</div>
<div class="toc-item" data-slide="12">13. FASTPATH Signatures</div>
<div class="toc-section">Advanced</div>
<div class="toc-item" data-slide="13">14. SpynetReport Schema (372 Fields)</div>
<div class="toc-item" data-slide="14">15. All Endpoints & Auth</div>
<div class="toc-item" data-slide="15">16. Attack Surface & Fuzzing</div>
</div>
<!-- Slides -->
<div class="slides-container">
<!-- SLIDE 0: What is MAPS? -->
<div class="slide active" id="slide-0">
<h1>What is MAPS?</h1>
<p class="subtitle">Microsoft Active Protection Service — Windows Defender's Cloud Brain</p>
<div class="grid-2">
<div class="card">
<div class="card-title">Purpose</div>
<div class="card-body">
MAPS is the cloud-based reputation and dynamic signature delivery system
behind Windows Defender. Every time Defender scans a file, it can query MAPS
to get a real-time verdict from Microsoft's cloud, including dynamic
"FASTPATH" signatures that bypass local signature updates.
</div>
</div>
<div class="card">
<div class="card-title">Key Capabilities</div>
<div class="card-body">
<ul style="margin-left:16px">
<li>File reputation (hash-based cloud lookup)</li>
<li>URL/domain reputation checking</li>
<li>Dynamic signature delivery (FASTPATH)</li>
<li>Block at First Sight (zero-day protection)</li>
<li>Sample upload for cloud detonation</li>
<li>Heartbeat/telemetry collection</li>
<li>AMSI script content analysis</li>
</ul>
</div>
</div>
</div>
<h2>How Defender Uses MAPS</h2>
<div class="flow">
<div class="flow-box highlight">
<div class="label">Local Scan</div>
<div class="value">Defender scans file locally</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box">
<div class="label">Low-Fi Detection</div>
<div class="value">Local heuristic trigger (suspicious but not confirmed)</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box highlight">
<div class="label">MAPS Query</div>
<div class="value">Send file hashes + metadata to cloud</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-row">
<div class="flow-box success">
<div class="label">Clean</div>
<div class="value">88 bytes response<br>No signatures</div>
</div>
<div class="flow-box danger">
<div class="label">Malicious</div>
<div class="value">~488 bytes response<br>FASTPATH + threat name</div>
</div>
<div class="flow-box warn">
<div class="label">Unknown</div>
<div class="value">SampleRequest<br>Upload file for detonation</div>
</div>
</div>
</div>
</div>
<!-- SLIDE 1: MAPS in Defender -->
<div class="slide" id="slide-1">
<h1>MAPS in Windows Defender</h1>
<p class="subtitle">How MAPS integrates with Microsoft Defender Antivirus — the cloud brain behind endpoint protection</p>
<h2>What is MAPS in the Defender Pipeline?</h2>
<p>MAPS (Microsoft Advanced Protection Service, formerly "SpyNet") is the cloud protection backend for Microsoft Defender Antivirus. It's not a separate product — it's the cloud component that every Defender installation communicates with to deliver real-time verdicts on suspicious files, URLs, and behaviors. When cloud protection is enabled (the default), Defender queries MAPS before allowing unknown executables to run.</p>
<div class="grid-2">
<div class="card">
<div class="card-title">Why MAPS Exists</div>
<div class="card-body">
Local signature databases can't keep up with the volume of new malware (400K+ new samples/day).
MAPS allows Microsoft to:<br>
• Deliver verdicts on <strong>never-before-seen files</strong> in seconds<br>
• Push <strong>dynamic FASTPATH signatures</strong> without waiting for definition updates<br>
• Aggregate telemetry from <strong>billions of endpoints</strong> for ML-based detection<br>
• Trigger <strong>cloud detonation</strong> (sandbox analysis) for suspicious unknowns
</div>
</div>
<div class="card">
<div class="card-title">Where MAPS Sits in the Stack</div>
<div class="card-body">
<strong>Layer 1:</strong> Local signatures (VDM database) — known threats<br>
<strong>Layer 2:</strong> Local heuristics/ML — suspicious behavior detection<br>
<strong>Layer 3:</strong> <span style="color:var(--accent)">MAPS cloud query</span> — real-time cloud verdict<br>
<strong>Layer 4:</strong> <span style="color:var(--accent)">FASTPATH delivery</span> — dynamic signature push<br>
<strong>Layer 5:</strong> <span style="color:var(--accent)">Cloud detonation</span> — sandbox analysis<br>
<strong>Layer 6:</strong> Behavior monitoring + AMSI — runtime protection
</div>
</div>
</div>
<h2>Defender Features Powered by MAPS</h2>
<table class="tbl">
<tr><th>Feature</th><th>MAPS Role</th><th>User Impact</th></tr>
<tr><td><strong>Cloud-Delivered Protection</strong></td><td>Real-time file reputation via hash lookup</td><td>Unknown files blocked/allowed in <1 second</td></tr>
<tr><td><strong>Block at First Sight (BAFS)</strong></td><td>Synchronous cloud query with execution hold</td><td>Zero-day files blocked before first execution</td></tr>
<tr><td><strong>Emergency Dynamic Intelligence</strong></td><td>FASTPATH signature blobs pushed per-client</td><td>New threat protection in minutes vs hours</td></tr>
<tr><td><strong>Automatic Sample Submission</strong></td><td>Cloud requests file upload via SAS URI</td><td>Unknown files sent to Azure sandbox for analysis</td></tr>
<tr><td><strong>SmartScreen URL Filtering</strong></td><td>URL reputation queries via MAPS protocol</td><td>Phishing/malware URLs blocked in browser</td></tr>
<tr><td><strong>Network Protection</strong></td><td>Network connection telemetry to MAPS</td><td>C2/malicious IP connections detected</td></tr>
<tr><td><strong>AMSI Cloud Analysis</strong></td><td>Script content submitted for cloud verdict</td><td>Obfuscated PowerShell/VBS malware caught</td></tr>
<tr><td><strong>Tamper Protection Telemetry</strong></td><td>Heartbeat type 10 reports tampering</td><td>Alerts on attempts to disable Defender</td></tr>
</table>
<h2>MAPS Data Flow in Real-Time Protection</h2>
<div class="flow">
<div class="flow-row">
<div class="flow-box" style="border-color:var(--accent2)">
<div class="label">User Action</div>
<div class="value">Opens file / visits URL / runs script</div>
</div>
<div class="flow-arrow-right">→</div>
<div class="flow-box">
<div class="label">Local Scan</div>
<div class="value">Signatures + heuristics + ML model</div>
</div>
<div class="flow-arrow-right">→</div>
<div class="flow-box" style="border-color:var(--warn)">
<div class="label">Low-Confidence?</div>
<div class="value">Suspicious but not confirmed</div>
</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box highlight" style="min-width:500px">
<div class="label">MAPS Cloud Query</div>
<div class="value">POST Bond payload to wdcp.microsoft.com — SHA256 + metadata + context</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-row">
<div class="flow-box success">
<div class="label">Clean (88B)</div>
<div class="value">Allow file to run</div>
</div>
<div class="flow-box danger">
<div class="label">Malicious (~488B)</div>
<div class="value">Block + FASTPATH sig<br>+ quarantine</div>
</div>
<div class="flow-box warn">
<div class="label">Need Sample</div>
<div class="value">Upload to Azure<br>sandbox for analysis</div>
</div>
</div>
</div>
<p style="margin-top:16px">
<strong>Key stat:</strong> With cloud protection enabled (Windows 10 E5), emergency dynamic intelligence updates can deliver
fixes for malware within <strong>minutes</strong> instead of waiting for the next scheduled definition update.
Microsoft recommends keeping cloud protection <strong>always on</strong>.
</p>
</div>
<!-- SLIDE 2: Architecture -->
<div class="slide" id="slide-2">
<h1>Architecture Overview</h1>
<p class="subtitle">End-to-end system architecture from client to cloud</p>
<div class="flow">
<div class="flow-row">
<div class="flow-box" style="border-color:var(--accent2)">
<div class="label">Windows Client</div>
<div class="value">MpSvc.dll / MpClient.dll</div>
</div>
<div class="flow-arrow-right">→</div>
<div class="flow-box" style="border-color:var(--accent2)">
<div class="label">Engine</div>
<div class="value">mpengine.dll<br><small style="color:var(--muted)">Bond serialization</small></div>
</div>
<div class="flow-arrow-right">→</div>
<div class="flow-box" style="border-color:var(--accent2)">
<div class="label">Communication</div>
<div class="value">MpCommu.dll<br><small style="color:var(--muted)">HTTPS transport</small></div>
</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box highlight" style="min-width:400px">
<div class="label">HTTPS POST</div>
<div class="value">wdcp.microsoft.com/wdcp.svc/bond/submitreport</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-row">
<div class="flow-box success">
<div class="label">MAPS Cloud</div>
<div class="value">Reputation DB</div>
</div>
<div class="flow-box success">
<div class="label">Detonation</div>
<div class="value">Azure Sandbox</div>
</div>
<div class="flow-box success">
<div class="label">FASTPATH</div>
<div class="value">Dynamic Signatures</div>
</div>
</div>
</div>
<h2>Key DLLs (Reverse-Engineered)</h2>
<table class="tbl">
<tr><th>Component</th><th>DLL</th><th>Role</th></tr>
<tr><td>Engine</td><td><code>mpengine.dll</code></td><td>Bond schema definitions (372 fields), payload construction, FASTPATH parsing</td></tr>
<tr><td>Communication</td><td><code>MpCommu.dll</code></td><td>HTTP transport, version header encoding, TLS, endpoint selection</td></tr>
<tr><td>Service</td><td><code>MpSvc.dll</code></td><td>Heartbeat manager (12 subtypes), scan orchestration, scheduling</td></tr>
<tr><td>Client</td><td><code>MpClient.dll</code></td><td>WMI/COM interface, configuration, trigger exports</td></tr>
</table>
</div>
<!-- SLIDE 3: Bond Wire Format -->
<div class="slide" id="slide-3">
<h1>Bond CompactBinaryV1 Wire Format</h1>
<p class="subtitle">Microsoft's binary serialization protocol — the wire format of all MAPS traffic</p>
<h2>Field Header Encoding</h2>
<pre>
┌─────────┬──────────┐
│ 7 6 5 │ 4 3 2 1 0│ 1 byte field header
├─────────┼──────────┤
│ delta │ bond_type│
└─────────┴──────────┘
delta 1-5: field_id = previous_id + delta (inline)
delta 6: field_id = next_byte (uint8 absolute)
delta 7: field_id = next_two_bytes (uint16 LE absolute)</pre>
<h2>19 Bond Data Types</h2>
<div class="grid-3">
<div class="card">
<div class="card-title">Primitives</div>
<div class="card-body">
<code>BT_BOOL=2</code> (1 byte)<br>
<code>BT_UINT8=3</code> (1 byte)<br>
<code>BT_UINT16=4</code> (varint)<br>
<code>BT_UINT32=5</code> (varint)<br>
<code>BT_UINT64=6</code> (varint)<br>
<code>BT_FLOAT=7</code> (4 bytes LE)<br>
<code>BT_DOUBLE=8</code> (8 bytes LE)
</div>
</div>
<div class="card">
<div class="card-title">Signed (ZigZag)</div>
<div class="card-body">
<code>BT_INT8=14</code> (zigzag byte)<br>
<code>BT_INT16=15</code> (zigzag varint)<br>
<code>BT_INT32=16</code> (zigzag varint)<br>
<code>BT_INT64=17</code> (zigzag varint)<br>
<br>
zigzag(n) = (n << 1) ^ (n >> 63)<br>
<small>Maps signed → unsigned</small>
</div>
</div>
<div class="card">
<div class="card-title">Complex</div>
<div class="card-body">
<code>BT_STRING=9</code> (varint len + UTF-8)<br>
<code>BT_WSTRING=18</code> (varint chars + UTF-16LE)<br>
<code>BT_STRUCT=10</code> (fields...BT_STOP)<br>
<code>BT_LIST=11</code> (type + count + values)<br>
<code>BT_SET=12</code> (same as list)<br>
<code>BT_MAP=13</code> (ktype+vtype+count)<br>
<code>BT_STOP=0</code> / <code>BT_STOP_BASE=1</code>
</div>
</div>
</div>
<h2>Varint Encoding</h2>
<pre>
Value 300 (0x12C):
Byte 1: 0xAC = 0b_1_0101100 (continuation + low 7 bits: 44)
Byte 2: 0x02 = 0b_0_0000010 (final + high bits: 2)
Result: (2 << 7) | 44 = 256 + 44 = 300 ✓</pre>
</div>
<!-- SLIDE 4: Bonded<T> Envelope -->
<div class="slide" id="slide-4">
<h1>Bonded<T> Envelope</h1>
<p class="subtitle">The outer wrapper that encapsulates all MAPS payloads</p>
<h2>Structure</h2>
<pre>
<span style="color:var(--accent)">43 42 01 00</span> ← CB marshal header ("CB" + version 1)
Outer Struct {
<span style="color:var(--accent3)">F5: STRING</span> = schema_name ← "Microsoft.ProtectionServices.Entities.Raw.SpynetReportEntity"
<span style="color:var(--warn)">BT_STOP_BASE</span> ← Base class terminator #1
<span style="color:var(--warn)">BT_STOP_BASE</span> ← Base class terminator #2 (resets field counter)
F10: LIST<LIST<INT8>> = [[]] ← Runtime type info (empty)
<span style="color:var(--accent)">F20: STRUCT</span> { ← Inner payload wrapper
<span style="color:var(--accent3)">F5: STRING</span> = schema_name ← Schema name repeated
<span style="color:var(--warn)">BT_STOP_BASE</span> ← Base class terminator #1
<span style="color:var(--warn)">BT_STOP_BASE</span> ← Base class terminator #2
<span style="color:#ff79c6">[SpynetReport fields...]</span> ← Actual payload data
BT_STOP ← End inner struct
}
BT_STOP ← End outer struct</pre>
<h2>Key Schema Name</h2>
<pre>Microsoft.ProtectionServices.Entities.Raw.SpynetReportEntity</pre>
<p>This schema name is mandatory. The server validates it and returns HTTP 500 for unrecognized schemas.</p>
<h2>Binary Example (Heartbeat)</h2>
<pre>
43 42 01 00 ← "CB\x01\x00" marshal header
A9 3D 4D 69 63 72 6F ... ← F5 STRING: schema name (61 bytes)
01 ← BT_STOP_BASE
01 ← BT_STOP_BASE
CB 0B 0E 01 00 ← F10: LIST<LIST<INT8>> = [[]]
EA 3D 4D 69 63 72 6F ... ← F20.F5 STRING: schema name again
01 01 ← Two more BT_STOP_BASE
[payload fields...] ← SpynetReport Bond fields
00 ← BT_STOP (inner)
00 ← BT_STOP (outer)</pre>
</div>
<!-- SLIDE 5: HTTP Transport -->
<div class="slide" id="slide-5">
<h1>HTTP Transport Layer</h1>
<p class="subtitle">HTTPS request/response format matching real Defender traffic</p>
<h2>Request Headers</h2>
<pre>
POST /wdcp.svc/bond/submitreport HTTP/1.1
Host: wdcp.microsoft.com
Content-Type: <span style="color:var(--accent3)">application/bond</span>
Accept: <span style="color:var(--accent3)">application/bond</span>
Accept-Charset: utf-8
User-Agent: <span style="color:var(--accent)">MpCommunication</span>
Connection: Keep-Alive
<span style="color:var(--warn)">X-MS-MAPS-CUSTOMERTYPE</span>: Consumer
<span style="color:var(--warn)">X-MS-MAPS-OSVERSION</span>: a0000000065f4
<span style="color:var(--warn)">X-MS-MAPS-PLATFORMVERSION</span>: 40012659a0005
<span style="color:var(--warn)">X-MS-MAPS-ENGINEVERSION</span>: 10001659a0001
Content-Length: <size></pre>
<h2>Version Header Encoding</h2>
<p>Versions are packed as 64-bit hex: <code>(major<<48) | (minor<<32) | (build<<16) | revision</code></p>
<table class="tbl">
<tr><th>Version String</th><th>Hex Encoding</th><th>Type</th></tr>
<tr><td><code>10.0.26100</code></td><td><code>a0000000065f4</code></td><td>OS Version (3-part)</td></tr>
<tr><td><code>4.18.26010.5</code></td><td><code>40012659a0005</code></td><td>Platform Version</td></tr>
<tr><td><code>1.1.26010.1</code></td><td><code>10001659a0001</code></td><td>Engine Version</td></tr>
</table>
<h2>Authentication Modes</h2>
<div class="grid-3">
<div class="card">
<div class="card-title"><span class="badge badge-green">Consumer</span></div>
<div class="card-body">No auth header needed.<br><code>X-MS-MAPS-CUSTOMERTYPE: Consumer</code></div>
</div>
<div class="card">
<div class="card-title"><span class="badge badge-purple">Enterprise</span></div>
<div class="card-body"><code>Authorization: Bearer <AAD_TOKEN></code><br>Client ID: <code>cab96880-db5b-...</code></div>
</div>
<div class="card">
<div class="card-title"><span class="badge badge-red">Legacy (Dead)</span></div>
<div class="card-body">WS-Security UsernameToken<br>Path: <code>/WdCpSrvc.asmx</code> → 404</div>
</div>
</div>
</div>
<!-- SLIDE 6: File Scan Flow -->
<div class="slide" id="slide-6">
<h1>File Scan Flow</h1>
<p class="subtitle">Complete request/response cycle for cloud file reputation</p>
<div class="flow">
<div class="flow-box highlight">
<div class="label">Step 1</div>
<div class="value">Compute file hashes<br><small>SHA256 + SHA1 + MD5 + CRC32</small></div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box highlight">
<div class="label">Step 2</div>
<div class="value">Build SpynetReport payload<br><small>Bond CB1 serialization</small></div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box" style="border-color:var(--accent2)">
<div class="label">Step 3</div>
<div class="value">Wrap in Bonded<T> envelope</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box highlight">
<div class="label">Step 4</div>
<div class="value">POST to /wdcp.svc/bond/submitreport</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box success">
<div class="label">Step 5</div>
<div class="value">Parse Bond response → MAPSVerdict</div>
</div>
</div>
<h2>SpynetReport Payload Structure</h2>
<pre>
SpynetReport {
F20: Revision = LIST<INT16>[3] ← Schema version
F30: MachineGuid = STRING ← Client identity (UUID4)
F40: AvSigVersion = STRING ← "1.445.126.0"
F60: EngineVersion = STRING ← "1.1.26010.1"
F150: OsVer = STRING ← "10.0.0.0"
F170: OsBuild = LIST<UINT32>[26100]
F200: GeoId = LIST<INT32>[244] ← US
F300: AppVersion = STRING ← "4.18.26010.5"
<span style="color:var(--accent)">F390: FileReportElements = LIST<LIST<STRUCT>></span> [
FileReport {
F10: Revision = LIST<INT16>[1]
F20: Index = LIST<INT16>[1]
<span style="color:var(--accent3)">F30: CoreReport = LIST<STRUCT></span> [{
F20: FileName = "malware.exe"
F30: FileSystem = "NTFS"
F40: Size = LIST<INT64>[file_size]
F80: MD5 = "44d88612fea..."
F90: SHA1 = "3395856ce81..."
F100: SHA256 = "275a021bbf..."
<span style="color:var(--danger)">F330: ReportType = "2"</span> ← SYNC_LOWFI
}]
}
]
F1050: EngineReportGuid = STRING (UUID)
}</pre>
</div>
<!-- SLIDE 7: URL Reputation -->
<div class="slide" id="slide-7">
<h1>URL Reputation Flow</h1>
<p class="subtitle">How Defender queries cloud for URL/domain safety ratings</p>
<div class="flow">
<div class="flow-box highlight">
<div class="label">Input</div>
<div class="value">URL string (e.g. https://example.com)</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box" style="border-color:var(--accent2)">
<div class="label">Report Type</div>
<div class="value">CoreReport.ReportType = 5 (URL_REPUTATION)</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box highlight" style="min-width:350px">
<div class="label">UrlReport (F1542)</div>
<div class="value">UrlReportGuid + UrlList + SigSeq + SigSha</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box success">
<div class="label">Response</div>
<div class="value">UrlResponse with Determination + Confidence + TTL</div>
</div>
</div>
<h2>UrlReport Structure (F1542)</h2>
<pre>
UrlReport = <span style="color:var(--danger)">LIST<STRUCT></span>[1] { ← Must be LIST, not STRUCT (HTTP 500 otherwise!)
F3: UrlReportGuid = STRING (UUID)
F6: UrlList = STRUCT {
F3: Urls = LIST<STRUCT> [
UrlElement {
F20: Url = "https://example.com" ← Only field set by engine
<span style="color:var(--muted)">// F10: Order — NOT set by engine</span>
<span style="color:var(--muted)">// F21: Url_Scrubbed — NOT set by engine</span>
}
]
}
F9: UrlContext = STRUCT { ... } ← Optional
F12: SigSeq = "0" ← Mandatory
F15: SigSha = "" ← Mandatory
<span style="color:var(--muted)">// F18: ReportOnly — omitted when querying</span>
}</pre>
<h2>URL Response Fields</h2>
<table class="tbl">
<tr><th>Field</th><th>Type</th><th>Description</th></tr>
<tr><td>Url</td><td>STRING</td><td>The queried URL</td></tr>
<tr><td>Determination</td><td>UINT8</td><td>0=Unknown, 1=Clean, 2=Malicious, 3=Phishing</td></tr>
<tr><td>Confidence</td><td>UINT8</td><td>0-100 confidence score</td></tr>
<tr><td>TTL</td><td>UINT8</td><td>Cache time-to-live (short)</td></tr>
<tr><td>TTLlong</td><td>UINT64</td><td>Extended TTL value</td></tr>
</table>
</div>
<!-- SLIDE 8: Heartbeat System -->
<div class="slide" id="slide-8">
<h1>Heartbeat System</h1>
<p class="subtitle">12 heartbeat subtypes for connectivity, telemetry, and lifecycle events</p>
<h2>Report Type = 4 (HEARTBEAT)</h2>
<p>Heartbeat is indicated by <code>F90: IsHeartBeat = 1</code> in SpynetReport, plus <code>F920</code>/<code>F930</code> subtype fields.</p>
<table class="tbl">
<tr><th>Value</th><th>Name</th><th>Trigger</th></tr>
<tr><td><span class="badge badge-blue">0</span></td><td>STILL_ALIVE</td><td>Periodic timer (default)</td></tr>
<tr><td><span class="badge badge-green">1</span></td><td>SETUP</td><td>First run / initial setup</td></tr>
<tr><td><span class="badge badge-red">2</span></td><td>UNINSTALL</td><td>MpTriggerHeartbeatOnUninstall</td></tr>
<tr><td><span class="badge badge-red">3</span></td><td>ERROR</td><td>MpTriggerErrorHeartbeatReport</td></tr>
<tr><td><span class="badge badge-yellow">4</span></td><td>POLICY_CHANGE</td><td>Configuration/Group Policy update</td></tr>
<tr><td><span class="badge badge-blue">5</span></td><td>BROWSER</td><td>MpSendBrowserHeartbeat</td></tr>
<tr><td><span class="badge badge-purple">6</span></td><td>EXCLUSION</td><td>Exclusion list change</td></tr>
<tr><td><span class="badge badge-green">7</span></td><td>CLEANUP</td><td>Post-remediation cleanup</td></tr>
<tr><td><span class="badge badge-blue">8</span></td><td>SIGNATURE_UPDATE</td><td>After signature update</td></tr>
<tr><td><span class="badge badge-blue">9</span></td><td>PLATFORM_UPDATE</td><td>After platform/engine update</td></tr>
<tr><td><span class="badge badge-red">10</span></td><td>TAMPER_PROTECT</td><td>Tamper protection event</td></tr>
<tr><td><span class="badge badge-yellow">11</span></td><td>REBOOT</td><td>Post-reboot heartbeat</td></tr>
</table>
<h2>Heartbeat Bond Fields</h2>
<pre>
F90: IsHeartBeat = UINT8(1) ← Flags this as heartbeat
F920: StillAliveHB = LIST<UINT8>[type] ← Heartbeat subtype (0-11)
F930: HBControlGroup = LIST<UINT8>[0] ← A/B test group
F940: HBSubtype = UINT8 ← Additional subtype info
F290: Membership = "2" ← Report type string</pre>
</div>
<!-- SLIDE 9: BAFS -->
<div class="slide" id="slide-9">
<h1>Block at First Sight (BAFS)</h1>
<p class="subtitle">Zero-tolerance cloud blocking for unknown files</p>
<div class="flow">
<div class="flow-box danger">
<div class="label">Trigger</div>
<div class="value">Unknown file + CloudBlockLevel = 6 (ZERO_TOLERANCE)</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box highlight">
<div class="label">Report Type</div>
<div class="value">SYNC_LOWFI (2) — synchronous blocking query</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box" style="border-color:var(--accent2)">
<div class="label">Cloud Verdict</div>
<div class="value">Server blocks file execution until verdict arrives</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-row">
<div class="flow-box success">
<div class="label">Allow</div>
<div class="value">No FASTPATH → file runs</div>
</div>
<div class="flow-box danger">
<div class="label">Block</div>
<div class="value">FASTPATH delivered → quarantine</div>
</div>
</div>
</div>
<h2>Cloud Block Levels</h2>
<table class="tbl">
<tr><th>Level</th><th>Value</th><th>Behavior</th></tr>
<tr><td><span class="badge badge-blue">OFF/DEFAULT</span></td><td>0</td><td>No cloud checking</td></tr>
<tr><td><span class="badge badge-green">MODERATE</span></td><td>1</td><td>Normal blocking threshold</td></tr>
<tr><td><span class="badge badge-yellow">HIGH</span></td><td>2</td><td>Aggressive blocking (default for MAPS)</td></tr>
<tr><td><span class="badge badge-red">HIGH_PLUS</span></td><td>4</td><td>Very aggressive blocking</td></tr>
<tr><td><span class="badge badge-red">ZERO_TOLERANCE</span></td><td>6</td><td>Maximum sensitivity — BAFS mode</td></tr>
</table>
<p>Note: Values 3, 5, 7+ are not documented. The fuzzer probes these gaps for hidden behavior.</p>
</div>
<!-- SLIDE 10: Sample Upload -->
<div class="slide" id="slide-10">
<h1>Sample Upload Flow</h1>
<p class="subtitle">Cloud-triggered file upload to Azure Blob Storage for detonation</p>
<div class="flow">
<div class="flow-box highlight">
<div class="label">Step 1</div>
<div class="value">Send file scan report</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box warn">
<div class="label">Step 2</div>
<div class="value">Server responds with SampleRequest</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box" style="border-color:var(--accent2);min-width:400px">
<div class="label">SampleRequest Fields</div>
<div class="value" style="text-align:left;font-size:12px">
F3: RequestGuid (STRING)<br>
F6: SHA1 (STRING)<br>
F12: <strong>BlobSasUri</strong> — Azure upload URL with SAS token<br>
F15: TTL (UINT64)<br>
F18: Compression ("gzip")<br>
F21: UseQuarantine (BOOL)
</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box highlight">
<div class="label">Step 3</div>
<div class="value">HTTP PUT file bytes to BlobSasUri</div>
</div>
<div class="flow-arrow">↓</div>
<div class="flow-box success">
<div class="label">Step 4</div>
<div class="value">Azure sandbox detonates file → verdicts published</div>
</div>
</div>
<h2>Upload Headers</h2>
<pre>
PUT <blob_sas_uri> HTTP/1.1
Content-Type: application/octet-stream
x-ms-blob-type: BlockBlob
Content-Encoding: gzip ← If compression requested
x-ms-meta-compression: gzip
Content-Length: <size></pre>
</div>
<!-- SLIDE 11: Response Parsing -->
<div class="slide" id="slide-11">
<h1>Response Parsing</h1>
<p class="subtitle">Decoding the Bond response from MAPS cloud</p>
<h2>Response Schema</h2>
<pre>
SubmitSpynetReportResult {
F5: Schema = "Microsoft.ProtectionServices.Entities.Raw.SubmitSpynetReportResult"
F6: SpynetReportResponse = LIST<STRUCT>[1] {
<span style="color:var(--accent)">F3: Revision</span> = UINT8(5) ← Protocol version
<span style="color:var(--accent)">F6: SampleRate</span> = INT32(1) ← Telemetry sampling
<span style="color:var(--accent3)">F9: SampleRequests</span> = LIST<STRUCT> ← Upload requests (if any)
<span style="color:var(--danger)">F12: SignaturePatches</span> = LIST<STRUCT> ← FASTPATH signatures!
<span style="color:var(--accent)">F15: UrlResponse</span> = STRUCT ← URL reputation result
<span style="color:var(--danger)">F18: ThreatDetailElements</span> = LIST<STRUCT>
<span style="color:var(--accent2)">F21: CertificateResponse</span> = STRUCT
<span style="color:var(--accent2)">F24: OnboardingResponse</span> = STRUCT
}
F10: RuntimeType = STRUCT ← Runtime type info
}</pre>
<h2>Verdict Logic</h2>
<div class="grid-3">
<div class="card" style="border-color:var(--accent3)">
<div class="card-title" style="color:var(--accent3)">CLEAN</div>
<div class="card-body">
Response has Revision + SampleRate<br>
but <strong>NO</strong> SignaturePatches or ThreatDetails.<br><br>
Typical size: <strong>88 bytes</strong>
</div>
</div>
<div class="card" style="border-color:var(--danger)">
<div class="card-title" style="color:var(--danger)">MALICIOUS</div>
<div class="card-body">
SignaturePatches present (FASTPATH blob)<br>
OR ThreatDetails with threat ID/name.<br><br>
Typical size: <strong>~488 bytes</strong>
</div>
</div>
<div class="card" style="border-color:var(--warn)">
<div class="card-title" style="color:var(--warn)">SAMPLE REQUESTED</div>
<div class="card-body">
SampleRequests list present with<br>
BlobSasUri for Azure upload.<br><br>
Cloud wants the file!
</div>
</div>
</div>
<h2>Response Sizes</h2>
<table class="tbl">
<tr><th>Scenario</th><th>Size</th><th>Contents</th></tr>
<tr><td>Clean / unknown file</td><td>88 bytes</td><td>Revision=5, SampleRate=1</td></tr>
<tr><td>Known threat + FASTPATH</td><td>~488 bytes</td><td>88 base + 385B FASTPATH blob</td></tr>
<tr><td>Known threat (cached)</td><td>88 bytes</td><td>FASTPATH already delivered to this GUID</td></tr>
</table>
</div>
<!-- SLIDE 12: FASTPATH Signatures -->
<div class="slide" id="slide-12">
<h1>FASTPATH Dynamic Signatures</h1>
<p class="subtitle">VDM TLV format — real-time threat definitions delivered from cloud</p>
<h2>TLV Entry Format</h2>
<pre>
┌──────────┬──────────┬───────────┬──────────────────┐
│ type (1) │ size_lo │ size_hi │ payload (size) │
│ 1 byte │ 1 byte │ 2 bytes │ variable │
└──────────┴──────────┴───────────┴──────────────────┘
size = size_lo | (size_hi << 8) ← 24-bit little-endian</pre>
<h2>Known Entry Types</h2>
<table class="tbl">
<tr><th>Type</th><th>Name</th><th>Description</th></tr>
<tr><td><code>0x5C</code></td><td><span class="badge badge-red">THREAT_BEGIN</span></td><td>Start of threat group: ThreatID (4B) + Flags (4B) + DetectionName</td></tr>
<tr><td><code>0x5D</code></td><td>THREAT_END</td><td>End of threat group: ThreatID (4B)</td></tr>
<tr><td><code>0x67</code></td><td><span class="badge badge-blue">STATIC</span></td><td>Hash-based detection: CRC32 + MD5 + SHA1</td></tr>
<tr><td><code>0x80</code></td><td>KCRCE</td><td>CRC-based detection entry</td></tr>
<tr><td><code>0xAA</code></td><td><span class="badge badge-green">FASTPATH_DATA</span></td><td>Metadata: compilation timestamp + config flags</td></tr>
<tr><td><code>0xAB</code></td><td>FASTPATH_SDN</td><td>Static Detection Name</td></tr>
<tr><td><code>0xD8</code></td><td>FASTPATH_TDN</td><td>Threat Detection Name</td></tr>
<tr><td><code>0xDA</code></td><td>FASTPATH_SDN_EX</td><td>Extended SDN</td></tr>
<tr><td><code>0xEC</code></td><td><span class="badge badge-purple">ENVELOPE</span></td><td>Encrypted detection logic (AES, 256B typical)</td></tr>
<tr><td><code>0xEE</code></td><td>OUTER_WRAPPER</td><td>V3 FASTPATH outer type with stream headers</td></tr>
</table>
<h2>EICAR Response Example (385 bytes)</h2>
<pre>
<span style="color:var(--accent2)">[0xEC ENVELOPE]</span> 256 bytes — Encrypted detection logic (RSA-2048 + AES)
<span style="color:var(--accent3)">[0xAA FASTPATH_DATA]</span> 20 bytes — Compilation timestamp, config flags
<span style="color:var(--danger)">[0x5C THREAT_BEGIN]</span> 47 bytes — ThreatID=2147519003
"Virus:DOS/EICAR_Test_File"
<span style="color:var(--accent)">[0x67 STATIC]</span> 38 bytes — SHA1 + MD5 + CRC32 of EICAR
[0x5D THREAT_END] 4 bytes — ThreatID=2147519003 (closing)</pre>
</div>
<!-- SLIDE 13: SpynetReport Schema -->
<div class="slide" id="slide-13">
<h1>SpynetReport Schema</h1>
<p class="subtitle">372 Bond fields reverse-engineered from mpengine.dll RTTI vtable analysis</p>
<h2>Top-Level Fields (Key Selection)</h2>
<table class="tbl">
<tr><th>Ordinal</th><th>Name</th><th>Type</th><th>Purpose</th></tr>
<tr><td>F10</td><td>ReportTime</td><td>INT64</td><td>.NET DateTime ticks</td></tr>
<tr><td>F20</td><td>Revision</td><td>LIST<INT16></td><td>Schema version (3)</td></tr>
<tr><td>F30</td><td>MachineGuid</td><td>STRING</td><td>Client UUID identity</td></tr>
<tr><td>F40-F80</td><td>Version strings</td><td>STRING</td><td>AV sig, engine, NRI versions</td></tr>
<tr><td>F90</td><td>IsHeartBeat</td><td>UINT8</td><td>Heartbeat flag</td></tr>
<tr><td>F150-F220</td><td>System info</td><td>mixed</td><td>OS, geo, locale, CPU</td></tr>
<tr><td>F280</td><td>ProductGuid</td><td>STRING</td><td>Session GUID</td></tr>
<tr><td><strong>F390</strong></td><td><strong>FileReportElements</strong></td><td>LIST<LIST<STRUCT>></td><td>File scan reports</td></tr>
<tr><td>F580</td><td>IsMsftInternal</td><td>UINT8</td><td>Microsoft internal flag</td></tr>
<tr><td>F590</td><td>TestHook</td><td>STRING</td><td>Test/debug hook</td></tr>
<tr><td>F920-F940</td><td>Heartbeat fields</td><td>mixed</td><td>HB type, control group</td></tr>
<tr><td>F1190</td><td>NetworkConnElements</td><td>LIST<STRUCT></td><td>Network telemetry V1</td></tr>
<tr><td>F1275</td><td>AmsiUacInfos</td><td>LIST<STRUCT></td><td>UAC elevation telemetry</td></tr>
<tr><td>F1373</td><td>CloudBlockLevel</td><td>UINT32</td><td>Block sensitivity</td></tr>
<tr><td><strong>F1542</strong></td><td><strong>UrlReport</strong></td><td>LIST<STRUCT></td><td>URL reputation query</td></tr>
</table>
<h2>Nested Schema Classes</h2>
<div class="grid-3">
<div class="card">
<div class="card-title">FileReport (12 fields)</div>
<div class="card-body">Revision, Index, CoreReport, PrevalentFileRpt, ParentIndices, ChildIndices, CollectReason</div>
</div>
<div class="card">
<div class="card-title">CoreReport (239 fields)</div>
<div class="card-body">FileName, Hashes (MD5/SHA1/SHA256/CRC), ReportType, ThreatID, AMSI fields, Signer, ImpHash</div>
</div>
<div class="card">
<div class="card-title">UrlReport (6 fields)</div>
<div class="card-body">UrlReportGuid, UrlList, UrlContext, SigSeq, SigSha, ReportOnly</div>
</div>
<div class="card">
<div class="card-title">ThreatDetails (11 fields)</div>
<div class="card-body">ThreatID, Category, Name, Severity, Advice, SigInfoElements, DropType, TTL</div>
</div>
<div class="card">
<div class="card-title">AmsiUacInfo (30 fields)</div>
<div class="card-body">Type, Identifier, Blocked, TrustedState, ExeAppName, CmdLine, COM/MSI/ActiveX/PkApp</div>
</div>
<div class="card">
<div class="card-title">NetworkConnV2 (21 fields)</div>
<div class="card-body">IPv4/IPv6, Ports, Protocol, Direction, Bytes in/out, URI</div>
</div>
</div>
</div>
<!-- SLIDE 14: Endpoints & Auth -->
<div class="slide" id="slide-14">
<h1>All Endpoints & Authentication</h1>
<p class="subtitle">Complete endpoint map with geo-affinity and failover</p>
<h2>Primary Endpoints</h2>
<table class="tbl">
<tr><th>Endpoint</th><th>URL</th><th>Purpose</th></tr>
<tr><td><span class="badge badge-green">Production</span></td><td><code>wdcp.microsoft.com</code></td><td>Main MAPS cloud</td></tr>
<tr><td><span class="badge badge-blue">Failover</span></td><td><code>wdcpalt.microsoft.com</code></td><td>Backup if primary fails</td></tr>
<tr><td><span class="badge badge-yellow">Pre-Production</span></td><td><code>fastpath.wdcpppe.microsoft.com</code></td><td>Testing/PPE environment</td></tr>
<tr><td><span class="badge badge-purple">FASTPATH Prod</span></td><td><code>fastpath.wdcp.microsoft.com</code></td><td>Dynamic signature delivery</td></tr>
<tr><td><span class="badge badge-purple">FASTPATH PPE</span></td><td><code>fastpath.wdcpppe.microsoft.com</code></td><td>Testing signatures</td></tr>
</table>
<h2>Geo-Affinity Endpoints (Data Residency)</h2>
<div class="grid-2">
<div class="card"><div class="card-title">US</div><div class="card-body"><code>unitedstates.cp.wd.microsoft.com</code></div></div>
<div class="card"><div class="card-title">EU</div><div class="card-body"><code>europe.cp.wd.microsoft.com</code></div></div>
<div class="card"><div class="card-title">UK</div><div class="card-body"><code>unitedkingdom.cp.wd.microsoft.com</code></div></div>
<div class="card"><div class="card-title">AU</div><div class="card-body"><code>australia.cp.wd.microsoft.com</code></div></div>
</div>
<h2>API Paths</h2>
<table class="tbl">
<tr><th>Path</th><th>Protocol</th><th>Status</th></tr>
<tr><td><code>/wdcp.svc/bond/submitreport</code></td><td>Bond CompactBinaryV1</td><td><span class="badge badge-green">Active</span></td></tr>
<tr><td><code>/wdcp.svc/submitReport</code></td><td>Legacy REST</td><td><span class="badge badge-yellow">Unknown</span></td></tr>
<tr><td><code>/wdcp.svc/entraReport</code></td><td>Entra ID/Enterprise</td><td><span class="badge badge-purple">Enterprise</span></td></tr>
<tr><td><code>/WdCpSrvc.asmx</code></td><td>WS-Security SOAP</td><td><span class="badge badge-red">Dead (404)</span></td></tr>
</table>
</div>
<!-- SLIDE 15: Attack Surface & Fuzzing -->
<div class="slide" id="slide-15">
<h1>Attack Surface & Fuzzing Targets</h1>
<p class="subtitle">Where to look for hidden features, undocumented behavior, and security gaps</p>
<h2>Fuzzer Modules (fuzz_maps.py)</h2>
<table class="tbl">
<tr><th>Module</th><th>What It Probes</th><th>Looking For</th></tr>
<tr><td><code>hidden</code></td><td>IsMsftInternal, TestHook, IsBeta, QueryOnly, MapsOrigin, VdiType, IsPassiveMode, AsimovDeviceTicket, PartnerGuid, multi-file, compression</td><td>Hidden features unlocked by flags</td></tr>
<tr><td><code>paths</code></td><td>70+ URL paths</td><td>Undiscovered WCF/REST endpoints</td></tr>
<tr><td><code>report-types</code></td><td>ReportType 0-65535</td><td>Undocumented report types beyond 1-7</td></tr>
<tr><td><code>headers</code></td><td>50+ HTTP header variations</td><td>Debug/preview/insider header gates</td></tr>
<tr><td><code>fields</code></td><td>200+ SpynetReport field ordinals</td><td>Server reaction to unknown fields</td></tr>
<tr><td><code>schemas</code></td><td>20+ Bond schema names</td><td>Alternative schema acceptance</td></tr>
<tr><td><code>endpoints</code></td><td>25+ hostname variations</td><td>Undiscovered regional endpoints</td></tr>
<tr><td><code>versions</code></td><td>OS, engine, platform, sig versions</td><td>Version-gated features</td></tr>
<tr><td><code>customer-types</code></td><td>30+ customer type values</td><td>Role-gated functionality</td></tr>
<tr><td><code>block-levels</code></td><td>CloudBlockLevel 0-255</td><td>Undocumented sensitivity levels</td></tr>
<tr><td><code>heartbeat-types</code></td><td>HeartbeatType 0-255</td><td>Undocumented heartbeat subtypes</td></tr>
<tr><td><code>bond-types</code></td><td>Wire type mismatches</td><td>Parser edge cases and crashes</td></tr>
<tr><td><code>response-fields</code></td><td>Diverse requests → response analysis</td><td>Novel response field ordinals</td></tr>
</table>
<h2>High-Value Targets for Hidden Features</h2>
<div class="grid-2">
<div class="card" style="border-color:var(--danger)">
<div class="card-title">F580: IsMsftInternal</div>
<div class="card-body">UINT8 flag — does setting this to 1 unlock extended diagnostics, verbose responses, or internal-only features?</div>
</div>
<div class="card" style="border-color:var(--danger)">
<div class="card-title">F590: TestHook</div>
<div class="card-body">STRING field — what values does the server recognize? Could enable debug/trace modes, bypass checks, or return extended data.</div>
</div>
<div class="card" style="border-color:var(--warn)">
<div class="card-title">F340: QueryOnly</div>
<div class="card-body">STRING field — may toggle a read-only mode that returns reputation without telemetry side effects.</div>
</div>
<div class="card" style="border-color:var(--warn)">
<div class="card-title">F690: MapsOrigin</div>
<div class="card-body">STRING — "mdatp", "intune", "sccm" etc. May route to different backends or unlock enterprise-specific features.</div>
</div>
<div class="card" style="border-color:var(--accent2)">
<div class="card-title">CloudBlockLevel 3,5,7-15</div>
<div class="card-body">Known: 0,1,2,4,6. The gaps (3,5,7+) may map to undocumented sensitivity levels or special modes.</div>
</div>
<div class="card" style="border-color:var(--accent2)">
<div class="card-title">ReportType 8+</div>
<div class="card-body">Known: 1-7. Higher values may map to behavior reports, certificate queries, or preview features.</div>
</div>
</div>
<h2>Running the Fuzzer</h2>
<pre>
# Quick test — hidden feature probes
python fuzz_maps.py hidden
# Full sweep with proxy inspection
python fuzz_maps.py --proxy http://127.0.0.1:8080 --no-verify --verbose all