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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Like Finding a Needle in the Hay Stack - Instruo CTF 2025</title>
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min-height: 100vh;
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<h1 class="text-4xl font-bold text-white">Like Finding a Needle in the Hay Stack</h1>
</div>
<div class="flex flex-wrap gap-3">
<span class="inline-flex items-center px-3 py-1 rounded-full text-sm font-medium bg-gray-700 text-white">
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</svg>
Steganography
</span>
<span class="inline-flex items-center px-3 py-1 rounded-full text-sm font-medium bg-red-700 text-white">
500 pts
</span>
<span class="inline-flex items-center px-3 py-1 rounded-full text-sm font-medium bg-orange-600 text-white">
Hard
</span>
</div>
</div>
<!-- Challenge Information -->
<div class="content-section">
<h2 class="text-2xl font-bold mb-4 flex items-center">
<svg class="w-6 h-6 mr-2 text-blue-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
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</svg>
Challenge Information
</h2>
<ul class="space-y-2">
<li><strong>Challenge Name:</strong> Like Finding a Needle in the Hay Stack</li>
<li><strong>Category:</strong> Steganography</li>
<li><strong>Points:</strong> 500 pts</li>
<li><strong>Teams Solved:</strong> 0</li>
<li><strong>Description:</strong> "The flag is here, I believe, I can hear see it already. Note: A lot of fake flags here, you have been warned."</li>
<li><strong>Initial File:</strong> absolutely_normal.zip</li>
<li><strong>Real Flag:</strong> <code class="text-green-600">EOF{b3war3_!t$_c0m!ng_f0r_u}</code> ✅</li>
</ul>
</div>
<!-- Table of Contents -->
<div class="content-section">
<h2 class="text-2xl font-bold mb-4 flex items-center">
<svg class="w-6 h-6 mr-2 text-blue-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
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</svg>
Table of Contents
</h2>
<ul class="list-disc list-inside space-y-2">
<li><a href="#phase1" class="text-blue-600 hover:underline">Phase 1: Initial Extraction</a></li>
<li><a href="#phase2" class="text-blue-600 hover:underline">Phase 2: Hunt for Obvious Flags (Fake Flags)</a></li>
<li><a href="#phase3" class="text-blue-600 hover:underline">Phase 3: Deep Steganography Analysis</a></li>
<li><a href="#phase4" class="text-blue-600 hover:underline">Phase 4: Extract Hidden MP3</a></li>
<li><a href="#phase5" class="text-blue-600 hover:underline">Phase 5: MP3 Metadata Analysis (The Real Flag)</a></li>
<li><a href="#phase6" class="text-blue-600 hover:underline">Phase 6: Decode the Real Flag</a></li>
<li><a href="#summary" class="text-blue-600 hover:underline">Summary of All Flags</a></li>
</ul>
</div>
<!-- Phase 1 -->
<div id="phase1" class="content-section">
<h2 class="text-2xl font-bold mb-4 flex items-center">
<svg class="w-6 h-6 mr-2 text-green-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"></path>
</svg>
Phase 1: Initial Extraction
</h2>
<h3 class="text-xl font-semibold mb-3 mt-6">Step 1: Extract ZIP Archive</h3>
<pre><code class="language-bash">unzip absolutely_normal.zip
# Extracted: absolutely_normal.png (2.5 MB)</code></pre>
<h3 class="text-xl font-semibold mb-3 mt-6">Step 2: File Analysis</h3>
<pre><code class="language-bash">file absolutely_normal.png
# Output: PNG image data, 1920 x 1080, 8-bit/color RGB, non-interlaced
# Observation: 2.5 MB is reasonable but could contain hidden data</code></pre>
</div>
<!-- Phase 2 -->
<div id="phase2" class="content-section">
<h2 class="text-2xl font-bold mb-4 flex items-center">
<svg class="w-6 h-6 mr-2 text-yellow-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z"></path>
</svg>
Phase 2: Hunt for Obvious Flags (Fake Flags)
</h2>
<h3 class="text-xl font-semibold mb-3">Step 3: String Search for EOF{} Patterns</h3>
<pre><code class="language-bash">strings absolutely_normal.png | grep "EOF{"</code></pre>
<p class="mb-3"><strong>Flags Found (Both FAKE)</strong>:</p>
<ol class="list-decimal list-inside space-y-2 mb-4">
<li><code>EOF{this_is_not_a_real_flag}</code> ❌ - Obviously fake by its own admission</li>
<li><code>EOF{F00l'$_3rr@nd}</code> ❌ - Name literally means "Fool's Errand", also appears in MP3 Comment field (double decoy)</li>
</ol>
<div class="bg-yellow-50 border-l-4 border-yellow-400 p-4 mb-4">
<p class="text-sm"><strong>Note:</strong> These are the "lot of fake flags" mentioned in the challenge description!</p>
</div>
</div>
<!-- Phase 3 -->
<div id="phase3" class="content-section">
<h2 class="text-2xl font-bold mb-4 flex items-center">
<svg class="w-6 h-6 mr-2 text-purple-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9.663 17h4.673M12 3v1m6.364 1.636l-.707.707M21 12h-1M4 12H3m3.343-5.657l-.707-.707m2.828 9.9a5 5 0 117.072 0l-.548.547A3.374 3.374 0 0014 18.469V19a2 2 0 11-4 0v-.531c0-.895-.356-1.754-.988-2.386l-.548-.547z"></path>
</svg>
Phase 3: Deep Steganography Analysis
</h2>
<h3 class="text-xl font-semibold mb-3">Step 4: PNG Structure Examination</h3>
<pre><code class="language-bash">hexdump -C absolutely_normal.png | grep -A 5 "IEND"</code></pre>
<p class="mb-3"><strong>Critical Discovery:</strong> Data exists after the PNG IEND marker (end of PNG). This is a classic steganography technique: appending files to PNG</p>
<h3 class="text-xl font-semibold mb-3 mt-6">Step 5: Binwalk Analysis</h3>
<pre><code class="language-bash">binwalk absolutely_normal.png</code></pre>
<p class="mb-3"><strong>Output:</strong></p>
<pre><code>DECIMAL HEXADECIMAL DESCRIPTION
--------------------------------------------------------------------------------
0 0x0 PNG image, 1920 x 1080
82096 0x140B0 Zip archive data</code></pre>
<p class="mb-3"><strong>Discoveries:</strong></p>
<ul class="list-disc list-inside space-y-2">
<li>ZIP archive at offset 82096</li>
<li>PDF file (a.pdf) embedded</li>
<li>MP3 audio file embedded ← <strong>This is the key!</strong></li>
</ul>
</div>
<!-- Phase 4 -->
<div id="phase4" class="content-section">
<h2 class="text-2xl font-bold mb-4 flex items-center">
<svg class="w-6 h-6 mr-2 text-indigo-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 19V6l12-3v13M9 19c0 1.105-1.343 2-3 2s-3-.895-3-2 1.343-2 3-2 3 .895 3 2zm12-3c0 1.105-1.343 2-3 2s-3-.895-3-2 1.343-2 3-2 3 .895 3 2zM9 10l12-3"></path>
</svg>
Phase 4: Extract Hidden MP3
</h2>
<h3 class="text-xl font-semibold mb-3">Step 6: Extract MP3 from PNG</h3>
<pre><code class="language-bash">dd if=absolutely_normal.png of=extracted.mp3 bs=1 skip=82096
# Alternative using binwalk:
binwalk -e absolutely_normal.png</code></pre>
<p class="mb-3"><strong>Result:</strong></p>
<ul class="list-disc list-inside space-y-2">
<li>extracted.mp3 successfully extracted</li>
<li>Format: MPEG-1 Layer 3</li>
<li>Bitrate: 192 kbps</li>
<li>Sample Rate: 44.1 kHz</li>
<li>Duration: ~1 minute 44 seconds</li>
</ul>
<h3 class="text-xl font-semibold mb-3 mt-6">Step 7: Listen to Audio (Hint Analysis)</h3>
<p class="mb-3"><strong>Observation:</strong> No obvious audio steganography (no morse code, hidden speech, etc.)</p>
<p>The challenge hint: "I can hear see it already" → <strong>Metadata, not audio content!</strong></p>
</div>
<!-- Phase 5 -->
<div id="phase5" class="content-section">
<h2 class="text-2xl font-bold mb-4 flex items-center">
<svg class="w-6 h-6 mr-2 text-green-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M7 7h.01M7 3h5c.512 0 1.024.195 1.414.586l7 7a2 2 0 010 2.828l-7 7a2 2 0 01-2.828 0l-7-7A1.994 1.994 0 013 12V7a4 4 0 014-4z"></path>
</svg>
Phase 5: MP3 Metadata Analysis (The Real Flag)
</h2>
<h3 class="text-xl font-semibold mb-3">Step 8: Extract All MP3 Metadata</h3>
<pre><code class="language-bash">exiftool extracted.mp3</code></pre>
<p class="mb-3"><strong>Complete Output:</strong></p>
<pre><code>Title : Absolutely Normal
Year : 2024
Needle : FP.G{.c3x.bs.3_!.u$._d0.n!o.h_.g0.s_v.}
Comment : (Audio_Info) EOF{F00l'$_3rr@nd}</code></pre>
<div class="bg-red-50 border-l-4 border-red-400 p-4 mb-4">
<p class="font-semibold mb-2">CRITICAL FINDINGS:</p>
<ol class="list-decimal list-inside space-y-2">
<li><strong>"Comment" field:</strong> <code>EOF{F00l'$_3rr@nd}</code> ❌ - Another fake flag (fool's errand)</li>
<li><strong>"Needle" field:</strong> <code>FP.G{.c3x.bs.3_!.u$._d0.n!o.h_.g0.s_v.}</code> ⚠️ - This is suspiciously named "Needle" (challenge is "Finding a Needle in the Haystack"). Obfuscated format suggests encoding.</li>
</ol>
</div>
</div>
<!-- Phase 6 -->
<div id="phase6" class="content-section">
<h2 class="text-2xl font-bold mb-4 flex items-center">
<svg class="w-6 h-6 mr-2 text-blue-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 15v2m-6 4h12a2 2 0 002-2v-6a2 2 0 00-2-2H6a2 2 0 00-2 2v6a2 2 0 002 2zm10-10V7a4 4 0 00-8 0v4h8z"></path>
</svg>
Phase 6: Decode the Real Flag
</h2>
<h3 class="text-xl font-semibold mb-3">Step 9: Analyze the Obfuscation</h3>
<p class="mb-3"><strong>Obfuscated String:</strong></p>
<pre><code>FP.G{.c3x.bs.3_!.u$._d0.n!o.h_.g0.s_v.}</code></pre>
<p class="mb-3"><strong>Pattern Analysis:</strong></p>
<ul class="list-disc list-inside space-y-2">
<li>Dots (.) appear to be noise/padding</li>
<li>Letters seem shifted (FP.G → EOF?)</li>
<li>Numbers and special characters remain unchanged</li>
</ul>
<h3 class="text-xl font-semibold mb-3 mt-6">Step 10: Caesar Cipher Detection</h3>
<pre><code>F → E (shift back by 1)
P → O (shift back by 1)
G → F (shift back by 1)</code></pre>
<p class="mb-3"><strong>Method:</strong> Caesar cipher with +1 shift (each letter moved forward by 1)</p>
<p class="mb-3"><strong>Solution:</strong> Reverse the shift by -1</p>
<h3 class="text-xl font-semibold mb-3 mt-6">Step 11: Python Decryption Script</h3>
<pre><code class="language-python">#!/usr/bin/env python3
def caesar_decrypt(text, shift=1):
"""Decrypt Caesar cipher by shifting back"""
result = []
for char in text:
if char.isalpha():
base = ord('A') if char.isupper() else ord('a')
decrypted = chr((ord(char) - base - shift) % 26 + base)
result.append(decrypted)
else:
result.append(char)
return ''.join(result)
obfuscated = "FP.G{.c3x.bs.3_!.u$._d0.n!o.h_.g0.s_v.}"
decrypted = caesar_decrypt(obfuscated, shift=1)
cleaned = decrypted.replace('.', '').replace(' ', '')
print(f"Final: {cleaned}")</code></pre>
<p class="mb-3"><strong>Final Output:</strong></p>
<pre><code class="text-green-600">EOF{b3war3_!t$_c0m!ng_f0r_u}</code></pre>
<h3 class="text-xl font-semibold mb-3 mt-6">Step 12: Verify Flag Format</h3>
<p class="mb-3"><strong>Leetspeak Translation:</strong> "Beware, it's coming for you"</p>
<ul class="list-disc list-inside space-y-2">
<li>b3war3 = beware</li>
<li>!t$ = it's</li>
<li>c0m!ng = coming</li>
<li>f0r_u = for you</li>
</ul>
<div class="bg-green-50 border-l-4 border-green-400 p-4 mt-4">
<p class="font-semibold text-green-700">✅ CONFIRMED: This is the REAL flag!</p>
</div>
</div>
<!-- Summary -->
<div id="summary" class="content-section">
<h2 class="text-2xl font-bold mb-4 flex items-center">
<svg class="w-6 h-6 mr-2 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"></path>
</svg>
Summary of All Flags
</h2>
<table>
<thead>
<tr>
<th>Flag</th>
<th>Location</th>
<th>Type</th>
<th>Method</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>EOF{this_is_not_a_real_flag}</code></td>
<td>PNG strings</td>
<td>❌ Fake</td>
<td>Plaintext decoy</td>
</tr>
<tr>
<td><code>EOF{F00l'$_3rr@nd}</code></td>
<td>PNG strings + MP3 Comment</td>
<td>❌ Fake</td>
<td>Double decoy</td>
</tr>
<tr>
<td><code>EOF{b3war3_!t$_c0m!ng_f0r_u}</code></td>
<td>MP3 "Needle" metadata</td>
<td>✅ REAL</td>
<td>Caesar cipher +1 shift</td>
</tr>
</tbody>
</table>
</div>
<!-- Key Insights -->
<div class="content-section">
<h2 class="text-2xl font-bold mb-4 flex items-center">
<svg class="w-6 h-6 mr-2 text-purple-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
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Key Insights & Techniques
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<h3 class="text-xl font-semibold mb-3">Why This Challenge Was Clever:</h3>
<p class="font-semibold mt-4 mb-2">1. Multiple Layers of Deception:</p>
<ul class="list-disc list-inside space-y-2">
<li>2 obvious fake flags in PNG strings</li>
<li>1 fake flag in MP3 Comment field</li>
<li>Real flag hidden in obscure "Needle" metadata field</li>
</ul>
<p class="font-semibold mt-4 mb-2">2. Hint Analysis:</p>
<ul class="list-disc list-inside space-y-2">
<li>"hear see it already" → Audio + Visual = Metadata</li>
<li>"Needle in the Haystack" → Look for "Needle" field</li>
<li>"A lot of fake flags" → Don't trust obvious findings</li>
</ul>
<p class="font-semibold mt-4 mb-2">3. Encoding Methods:</p>
<ul class="list-disc list-inside space-y-2">
<li>Steganography: Appending MP3 to PNG</li>
<li>Obfuscation: Dots as noise</li>
<li>Cryptography: Caesar cipher (+1)</li>
</ul>
<h3 class="text-xl font-semibold mb-3 mt-6">Tools Used:</h3>
<ul class="list-disc list-inside space-y-2">
<li><code>unzip</code> - Extract ZIP</li>
<li><code>binwalk</code> - Detect embedded files</li>
<li><code>dd</code> - Extract binary data</li>
<li><code>exiftool</code> - <strong>Critical:</strong> Read MP3 metadata</li>
<li><code>strings</code> - Find text in binaries</li>
<li><code>Python</code> - Caesar cipher decryption</li>
</ul>
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Final Answer
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<p class="text-lg mb-4"><strong>The REAL flag is:</strong> <code class="text-green-600 text-xl">EOF{b3war3_!t$_c0m!ng_f0r_u}</code></p>
<ul class="space-y-2">
<li><strong>Found in:</strong> MP3 "Needle" metadata field (exiftool)</li>
<li><strong>Encoding:</strong> Caesar cipher (+1 shift) with dot noise</li>
<li><strong>Translation:</strong> "Beware, it's coming for you"</li>
</ul>
<p class="mt-4 italic">This challenge perfectly demonstrates why reading the hints carefully and not trusting obvious findings is crucial in CTF steganography challenges!</p>
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