349 lines
11 KiB
HTML
349 lines
11 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="generator" content="pandoc">
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<meta name="author" content="Stefan Friese">
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<title>Introduction to Reverse Engineering</title>
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<meta name="apple-mobile-web-app-capable" content="yes">
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<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
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<link rel="stylesheet" href="https://unpkg.com/reveal.js@^4//dist/reset.css">
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<link rel="stylesheet" href="https://unpkg.com/reveal.js@^4//dist/reveal.css">
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<style>
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.reveal .sourceCode { /* see #7635 */
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overflow: visible;
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}
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code{white-space: pre-wrap;}
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span.smallcaps{font-variant: small-caps;}
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div.column{flex: auto; overflow-x: auto;}
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/* The extra [class] is a hack that increases specificity enough to
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</style>
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<link rel="stylesheet" href="https://unpkg.com/reveal.js@^4//dist/theme/dracula.css" id="theme">
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</head>
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<body>
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<div class="reveal">
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<div class="slides">
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<section id="title-slide">
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<h1 class="title">Introduction to Reverse Engineering</h1>
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<p class="author">Stefan Friese</p>
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<p class="date">02 November, 2023</p>
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</section>
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<section id="topics" class="slide level1">
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<h1>Topics</h1>
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<ul>
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<li class="fragment">Effective Reverse Engineering</li>
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<li class="fragment">Reversing with Ghidra</li>
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</ul>
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</section>
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<section class="slide level1">
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<h2 id="how-do-you-reverse">How Do You Reverse</h2>
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<p>Reverse Engineering demands a lot of knowledge in multiple
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fields.</p>
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<p><strong>Some topics are</strong></p>
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<ul>
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<li class="fragment">Assembly Language</li>
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<li class="fragment">ANSI C</li>
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<li class="fragment">Other Languages</li>
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<li class="fragment">Syscalls</li>
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<li class="fragment">Cryptography</li>
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</ul>
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</section>
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<section class="slide level1">
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<p>How do you reverse engineer without knowing little about these
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topics?</p>
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</section>
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<section class="slide level1">
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<h2 id="reversing-is-work">Reversing is Work</h2>
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<p>Work is a product of power by time.<br />
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<code>P</code> is your power to solve an issue.</p>
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<p><code>W = P x t</code></p>
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<p>The smarter you tackle work, the less time you need to solve an
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issue.</p>
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</section>
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<section class="slide level1">
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<h2 id="knowledge-is-a-map">Knowledge is a Map</h2>
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<p>You conventiently drive around the city using the underground. That’s
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how you get to know the main spots of the city.</p>
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<p><img src="./images/london_underground.jpg" alt="London Underground" width="50%" height="auto"></p>
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</section>
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<section class="slide level1">
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<h2 id="knowledge-is-a-map-1">Knowledge is a Map</h2>
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<p>Invest some time and explore deeper on foot. That’s how you get to
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know the back alleys.</p>
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<p><img src="./images/london_by_foot.jpg" alt="London by Foot" width="50%" height="auto"></p>
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</section>
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<section id="ghidra-an-overview" class="slide level1">
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<h1>Ghidra – an Overview</h1>
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</section>
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<section class="slide level1">
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<figure>
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<img data-src="./images/Ghidra-Overview.png"
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alt="Main View of Ghidra" />
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<figcaption aria-hidden="true">Main View of Ghidra</figcaption>
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</figure>
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</section>
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<section class="slide level1">
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<h2 id="watch-out-for-low-hanging-fruits">Watch Out for Low Hanging
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Fruits</h2>
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</section>
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<section class="slide level1">
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<ul>
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<li class="fragment">Data Segment</li>
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<li class="fragment">Names of Functions</li>
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<li class="fragment">Conditions & Comparisons</li>
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<li class="fragment">Strings: Usernames, Passwords</li>
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<li class="fragment">URLs, IP & Port Numbers</li>
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</ul>
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<p><strong>Do not try to understand the whole code at once, it will only
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drive you mad.</strong></p>
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</section>
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<section class="slide level1">
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<h3 id="data-segments">Data Segments</h3>
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<figure>
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<img data-src="./images/data-segments.png"
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alt="A look into the read only data segment" />
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<figcaption aria-hidden="true">A look into the read only data
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segment</figcaption>
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</figure>
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</section>
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<section class="slide level1">
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<h3 id="name-of-functions">Name of Functions</h3>
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<figure>
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<img data-src="./images/symbol-tree.png"
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alt="Functions contained in the binary a.k.a. Symbol Tree" />
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<figcaption aria-hidden="true">Functions contained in the binary a.k.a.
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Symbol Tree</figcaption>
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</figure>
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</section>
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<section class="slide level1">
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<h3 id="conditions-comparisions">Conditions & Comparisions</h3>
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<p><img src="./images/decompiled-code.png" alt="Input is Compared to a Hard Coded String" width="50%" height="auto"></p>
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<p>Input is compared to a hard coded string</p>
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</section>
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<section class="slide level1">
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<h3 id="function-graph">Function Graph</h3>
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<p><img src="./images/function-graph.png" alt="Take a Look at the Flow Graph of Functions" width="50%" height="auto"></p>
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<p>Take a look at the flow graph of functions</p>
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</section>
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<section class="slide level1">
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<h3 id="strings">Strings</h3>
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<p><img src="./defined-strings-menu.png" alt="Open the Defined Strings Menu" width="50%" height="auto"></p>
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<p>Strings can not only be located in data but also in other code
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segments, sometimes obfuscated</p>
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</section>
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<section class="slide level1">
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<h3 id="strings-1">Strings</h3>
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<figure>
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<img data-src="./images/defined-strings.png" alt="An old friend" />
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<figcaption aria-hidden="true">An old friend</figcaption>
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</figure>
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</section>
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<section class="slide level1">
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<h3 id="do-it-yourselves">Do It Yourselves!</h3>
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<ul>
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<li class="fragment"><a href="https://ghidra-sre.org/">Download
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Ghidra</a></li>
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<li class="fragment"><a href="https://crackmes.one">Download binaries at
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crackmes.one</a></li>
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<li class="fragment"><a href="https://hackthebox.eu">Find more binaries
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on hackthebox</a></li>
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<li class="fragment"><a href="https://tryhackme.com">Or Find even more
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on tryhackme</a></li>
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<li class="fragment">Download firmware of your favorite IoT
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appliances</li>
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</ul>
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</section>
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</div>
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</div>
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<script src="https://unpkg.com/reveal.js@^4//dist/reveal.js"></script>
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</html>
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