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<section id="title-slide">
  <h1 class="title">Introduction to Reverse Engineering</h1>
  <p class="author">Stefan Friese</p>
  <p class="date">02 November, 2023</p>
</section>

<section id="topics" class="slide level1">
<h1>Topics</h1>
<ul>
<li class="fragment">Effective Reverse Engineering</li>
<li class="fragment">Reversing with Ghidra</li>
</ul>
</section>
<section class="slide level1">

<h2 id="how-do-you-reverse">How Do You Reverse</h2>
<p>Reverse Engineering demands a lot of knowledge in multiple
fields.</p>
<p><strong>Some topics are</strong></p>
<ul>
<li class="fragment">Assembly Language</li>
<li class="fragment">ANSI C</li>
<li class="fragment">Other Languages</li>
<li class="fragment">Syscalls</li>
<li class="fragment">Cryptography</li>
</ul>
</section>
<section class="slide level1">

<p>How do you reverse engineer without knowing little about these
topics?</p>
</section>
<section class="slide level1">

<h2 id="reversing-is-work">Reversing is Work</h2>
<p>Work is a product of power by time.<br />
<code>P</code> is your power to solve an issue.</p>
<p><code>W = P x t</code></p>
<p>The smarter you tackle work, the less time you need to solve an
issue.</p>
</section>
<section class="slide level1">

<h2 id="knowledge-is-a-map">Knowledge is a Map</h2>
<p>You conventiently drive around the city using the underground. That’s
how you get to know the main spots of the city.</p>
<p><img src="./images/london_underground.jpg" alt="London Underground" width="50%" height="auto"></p>
</section>
<section class="slide level1">

<h2 id="knowledge-is-a-map-1">Knowledge is a Map</h2>
<p>Invest some time and explore deeper on foot. That’s how you get to
know the back alleys.</p>
<p><img src="./images/london_by_foot.jpg" alt="London by Foot" width="50%" height="auto"></p>
</section>
<section id="ghidra-an-overview" class="slide level1">
<h1>Ghidra – an Overview</h1>
</section>
<section class="slide level1">

<figure>
<img data-src="./images/Ghidra-Overview.png"
alt="Main View of Ghidra" />
<figcaption aria-hidden="true">Main View of Ghidra</figcaption>
</figure>
</section>
<section class="slide level1">

<h2 id="watch-out-for-low-hanging-fruits">Watch Out for Low Hanging
Fruits</h2>
</section>
<section class="slide level1">

<ul>
<li class="fragment">Data Segment</li>
<li class="fragment">Names of Functions</li>
<li class="fragment">Conditions &amp; Comparisons</li>
<li class="fragment">Strings: Usernames, Passwords</li>
<li class="fragment">URLs, IP &amp; Port Numbers</li>
</ul>
<p><strong>Do not try to understand the whole code at once, it will only
drive you mad.</strong></p>
</section>
<section class="slide level1">

<h3 id="data-segments">Data Segments</h3>
<figure>
<img data-src="./images/data-segments.png"
alt="A look into the read only data segment" />
<figcaption aria-hidden="true">A look into the read only data
segment</figcaption>
</figure>
</section>
<section class="slide level1">

<h3 id="name-of-functions">Name of Functions</h3>
<figure>
<img data-src="./images/symbol-tree.png"
alt="Functions contained in the binary a.k.a. Symbol Tree" />
<figcaption aria-hidden="true">Functions contained in the binary a.k.a.
Symbol Tree</figcaption>
</figure>
</section>
<section class="slide level1">

<h3 id="conditions-comparisions">Conditions &amp; Comparisions</h3>
<p><img src="./images/decompiled-code.png" alt="Input is Compared to a Hard Coded String" width="50%" height="auto"></p>
<p>Input is compared to a hard coded string</p>
</section>
<section class="slide level1">

<h3 id="function-graph">Function Graph</h3>
<p><img src="./images/function-graph.png" alt="Take a Look at the Flow Graph of Functions" width="50%" height="auto"></p>
<p>Take a look at the flow graph of functions</p>
</section>
<section class="slide level1">

<h3 id="strings">Strings</h3>
<p><img src="./defined-strings-menu.png" alt="Open the Defined Strings Menu" width="50%" height="auto"></p>
<p>Strings can not only be located in data but also in other code
segments, sometimes obfuscated</p>
</section>
<section class="slide level1">

<h3 id="strings-1">Strings</h3>
<figure>
<img data-src="./images/defined-strings.png" alt="An old friend" />
<figcaption aria-hidden="true">An old friend</figcaption>
</figure>
</section>
<section class="slide level1">

<h3 id="do-it-yourselves">Do It Yourselves!</h3>
<ul>
<li class="fragment"><a href="https://ghidra-sre.org/">Download
Ghidra</a></li>
<li class="fragment"><a href="https://crackmes.one">Download binaries at
crackmes.one</a></li>
<li class="fragment"><a href="https://hackthebox.eu">Find more binaries
on hackthebox</a></li>
<li class="fragment"><a href="https://tryhackme.com">Or Find even more
on tryhackme</a></li>
<li class="fragment">Download firmware of your favorite IoT
appliances</li>
</ul>
</section>
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