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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>
Challenges : IrisCTF 2023 - CTF fun for hackers of all skill levels
</title>
<meta content="A fun, lighthearted, and educational 48-hour online CTF aimed towards hackers of all levels. Takes place the first full Friday-to-Sunday weekend every year." name="description"/>
<meta content="" name="author"/>
<meta content="/static/img/favicon.png" property="og:image">
<link href="/static/img/favicon.png" rel="icon" type="image/png"/>
<link href="/static/theme.css-v-1.3.0r5.css" rel="stylesheet"/>
<script src="/static/theme_min.js">
</script>
</meta>
</head>
<body>
<div id="navbar">
<a href="/">
<img id="navbar-logo" src="/static/img/logo_navbar.png"/>
</a>
<div id="navbar-buttons">
<a href="/home.html">
Home
</a>
<a class="active" href="/challenges.html">
Challenges
</a>
<a href="/scoreboard.html">
Scoreboard
</a>
<a href="/profile.html">
</a>
<form action="/api" method="post">
</form>
</div>
</div>
<div id="body-content">
<div class="pre-category-name">
Challenge category:
</div>
<div class="category-name typewriter">
Networks
</div>
<div style="display:flex; flex-wrap:wrap">
<div class="decorator-square-container" style="transform: rotate(270deg)">
<div class="decorator-square-component" style="background-color:#009927">
</div>
<div class="decorator-square-component title-decorator-gray">
</div>
<div class="decorator-square-component decorator-square-icon" style="background-image: url('/static/img/icons/arrow.png');background-size: 16px;filter:invert(1);">
</div>
</div>
<a class="btn-solid btn-solid-warning" href="challenges-category-Binary+Exploitation.html" style="margin:0px 8px 8px 0px">
Binary Exploitation
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Cryptography.html" style="margin:0px 8px 8px 0px">
Cryptography
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Forensics.html" style="margin:0px 8px 8px 0px">
Forensics
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Miscellaneous.html" style="margin:0px 8px 8px 0px">
Miscellaneous
</a>
<a class="btn-solid btn-solid-warning active" href="challenges-category-Networks.html" style="margin:0px 8px 8px 0px">
Networks
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Radio+Frequency.html" style="margin:0px 8px 8px 0px">
Radio Frequency
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Reverse+Engineering.html" style="margin:0px 8px 8px 0px">
Reverse Engineering
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Web+Exploitation.html" style="margin:0px 8px 8px 0px">
Web Exploitation
</a>
<a class="btn-solid btn-solid-warning" href="challenges-category-Welcome.html" style="margin:0px 8px 8px 0px">
Welcome
</a>
</div>
<div style="margin-bottom: 8px">
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-22.html">
babyshark
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
50 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
I was going to call this challenge babynet, but I have that baby shark song stuck in my head... doo doo, doo doo doo baby shark...
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1057847042807967835/capture.zip" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px">
capture.zip
</img>
</div>
</a>
</div>
<div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px">
<b style="margin-right:8px">
By:
</b>
skat
</img>
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-37.html">
wi-the-fi
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
247 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
You're probably used to pcaps captured at layer 3 in promiscuous mode, but do you know what to do with a pcap captured at layer 2 in monitor mode?
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1060680667496726719/capture.zip" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px">
capture.zip
</img>
</div>
</a>
</div>
<div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
skat
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-40.html">
Needle in the Haystack Secure
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
498 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
I saw my arch-nemesis, Billy Bob Bobertson, in the library. He left his laptop open for 3 minutes to go use the restroom. Luckily, I had my BadUSB handy and gave myself a shell and then persistent remote access, and started running a few commands and capturing his web traffic (shown in the attached screenshot). I think he's up to something suspicious and received some sort of message from a group of criminals.
</p>
<p>
<br>
</p>
<p>
They say that looking through a pcap is like finding a needle in a haystack, but what do you do if that haystack is encrypted?
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1060766301737467944/files.zip" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px">
files.zip
</img>
</div>
</a>
</div>
<div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
skat
</div>
</div>
</div>
<div class="card">
<div class="card-header">
<div style="display:flex">
<a href="challenge-id-31.html">
MICHAEL
</a>
<div class="challenge-points">
<img src="/static/img/icons/flag.png"/>
500 Points
</div>
</div>
<small>
</small>
</div>
<div class="card-content">
<p>
We had a rat infestation so I put mousetraps everywhere. Now I can code in peace without rats!
</p>
<p>
<br>
</p>
<p>
I'm a networks guy, so I was doing some network coding the other day when I picked up these interesting transmissions from some not-exactly-802.11 devices. There seems to be some presumably low-power wireless device somewhere transmitting data continuously, like a fountain! I think it's transmitting the flag, but I don't understand its transmissions. Can you recover it?
</p>
<div style="margin-top:8px; display:flex; flex-wrap: wrap">
<a href="https://cdn.discordapp.com/attachments/1056103369695047750/1060040627556974693/capture.zip" style="text-decoration:none; margin-right:8px; margin-bottom:8px" target="_blank">
<div class="tag tag-inline btn-solid btn-solid-link" style="margin-bottom:0px">
<img src="/static/img/icons/package.png" style="width:20px; height:20px; margin-right:8px">
capture.zip
</img>
</div>
</a>
</div>
<div>
<div class="tag tag-inline">
<img src="/static/img/icons/info.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
Hint!
</b>
<p>
Wireshark's protocol analyzer may be misleading. Analyze it yourself.
</p>
</div>
<div class="tag tag-inline">
<img src="/static/img/icons/info.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
Hint!
</b>
<p>
I can do network coding without rats. Ratless network coding!
</p>
</div>
<div class="tag tag-inline">
<img src="/static/img/icons/info.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
Hint!
</b>
<p>
I cannot stress this enough: Wireshark's protocol analyzer, and most tools' protocol analyzers, may mislead you. You should analyze the data yourself! The 802.15.4 sequence and src/dest format are very standard. What comes after? This challenge requires a lot of protocol analysis as well as a mathematical part at the end!
</p>
</div>
</div>
<div class="tag tag-inline" style="margin-bottom:0px">
<img src="/static/img/icons/user.png" style="width:20px; height:20px; margin-right:8px"/>
<b style="margin-right:8px">
By:
</b>
skat
</div>
</div>
</div>
</div>
<div id="footer">
<b>
<a href="https://github.com/Milkdrop/CTFx">
CTFx
</a>
</b>
v1.3.0r5
<br/>
Made with 🧡 by
<a href="https://gitlab.com/Milkdrop">
Milkdrop
</a>
, Based on
<a href="https://github.com/Nakiami/mellivora">
mellivora
</a>
</div>
<audio id="audio-typewriter" src="/static/audio/typewriter.mp3">
</audio>
<audio id="audio-nav-mouseover" src="/static/audio/nav_mouseover.mp3">
</audio>
<audio id="audio-nav-click" src="/static/audio/nav_click.mp3">
</audio>
<audio id="audio-btn-dynamic-mouseover" src="/static/audio/btn_dynamic_mouseover.mp3">
</audio>
<audio id="audio-btn-dynamic-click" src="/static/audio/btn_dynamic_click.mp3">
</audio>
<audio id="audio-btn-solid-mouseover" src="/static/audio/btn_solid_mouseover.mp3">
</audio>
<audio id="audio-btn-solid-click" src="/static/audio/btn_solid_click.mp3">
</audio>
<audio id="audio-checkbox-click" src="/static/audio/checkbox_click.mp3">
</audio>
<script src="/static/ctfx.js-v-1.3.0r5.js" type="text/javascript">
</script>
</body>
</html>