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<article id="post-DozerCTF-iwanna" class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
<div class="article-meta">
<a href="/2021/05/30/DozerCTF-iwanna/" class="article-date">
<time class="dt-published" datetime="2021-05-30T13:59:22.000Z" itemprop="datePublished">2021-05-30</time>
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<header class="article-header">
<h1 itemprop="name">
<a class="p-name article-title" href="/2021/05/30/DozerCTF-iwanna/">DozerCTF_iwanna</a>
</h1>
</header>
<div class="e-content article-entry" itemprop="articleBody">
<p><strong>RE</strong></p>
<p>I wanna</p>
<p>下载附件，是知名游戏I wanna</p>
<p>玩一下</p>
<p><img src="https://i.loli.net/2021/05/30/taVxZqHJ59SGhA7.jpg" alt="img"></p>
<p><img src="https://i.loli.net/2021/05/30/tYK1TMrGikS2sVu.jpg" alt="img"></p>
<p>(手残党不玩了)</p>
<p>运行游戏是会生成save文件(用WinHex打开康康)</p>
<p><img src="https://i.loli.net/2021/05/30/5qdHVX3aOkDPfcK.jpg" alt="img"></p>
<p>猜测可能是关于关卡，人物狗die次数，游戏运行时间等信息，试了几次后找到让地图变化的位置：</p>
<p><img src="https://i.loli.net/2021/05/30/6cesXIa3lLAhCmz.jpg" alt="img"></p>
<p><img src="https://i.loli.net/2021/05/30/gpvJq5M9ktjnBfu.jpg" alt="img"></p>
<p>改变地图编号*(更改不存在的关卡号会报错)<em>后发现隐藏关卡</em>(01-45)*：</p>
<p><img src="https://i.loli.net/2021/05/30/gsJ2pERcUAu3VoP.jpg" alt="img"></p>
<p>看到Doz大致就可以去猜测了</p>
<p>此处更改人物位置来看到完整的flag</p>
<p><img src="https://i.loli.net/2021/05/30/cNlGzF9QK3IP1AS.jpg" alt="img"></p>
<p><img src="https://i.loli.net/2021/05/30/lutMPEeO4CUnXQI.jpg" alt="img"></p>
<p><img src="https://i.loli.net/2021/05/30/VchYzuS857k4xgQ.jpg" alt="img"></p>
<p>技术太菜，没法边玩边记，直接录屏，然后得出flag:</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">Dozerctf{i_wanna_To_be_THE_gay} </span><br></pre></td></tr></table></figure>
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<article id="post-ISCC-Garden" class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
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<a href="/2021/05/27/ISCC-Garden/" class="article-date">
<time class="dt-published" datetime="2021-05-27T02:21:08.000Z" itemprop="datePublished">2021-05-27</time>
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<a class="p-name article-title" href="/2021/05/27/ISCC-Garden/">ISCC Garden</a>
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<h5 id="ISCC-Garden-复现"><a href="#ISCC-Garden-复现" class="headerlink" title="ISCC Garden 复现"></a>ISCC Garden 复现</h5><p>下载附件，拿到garden.pyc</p>
<p>反编译一下</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">uncompyle6 -o test.py garden.pyc</span><br></pre></td></tr></table></figure>
<p>得到test.py文件</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># uncompyle6 version 3.7.4</span></span><br><span class="line"><span class="comment"># Python bytecode 2.7 (62211)</span></span><br><span class="line"><span class="comment"># Decompiled from: Python 3.8.5 (default, Jan 27 2021, 15:41:15) </span></span><br><span class="line"><span class="comment"># [GCC 9.3.0]</span></span><br><span class="line"><span class="comment"># Embedded file name: garden.py</span></span><br><span class="line"><span class="comment"># Compiled at: 2021-02-28 12:29:29</span></span><br><span class="line"><span class="keyword">import</span> platform, sys, marshal, types</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">check</span>(<span class="params">s</span>):</span></span><br><span class="line"> f = <span class="string">'2(88\x006\x1a\x10\x10\x1aIKIJ+\x1a\x10\x10\x1a\x06'</span></span><br><span class="line"> <span class="keyword">if</span> <span class="built_in">len</span>(s) != <span class="built_in">len</span>(f):</span><br><span class="line"> <span class="keyword">return</span> <span class="literal">False</span></span><br><span class="line"> checksum = <span class="number">0</span></span><br><span class="line"> <span class="keyword">for</span> a, b <span class="keyword">in</span> <span class="built_in">zip</span>(f, s):</span><br><span class="line"> checksum += <span class="built_in">ord</span>(b) ^ <span class="built_in">ord</span>(a) ^ <span class="number">123</span></span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> checksum == <span class="number">0</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span> sys.version_info.major != <span class="number">2</span> <span class="keyword">or</span> sys.version_info.minor != <span class="number">7</span>:</span><br><span class="line"> sys.exit(<span class="string">'试试 Python 2.7.'</span>)</span><br><span class="line"><span class="keyword">if</span> <span class="built_in">len</span>(sys.argv) != <span class="number">2</span>:</span><br><span class="line"> sys.exit(<span class="string">'usage: bronze.pyc <flag>'</span>)</span><br><span class="line">flag = sys.argv[<span class="number">1</span>]</span><br><span class="line"><span class="keyword">if</span> <span class="built_in">len</span>(flag) >= <span class="number">32</span>:</span><br><span class="line"> <span class="built_in">print</span> <span class="string">'太长了.'</span></span><br><span class="line"> sys.exit(<span class="number">1</span>)</span><br><span class="line">alphabet = <span class="built_in">set</span>(<span class="string">'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789{}!@#$%+'</span>)</span><br><span class="line"><span class="keyword">for</span> ch <span class="keyword">in</span> flag:</span><br><span class="line"> <span class="keyword">if</span> ch <span class="keyword">not</span> <span class="keyword">in</span> alphabet:</span><br><span class="line"> <span class="built_in">print</span> <span class="string">'不对.'</span></span><br><span class="line"> sys.exit(<span class="number">1</span>)</span><br><span class="line"></span><br><span class="line"><span class="keyword">if</span> check(flag):</span><br><span class="line"> <span class="built_in">print</span> <span class="string">'就是这个!'</span></span><br><span class="line"> sys.exit(<span class="number">0</span>)</span><br><span class="line"><span class="keyword">else</span>:</span><br><span class="line"> <span class="built_in">print</span> <span class="string">'搞错了.'</span></span><br><span class="line"> sys.exit(<span class="number">1</span>)</span><br><span class="line"><span class="comment"># okay decompiling garden.pyc</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<p>就是一个简单的异或处理</p>
<p>手写解密</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">f = <span class="string">'2(88\x006\x1a\x10\x10\x1aIKIJ+\x1a\x10\x10\x1a\x06'</span></span><br><span class="line">string = <span class="string">''</span></span><br><span class="line"><span class="keyword">for</span> a <span class="keyword">in</span> f:</span><br><span class="line"> flag = <span class="built_in">ord</span>(a) ^ <span class="number">123</span></span><br><span class="line"> string += <span class="built_in">chr</span>(flag)</span><br><span class="line"><span class="built_in">print</span>(string)</span><br></pre></td></tr></table></figure>
<p>得到flag</p>
<img src="https://i.loli.net/2021/05/27/rh6dpsqGyiYA1vJ.png" style="zoom:150%;">
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<time class="dt-published" datetime="2021-05-27T01:50:34.000Z" itemprop="datePublished">2021-05-27</time>
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<a class="p-name article-title" href="/2021/05/27/ISCC-Analysis/">ISCC Analysis</a>
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<h5 id="ISCC-Analysis-复现"><a href="#ISCC-Analysis-复现" class="headerlink" title="ISCC Analysis 复现"></a>ISCC Analysis 复现</h5><p>下载到附件(.exe文件)</p>
<p>程序有错就不运行了</p>
<p>康一下是32位文件</p>
<p><img src="https://i.loli.net/2021/05/27/Cva5kptWn1TRSMV.png" alt="image-20210527100619032"></p>
<p>IDA分析一下</p>
<p><img src="https://i.loli.net/2021/05/27/IQdth8fPTF3Hxyw.png"></p>
<p><img src="https://i.loli.net/2021/05/27/VOPIeoWpZi6lYjB.png"></p>
<p><img src="https://i.loli.net/2021/05/27/Qv1VAHDNuRXGhi2.png"></p>
<p>是对flag进行加密，key为”Reverse”</p>
<p>手动解密看看</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br></pre></td><td class="code"><pre><span class="line">a1=[<span class="number">67</span>,<span class="number">-33</span>,<span class="number">20</span>,<span class="number">3</span>,<span class="number">13</span>,<span class="number">44</span>,<span class="number">9</span>,<span class="number">1</span>,<span class="number">23</span>,<span class="number">23</span>,<span class="number">8</span>,<span class="number">-4</span>,<span class="number">43</span>,<span class="number">-6</span>,<span class="number">20</span>,<span class="number">23</span>,<span class="number">-7</span>,<span class="number">37</span>,<span class="number">-11</span>,<span class="number">34</span>,<span class="number">61</span>,<span class="number">-50</span>,<span class="number">24</span>,<span class="number">22</span>,<span class="number">10</span>,<span class="number">0</span>]</span><br><span class="line">str1 = <span class="string">"REVERSE"</span></span><br><span class="line"><span class="meta">#print(ord(str1[3]))</span></span><br><span class="line">a3=<span class="number">25</span></span><br><span class="line">print(a1)</span><br><span class="line">list1 = [<span class="number">0</span>]*<span class="number">7</span></span><br><span class="line">temp1 = <span class="number">0</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="keyword">for</span> p in range(len(str1)):</span><br><span class="line"> list1[p] = ord(str1[p])</span><br><span class="line"><span class="meta">#print(list1)</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">for</span> k in range(len(list1)):</span><br><span class="line"> list1[k] %= <span class="number">64</span></span><br><span class="line"><span class="meta">#print(list1)</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">for</span> n in range(<span class="number">100</span>):</span><br><span class="line"> <span class="meta">#print((list1[n%7]) & 1)</span></span><br><span class="line"> <span class="meta">#print(n)</span></span><br><span class="line"> <span class="keyword">if</span>(n>=a3):</span><br><span class="line"> <span class="meta">#print(n)</span></span><br><span class="line"> <span class="keyword">break</span></span><br><span class="line"> elif(((list1[n%<span class="number">7</span>]) & <span class="number">1</span>)!=<span class="number">0</span>):</span><br><span class="line"> temp1 = a1[n] - <span class="number">2</span></span><br><span class="line"> <span class="keyword">else</span>:</span><br><span class="line"> temp1 = a1[n] - <span class="number">1</span></span><br><span class="line"> a1[n] = temp1</span><br><span class="line"> <span class="meta">#print(temp1)</span></span><br><span class="line">print(a1)</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="keyword">for</span> m in range(<span class="keyword">int</span>(a3/<span class="number">2</span>)):</span><br><span class="line"> temp = a1[a3-m<span class="number">-1</span>]</span><br><span class="line"> a1[a3-m<span class="number">-1</span>] = a1[m]</span><br><span class="line"> a1[m] = temp</span><br><span class="line"></span><br><span class="line">print(a1)</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="keyword">for</span> l in range(a3):</span><br><span class="line"> <span class="meta">#print(l)</span></span><br><span class="line"> a1[l] -= list1[l%<span class="number">7</span>] </span><br><span class="line"></span><br><span class="line">print(a1)</span><br><span class="line"></span><br><span class="line"><span class="keyword">for</span> j in range(a3):</span><br><span class="line"> a1[a3-j<span class="number">-1</span>] = a1[a3-j] + a1[a3-j<span class="number">-1</span>] </span><br><span class="line"></span><br><span class="line">print(a1)</span><br><span class="line"></span><br><span class="line">string1 = <span class="string">""</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">for</span> i in range(a3):</span><br><span class="line"> a1[i] += <span class="number">64</span></span><br><span class="line"> string1 += chr(a1[i])</span><br><span class="line"></span><br><span class="line">print(string1)</span><br><span class="line"></span><br><span class="line"><span class="meta">#print(a1)</span></span><br></pre></td></tr></table></figure>
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<h5 id="ISCC-similar-复现"><a href="#ISCC-similar-复现" class="headerlink" title="ISCC similar 复现"></a>ISCC similar 复现</h5><p>下载附件后拿到一个.exe文件，直接执行看看</p>
<p> <img src="https://i.loli.net/2021/05/26/2TPeufao6B1McJd.png"></p>
<p>分析一波，是32位文件，直接逆向</p>
<p>康康主函数</p>
<p> <img src="https://i.loli.net/2021/05/26/iErvtVDa73gRx4S.png"></p>
<p>再看mix() 和 r_s()</p>
<p> <em>mix()</em></p>
<p> <img src="https://i.loli.net/2021/05/26/dfGD53T1HmkFaBR.png"></p>
<p> <em>r_s()</em></p>
<p> <img src="https://i.loli.net/2021/05/26/fj5g9kKpvVeYd8J.png"></p>
<p> <em>r_init()</em></p>
<p> <img src="https://i.loli.net/2021/05/26/1hzvnyNSx2jK4aY.png"></p>
<p> <em>r_crype()</em></p>
<p> <img src="https://i.loli.net/2021/05/26/rh2bHEm4S7T9cal.png"></p>
<p> 对比RC4加密</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">rc4_init</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">char</span> *s, <span class="keyword">unsigned</span> <span class="keyword">char</span> *key, <span class="keyword">unsigned</span> <span class="keyword">long</span> Len)</span> <span class="comment">//初始化函数</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> i =<span class="number">0</span>, j = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">char</span> k[<span class="number">256</span>] = {<span class="number">0</span>};</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> tmp = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">for</span> (i=<span class="number">0</span>;i<<span class="number">256</span>;i++) {</span><br><span class="line"> s[i] = i;</span><br><span class="line"> k[i] = key[i%Len];</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">for</span> (i=<span class="number">0</span>; i<<span class="number">256</span>; i++) {</span><br><span class="line"> j=(j+s[i]+k[i])%<span class="number">256</span>;</span><br><span class="line"> tmp = s[i];</span><br><span class="line"> s[i] = s[j]; <span class="comment">//交换s[i]和s[j]</span></span><br><span class="line"> s[j] = tmp;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">rc4_crypt</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">char</span> *s, <span class="keyword">unsigned</span> <span class="keyword">char</span> *Data, <span class="keyword">unsigned</span> <span class="keyword">long</span> Len)</span> <span class="comment">//加解密</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> i = <span class="number">0</span>, j = <span class="number">0</span>, t = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">long</span> k = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> tmp;</span><br><span class="line"> <span class="keyword">for</span>(k=<span class="number">0</span>;k<Len;k++) {</span><br><span class="line"> i=(i+<span class="number">1</span>)%<span class="number">256</span>;</span><br><span class="line"> j=(j+s[i])%<span class="number">256</span>;</span><br><span class="line"> tmp = s[i];</span><br><span class="line"> s[i] = s[j]; <span class="comment">//交换s[x]和s[y]</span></span><br><span class="line"> s[j] = tmp;</span><br><span class="line"> t=(s[i]+s[j])%<span class="number">256</span>;</span><br><span class="line"> Data[k] ^= s[t];</span><br><span class="line"> }</span><br><span class="line">} </span><br></pre></td></tr></table></figure>
<p>mix()主要是对flag和key进行一个小混淆</p>
<p>r_s()就是标准的RC4加密,不过最后和Str对比时，Str的范围不在0~256所以不方便用字符表示，故无法在线解密，手动解密一波。</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><stdio.h></span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><string.h></span></span></span><br><span class="line"><span class="comment">//#include "base64.h"</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">typedef</span> <span class="keyword">unsigned</span> <span class="keyword">long</span> ULONG;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">rc4_init</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">char</span> *s, <span class="keyword">unsigned</span> <span class="keyword">char</span> *key, <span class="keyword">unsigned</span> <span class="keyword">long</span> Len)</span> <span class="comment">//初始化函数</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> i =<span class="number">0</span>, j = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">char</span> k[<span class="number">256</span>] = {<span class="number">0</span>};</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> tmp = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">for</span> (i=<span class="number">0</span>;i<<span class="number">256</span>;i++) {</span><br><span class="line"> s[i] = i;</span><br><span class="line"> k[i] = key[i%Len];</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">for</span> (i=<span class="number">0</span>; i<<span class="number">256</span>; i++) {</span><br><span class="line"> j=(j+s[i]+k[i])%<span class="number">256</span>;</span><br><span class="line"> tmp = s[i];</span><br><span class="line"> s[i] = s[j]; <span class="comment">//交换s[i]和s[j]</span></span><br><span class="line"> s[j] = tmp;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">rc4_crypt</span><span class="params">(<span class="keyword">unsigned</span> <span class="keyword">char</span> *s, <span class="keyword">unsigned</span> <span class="keyword">char</span> *Data, <span class="keyword">unsigned</span> <span class="keyword">long</span> Len)</span> <span class="comment">//加解密</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">int</span> i = <span class="number">0</span>, j = <span class="number">0</span>, t = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">long</span> k = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> tmp;</span><br><span class="line"> <span class="keyword">for</span>(k=<span class="number">0</span>;k<Len;k++) {</span><br><span class="line"> i=(i+<span class="number">1</span>)%<span class="number">256</span>;</span><br><span class="line"> j=(j+s[i])%<span class="number">256</span>;</span><br><span class="line"> tmp = s[i];</span><br><span class="line"> s[i] = s[j]; <span class="comment">//交换s[x]和s[y]</span></span><br><span class="line"> s[j] = tmp;</span><br><span class="line"> t=(s[i]+s[j])%<span class="number">256</span>;</span><br><span class="line"> Data[k] ^= s[t];</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{ </span><br><span class="line"> <span class="keyword">unsigned</span> <span class="keyword">char</span> s[<span class="number">256</span>] = {<span class="number">0</span>}; <span class="comment">//S-box</span></span><br><span class="line"> <span class="keyword">char</span> key[<span class="number">256</span>] = <span class="string">"ITEF6588"</span>;</span><br><span class="line"> <span class="keyword">char</span> pData[<span class="number">512</span>] = {<span class="number">232</span>, <span class="number">48</span>, <span class="number">232</span>, <span class="number">48</span>, <span class="number">201</span>, <span class="number">101</span>, <span class="number">169</span>, <span class="number">186</span>, <span class="number">119</span>, <span class="number">218</span>, <span class="number">244</span>, <span class="number">78</span>, <span class="number">227</span>, <span class="number">233</span>, <span class="number">96</span>, <span class="number">118</span>, <span class="number">193</span>};</span><br><span class="line"> ULONG len = <span class="built_in">strlen</span>(pData);</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"key : %s\n"</span>, key);</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"raw : %s\n"</span>, pData);</span><br><span class="line"> rc4_init(s,(<span class="keyword">unsigned</span> <span class="keyword">char</span> *)key, <span class="built_in">strlen</span>(key)); <span class="comment">//初始化密钥</span></span><br><span class="line"> rc4_crypt(s,(<span class="keyword">unsigned</span> <span class="keyword">char</span> *)pData,len);<span class="comment">//解密</span></span><br><span class="line"> <span class="comment">//printf("decrypt : %s\n",pData);</span></span><br><span class="line"> <span class="keyword">char</span> key2[<span class="number">8</span>] = <span class="string">"ISCC2021"</span>;</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"key2 : %s\n"</span>,key2);</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> k=<span class="number">0</span>;k<<span class="number">17</span>;k++)</span><br><span class="line"> {</span><br><span class="line"> pData[k] +=key2[(<span class="keyword">int</span>)k%<span class="number">8</span>];</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">for</span>(<span class="keyword">int</span> j=<span class="number">0</span>;j<<span class="number">17</span>;j++)</span><br><span class="line"> {</span><br><span class="line"> --pData[j];</span><br><span class="line"> }</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"%s\n"</span>,pData);</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>得到flag</p>
<p> <img src="https://i.loli.net/2021/05/26/NzEnRPHDQT6sq3l.png"></p>
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<p>REVERSE—glass</p>
<ol>
<li><p>下载附件得到glass.apk</p>
<p><img src="https://i.loli.net/2021/05/20/grqKToF9ymcIRzv.png"></p>
</li>
<li><p>尝试使用dex2jar将glass.apk转化为jar文件</p>
<ol>
<li><p>将文件修改为zip文件：</p>
<p><img src="https://i.loli.net/2021/05/20/pl1PiXL5sHmDgh2.png"></p>
</li>
<li><p>将解压后文件中的classes.dex文件转换为jar文件：</p>
<p><img src="https://i.loli.net/2021/05/20/k1jEdthq6N5QBWR.png"></p>
<p><img src="https://i.loli.net/2021/05/20/gEw3mdAnUHLGicC.png"></p>
</li>
<li><p>把生成的classes-dex2jar.jar 拷入解压目录：</p>
<p><img src="https://i.loli.net/2021/05/20/tHxZuF79zCaibQT.png"></p>
</li>
</ol>
</li>
<li><p>使用jd_gui工具查看jar文件</p>
<p><img src="https://i.loli.net/2021/05/20/QsBe9ANDTugoh62.png"></p>
<p>可以看出，源文件是通过调用相关函数判断输入的flag是否真确。</p>
</li>
<li><p>查看so文件</p>
<p><img src="https://i.loli.net/2021/05/20/lZYF2GpnMxePLfu.png"></p>
<p><img src="https://i.loli.net/2021/05/20/m8CnMZW4bFQh2VA.png"></p>
<ol>
<li> 一层层对主函数进行分析：</li>
</ol>
<p> 定位到memcmp(v3,&unk_467C,39u) == 0</p>
<p> <img src="https://i.loli.net/2021/05/20/e4aDSQ6pZxo8jsA.png">]</p>
<ol start="2">
<li><p>分析sub_10D4函数：</p>
<p><img src="https://i.loli.net/2021/05/20/qoSk9eZBO6VlHut.png"></p>
</li>
<li><p>分析sub_FFC和sub_1088：</p>
<p><img src="https://i.loli.net/2021/05/20/7ulABmwpJOgRCz8.png"></p>
<p><img src="https://i.loli.net/2021/05/20/Lvwu6l7tdHI4zsT.png"></p>
<p>可以看出这两个是对输入的字符串进行RC4加密。</p>
</li>
</ol>
</li>
<li><p>构造逆向脚本：</p>
<ol>
<li><p>进行函数逆向+base64解密：</p>
<p><img src="https://i.loli.net/2021/05/20/uJOi32dxrAc4fLQ.png"></p>
<p>得到加密后的字符串：</p>
<img src="https://i.loli.net/2021/05/20/kyhqwtdIWDrJxOs.png" style="zoom:150%;"></li>
<li><p>进行RC4解密：</p>
<p><img src="https://i.loli.net/2021/05/20/QsNJvbYFU7598oe.png"></p>
<p> (安装pycryptodome库)</p>
<p>编写加密解密脚本:</p>
<p><img src="https://i.loli.net/2021/05/20/DJi3T4e9g6KjXC1.png"></p>
<p>得到flag:</p>
<img src="https://i.loli.net/2021/05/20/tyuNz5aTPUsk6QM.png" style="zoom:150%;"></li>
</ol>
</li>
</ol>
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