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<meta property="og:description" content="软件保护方式 功能限制 时间限制 运行时长限制 使用日期限制 使用次数限制 警告窗口 分析工具 静态分析工具 IDA W32Dasm lordPE Resource Hacker 动态分析工具 OllyDbg WinDbg 对抗分析技术 反静态分析技术 花指令 自修改代码技术 多态技术 变形技术 虚拟机保护技术 反动态分析技术 检测调试状态 检测用户态调试器">
<meta property="og:locale" content="zh-Hans">
<meta property="og:image" content="https://res.cloudinary.com/dozyfkbg3/image/upload/v1553759246/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E5%9B%BE%E7%89%871.png">
<meta property="og:updated_time" content="2019-03-28T07:54:18.434Z">
<meta property="og:image" content="https://res.cloudinary.com/dozyfkbg3/image/upload/v1553772615/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B71.png">
<meta property="og:image" content="https://res.cloudinary.com/dozyfkbg3/image/upload/v1553773066/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B72.png">
<meta property="og:updated_time" content="2019-03-28T12:37:51.266Z">
<meta name="twitter:card" content="summary">
<meta name="twitter:title" content="逆向工程实验">
<meta name="twitter:description" content="软件保护方式 功能限制 时间限制 运行时长限制 使用日期限制 使用次数限制 警告窗口 分析工具 静态分析工具 IDA W32Dasm lordPE Resource Hacker 动态分析工具 OllyDbg WinDbg 对抗分析技术 反静态分析技术 花指令 自修改代码技术 多态技术 变形技术 虚拟机保护技术 反动态分析技术 检测调试状态 检测用户态调试器">
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</span>
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1 分钟
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<li>使调试器窗口不可用</li>
<li>终止调试器进程</li>
</ul>
<h1 id="PE文件格式基础"><a href="#PE文件格式基础" class="headerlink" title="PE文件格式基础"></a>PE文件格式基础</h1><h1 id="实验1：软件破解"><a href="#实验1：软件破解" class="headerlink" title="实验1：软件破解"></a>实验1：软件破解</h1><h2 id="对象"><a href="#对象" class="headerlink" title="对象"></a>对象</h2><p><a href="https://res.cloudinary.com/dozyfkbg3/raw/upload/v1553761280/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/crack.exe1" target="_blank" rel="noopener">crack.exe</a>，28.0 KB</p>
<ul>
<li>无保护措施：无壳、未加密、无反调试措施</li>
<li>用户名至少要5个字节</li>
<li>输入错误验证码时输出：“Bad Boy!”</li>
</ul>
<h2 id="爆破"><a href="#爆破" class="headerlink" title="爆破"></a>爆破</h2><ol>
<li><p>查找显示注册结果相关代码<br>当输入错误验证码时，程序会输出“Bad Boy”，因此我们将程序拖入IDA，以流程图显示函数内部的跳转。查找“Bad Boy”字符串，我们可以定位到显示注册结果的相关代码：<br><img src="https://res.cloudinary.com/dozyfkbg3/image/upload/v1553772615/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B71.png" alt></p>
</li>
<li><p>查找注册码验证相关代码<br>用鼠标选中程序分支点，按空格切换回汇编指令界面<br><img src="https://res.cloudinary.com/dozyfkbg3/image/upload/v1553773066/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B72.png" alt></p>
</li>
</ol>
<p>可以看到，这条指令位于PE文件的.text节，并且IDA已经自动将地址转换为运行时的内存地址VA:<figure class="highlight plain"><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">3. 修改程序跳转</span><br><span class="line">现在关闭IDA，换用OllyDbg进行动态调试来看看程序时如何分支跳转的</span><br><span class="line">```Ctrl+G``` 直接跳到由IDA得到的VA:```004010F9```处查看那条引起程序分支的关键指令</span><br><span class="line">选中这条指令，按F2设置断点，再按F9运行程序，这时候控制权会回到程序，OllyDbg暂时挂起。到程序提示输入名字和序列号，随意输入（名字大于五个字节），点击ok后，OllyDbg会重新中断程序，收回控制权，如图：</span><br><span class="line">![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1553775053/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B74.png)</span><br><span class="line">验证函数的返回值存于EAX寄存器中，if语句通过以下两条指令执行</span><br></pre></td></tr></table></figure></p>
<p>cmp eax,ecx<br>jnz xxxxxxx<br><figure class="highlight plain"><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></pre></td><td class="code"><pre><span class="line">也就是说，当序列号输入错误时，EAX中的值为0，跳转将被执行。</span><br><span class="line">如果我们把jnz这条指令修改为jz，那么整个程序的逻辑就会反过来。</span><br><span class="line">双击jnz这条指令，将其改为jz，单击&quot;汇编&quot;将其写入内存</span><br><span class="line">![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1553775817/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B75.png)</span><br><span class="line">可以看到此时程序执行了相反的路径</span><br><span class="line"></span><br><span class="line">上面只是在内存中修改程序，我们还需要在二进制文件中也修改相应的字节，这里考察VA与文件地址之间的关系</span><br><span class="line">用LordPE打开.exe文件，查看PE文件的节信息</span><br><span class="line">![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1553776239/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B76.png)</span><br><span class="line">VA:```004010F9</span><br></pre></td></tr></table></figure></p>
<p>根据VA与文件地址的换算公式：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">文件偏移地址 = VA - Image Base - 节偏移</span><br><span class="line"> = 0x004010F9 - 0x00400000 - 0</span><br><span class="line"> = 0x10F9</span><br></pre></td></tr></table></figure></p>
<p>也就是说，这条指令在PE文件中位于10F9字节处，使用010Editer打开crack.exe，将这一字节的75(JNZ)改为74(JZ)，保存后重新执行，破解成功！</p>
<h2 id="编写注册机"><a href="#编写注册机" class="headerlink" title="编写注册机"></a>编写注册机</h2><ol>
<li>查找显示注册结果相关代码</li>
<li>查找注册码验证相关代码</li>
<li>根据注册码验证代码编写注册机</li>
</ol>
</div>
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<div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#软件保护方式"><span class="nav-number">1.</span> <span class="nav-text">软件保护方式</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#分析工具"><span class="nav-number">2.</span> <span class="nav-text">分析工具</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#对抗分析技术"><span class="nav-number">3.</span> <span class="nav-text">对抗分析技术</span></a></li></ol></div>
<div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#软件保护方式"><span class="nav-number">1.</span> <span class="nav-text">软件保护方式</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#分析工具"><span class="nav-number">2.</span> <span class="nav-text">分析工具</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#对抗分析技术"><span class="nav-number">3.</span> <span class="nav-text">对抗分析技术</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#PE文件格式基础"><span class="nav-number">4.</span> <span class="nav-text">PE文件格式基础</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#实验1：软件破解"><span class="nav-number">5.</span> <span class="nav-text">实验1：软件破解</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#对象"><span class="nav-number">5.1.</span> <span class="nav-text">对象</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#爆破"><span class="nav-number">5.2.</span> <span class="nav-text">爆破</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#编写注册机"><span class="nav-number">5.3.</span> <span class="nav-text">编写注册机</span></a></li></ol></li></ol></div>
</div>
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<lastmod>2019-03-28</lastmod>
</url> <url>
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<lastmod>2019-03-28</lastmod>
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<title><![CDATA[逆向工程实验]]></title>
<url>%2F2019%2F03%2F28%2F%E9%80%86%E5%90%91%E5%B7%A5%E7%A8%8B%E5%AE%9E%E9%AA%8C%2F</url>
<content type="text"><![CDATA[软件保护方式 功能限制 时间限制 运行时长限制 使用日期限制 使用次数限制 警告窗口 分析工具 静态分析工具 IDA W32Dasm lordPE Resource Hacker 动态分析工具 OllyDbg WinDbg 对抗分析技术 反静态分析技术 花指令 自修改代码技术 多态技术 变形技术 虚拟机保护技术 反动态分析技术 检测调试状态 检测用户态调试器 检测内核态调试器 其他方法：父进程检测；StartupInfo 结构；时间差；通过Trap Flag检测 发现调试器后的处理 程序自身退出 向调试器窗口发送消息使调试器退出 使调试器窗口不可用 终止调试器进程]]></content>
<content type="text"><![CDATA[软件保护方式 功能限制 时间限制 运行时长限制 使用日期限制 使用次数限制 警告窗口 分析工具 静态分析工具 IDA W32Dasm lordPE Resource Hacker 动态分析工具 OllyDbg WinDbg 对抗分析技术 反静态分析技术 花指令 自修改代码技术 多态技术 变形技术 虚拟机保护技术 反动态分析技术 检测调试状态 检测用户态调试器 检测内核态调试器 其他方法：父进程检测；StartupInfo 结构；时间差；通过Trap Flag检测 发现调试器后的处理 程序自身退出 向调试器窗口发送消息使调试器退出 使调试器窗口不可用 终止调试器进程 PE文件格式基础实验1：软件破解对象crack.exe，28.0 KB 无保护措施：无壳、未加密、无反调试措施 用户名至少要5个字节 输入错误验证码时输出：“Bad Boy!” 爆破 查找显示注册结果相关代码当输入错误验证码时，程序会输出“Bad Boy”，因此我们将程序拖入IDA，以流程图显示函数内部的跳转。查找“Bad Boy”字符串，我们可以定位到显示注册结果的相关代码： 查找注册码验证相关代码用鼠标选中程序分支点，按空格切换回汇编指令界面 可以看到，这条指令位于PE文件的.text节，并且IDA已经自动将地址转换为运行时的内存地址VA:1234563. 修改程序跳转现在关闭IDA，换用OllyDbg进行动态调试来看看程序时如何分支跳转的```Ctrl+G``` 直接跳到由IDA得到的VA:```004010F9```处查看那条引起程序分支的关键指令选中这条指令，按F2设置断点，再按F9运行程序，这时候控制权会回到程序，OllyDbg暂时挂起。到程序提示输入名字和序列号，随意输入（名字大于五个字节），点击ok后，OllyDbg会重新中断程序，收回控制权，如图：![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1553775053/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B74.png)验证函数的返回值存于EAX寄存器中，if语句通过以下两条指令执行 cmp eax,ecxjnz xxxxxxx12345678910也就是说，当序列号输入错误时，EAX中的值为0，跳转将被执行。如果我们把jnz这条指令修改为jz，那么整个程序的逻辑就会反过来。双击jnz这条指令，将其改为jz，单击&quot;汇编&quot;将其写入内存![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1553775817/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B75.png)可以看到此时程序执行了相反的路径上面只是在内存中修改程序，我们还需要在二进制文件中也修改相应的字节，这里考察VA与文件地址之间的关系用LordPE打开.exe文件，查看PE文件的节信息![](https://res.cloudinary.com/dozyfkbg3/image/upload/v1553776239/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B76.png)VA:```004010F9 根据VA与文件地址的换算公式：123文件偏移地址 = VA - Image Base - 节偏移 = 0x004010F9 - 0x00400000 - 0 = 0x10F9 也就是说，这条指令在PE文件中位于10F9字节处，使用010Editer打开crack.exe，将这一字节的75(JNZ)改为74(JZ)，保存后重新执行，破解成功！ 编写注册机 查找显示注册结果相关代码 查找注册码验证相关代码 根据注册码验证代码编写注册机]]></content>
<categories>
<category>-二进制</category>
</categories>

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