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3.1k 字
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11 分钟
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一些逆向的小实验
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< / div >
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< div class = "post-body" itemprop = "articleBody" >
< h1 id = "软件保护方式" > < a href = "#软件保护方式" class = "headerlink" title = "软件保护方式" > < / a > 软件保护方式< / h1 > < ol >
< li > 功能限制< / li >
< li > 时间限制< / li >
< / ol >
< ul >
< li > 运行时长限制< / li >
< li > 使用日期限制< / li >
< li > 使用次数限制< / li >
< / ul >
< ol start = "3" >
< li > 警告窗口< / li >
< / ol >
< h2 id > < a href = "#" class = "headerlink" title > < / a > < img src = "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" alt > < / h2 > < h1 id = "分析工具" > < a href = "#分析工具" class = "headerlink" title = "分析工具" > < / a > 分析工具< / h1 > < ol >
< li > 静态分析工具< / li >
< / ol >
< ul >
< li > IDA< / li >
< li > W32Dasm< / li >
< li > lordPE< / li >
< li > Resource Hacker< / li >
< / ul >
< ol start = "2" >
< li > 动态分析工具< / li >
< / ol >
< ul >
< li > OllyDbg< / li >
< li > WinDbg< / li >
< / ul >
< hr >
< h1 id = "对抗分析技术" > < a href = "#对抗分析技术" class = "headerlink" title = "对抗分析技术" > < / a > 对抗分析技术< / h1 > < ol >
< li > 反静态分析技术< / li >
< / ol >
< ul >
< li > 花指令< / li >
< li > 自修改代码技术< / li >
< li > 多态技术< / li >
< li > 变形技术< / li >
< li > 虚拟机保护技术< / li >
< / ul >
< ol start = "2" >
< li > 反动态分析技术< / li >
< / ol >
< ul >
< li > 检测调试状态< / li >
< li > 检测用户态调试器< / li >
< li > 检测内核态调试器< / li >
< li > 其他方法： ； ； ； < / li >
< / ul >
< ol start = "3" >
< li > 发现调试器后的处理< / li >
< / ol >
< ul >
< li > 程序自身退出< / li >
< li > 向调试器窗口发送消息使调试器退出< / li >
< li > 使调试器窗口不可用< / li >
< li > 终止调试器进程< / li >
< / ul >
< hr >
< 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 > < hr >
< h1 id = "加壳脱壳" > < a href = "#加壳脱壳" class = "headerlink" title = "加壳脱壳" > < / a > 加壳脱壳< / h1 > < hr >
< h1 id = "反调试技术" > < a href = "#反调试技术" class = "headerlink" title = "反调试技术" > < / a > 反调试技术< / h1 > < p > 反调试技术，程序用它来识别是否被调试，或者让调试器失效。为了阻止调试器的分析，当程序意识到自己被调试时，它们可能改变正常的执行路径或者修改自身程序让自己崩溃，从而增加调试时间和复杂度。< / p >
< h2 id = "探测windows调试器" > < a href = "#探测windows调试器" class = "headerlink" title = "探测windows调试器" > < / a > 探测windows调试器< / h2 > < ol >
< li > 使用windows API< br > 使用Windows API函数探测调试器是否存在是最简单的反调试技术。< br > 通常， ， ， ， ， < br > 常用来探测调试器的API函数有： < code > IsDebuggerPresent< / code > < code > CheckRemoteDebuggerPresent< / code > < code > NtQueryInformationProcess< / code > < code > OutputDebuggString< / code > < / li >
< li > 手动检测数据结构< br > 程序编写者经常手动执行与这些API功能相同的操作< / li >
< / ol >
< ul >
< li > 检查BeingDebugged属性< / li >
< li > 检测ProcessHeap属性< / li >
< li > 检测NTGlobalFlag< / li >
< / ul >
< ol start = "3" >
< li > 系统痕迹检测< br > 通常， ， ， ， ， ， ， ， < / li >
< / ol >
< h2 id = "识别调试器的行为" > < a href = "#识别调试器的行为" class = "headerlink" title = "识别调试器的行为" > < / a > 识别调试器的行为< / h2 > < p > 在逆向工程中， ， ， < / p >
< ol >
< li > INT扫描< br > 调试器设置断点的基本机制是用软件中断INT 3， ， < / li >
< li > 执行代码校验和检查< br > 与INT扫描目的相同， < / li >
< li > 时钟检测< br > 被调试时，进程的运行速度大大降低，常用指令有：< code > rdstc< / code > < code > QueryPerformanceCounter< / code > < code > GetTickCount< / code > ,有如下两种方式探测时钟：< / li >
< / ol >
< ul >
< li > 记录执行一段操作前后的时间戳< / li >
< li > 记录触发一个异常前后的时间戳< h2 id = "干扰调试器的功能" > < a href = "#干扰调试器的功能" class = "headerlink" title = "干扰调试器的功能" > < / a > 干扰调试器的功能< / h2 > 本地存储(TLS)回调： ， < br > 使用异常： ， ， ， < br > 插入中断： < h2 id = "调试器漏洞" > < a href = "#调试器漏洞" class = "headerlink" title = "调试器漏洞" > < / a > 调试器漏洞< / h2 > PE头漏洞、OutputDebugString漏洞< / li >
< / ul >
< hr >
< h1 id = "实验一：软件破解" > < a href = "#实验一：软件破解" class = "headerlink" title = "实验一：软件破解" > < / a > 实验一：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 > ， < / 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： < / li >
< / ul >
< h2 id = "爆破" > < a href = "#爆破" class = "headerlink" title = "爆破" > < / a > 爆破< / h2 > < h3 id = "查找显示注册结果相关代码" > < a href = "#查找显示注册结果相关代码" class = "headerlink" title = "查找显示注册结果相关代码" > < / a > 查找显示注册结果相关代码< / h3 > < p > 当输入错误验证码时， ， ， ， ： < 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 >
< h3 id = "查找注册码验证相关代码" > < a href = "#查找注册码验证相关代码" class = "headerlink" title = "查找注册码验证相关代码" > < / a > 查找注册码验证相关代码< / h3 > < p > 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 >
< p > 可以看到， ， < code > VA:004010F9< / code > < / p >
< h3 id = "修改程序跳转" > < a href = "#修改程序跳转" class = "headerlink" title = "修改程序跳转" > < / a > 修改程序跳转< / h3 > < ul >
< li > 现在关闭IDA， < code > Ctrl+G< / code > 直接跳到由IDA得到的< code > VA:004010F9< / code > 处查看那条引起程序分支的关键指令< / li >
< li > 选中这条指令， ， ， ， ， （ ） ， ， ， ， ： < br > < img src = "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" alt > < / li >
< li > < p > 验证函数的返回值存于EAX寄存器中， < / p >
2019-07-16 09:15:34 +00:00
< figure class = "highlight plain" > < table > < tr > < td class = "gutter" > < pre > < span class = "line" > 1< / span > < br > < span class = "line" > 2< / span > < br > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > cmp eax,ecx< / span > < br > < span class = "line" > jnz xxxxxxx< / span > < br > < / pre > < / td > < / tr > < / table > < / figure >
2019-04-15 07:42:42 +00:00
< / li >
< li > < p > 也就是说， ， ， < br > 如果我们把< code > jnz< / code > 这条指令修改为< code > jz< / code > ，那么整个程序的逻辑就会反过来。< br > 双击< code > jnz< / code > 这条指令，将其改为< code > jz< / code > ，单击”汇编”将其写入内存< br > < img src = "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" alt > < br > 可以看到此时程序执行了相反的路径< / p >
< / li >
< li > < p > 上面只是在内存中修改程序， ， < / p >
< / li >
2019-07-16 09:15:34 +00:00
< li > 用LordPE打开.exe文件， < br > < img src = "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" alt > < br > 根据VA与文件地址的换算公式： < 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 >
2019-04-15 07:42:42 +00:00
< / li >
< / ul >
< p > 也就是说， < code > 10F9< / code > 字节处， ， < code > 75(JNZ)`< / code > 改为< code > 74(JZ)`< / code > ，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 > < h3 id = "查找显示注册结果相关代码-1" > < a href = "#查找显示注册结果相关代码-1" class = "headerlink" title = "查找显示注册结果相关代码" > < / a > 查找显示注册结果相关代码< / h3 > < p > 通过查找字符串“good boy”等， < / p >
< h3 id = "查找注册码验证相关代码-1" > < a href = "#查找注册码验证相关代码-1" class = "headerlink" title = "查找注册码验证相关代码" > < / a > 查找注册码验证相关代码< / h3 > < p > 因为检测密钥是否正确时会将结果返回到EAX寄存器中， ， ， < br > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1553858953/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B77.png" alt > < / p >
2019-07-16 09:15:34 +00:00
< h3 id = "根据注册码验证代码编写注册机" > < a href = "#根据注册码验证代码编写注册机" class = "headerlink" title = "根据注册码验证代码编写注册机" > < / a > 根据注册码验证代码编写注册机< / h3 > < p > 分析上图算法， < 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 > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > for ( i = 0; i < v6; v12 = v10 )< / span > < br > < span class = "line" > v10 = (v6 + v12) * lpStringa[i++];< / span > < br > < span class = "line" > if ( (v12 ^ 0xA9F9FA) == atoi(v15) )< / span > < br > < span class = "line" > MessageBoxA(hDlg, aTerimaKasihKer, aGoodBoy, 0);< / span > < br > < / pre > < / td > < / tr > < / table > < / figure > < / p >
< p > 可以看出， ， ， < br > 所以，只要能弄明白< code > v6， ， ， < / code > 的含义，我们就可以轻松的编写注册机。< br > 打开ollybdg， ， < 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 > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > 004010CC |> /8B4D 10 |mov ecx,[arg.3] //此时ecx为name< / span > < br > < span class = "line" > 004010CF |. 8B55 0C |mov edx,[arg.2] //edx为0x1908< / span > < br > < span class = "line" > 004010D2 |. 03D3 |add edx,ebx //edx加上name的长度（ ） < / span > < br > < span class = "line" > 004010D4 |. 0FBE0C08 |movsx ecx,byte ptr ds:[eax+ecx] //ecx=61h< / span > < br > < span class = "line" > 004010D8 |. 0FAFCA |imul ecx,edx //61h(a) * edx< / span > < br > < span class = "line" > 004010DB |. 40 |inc eax //eax加1（ ） < / span > < br > < span class = "line" > 004010DC |. 894D 0C |mov [arg.2],ecx< / span > < br > < span class = "line" > 004010DF |. 3BC3 |cmp eax,ebx //循环是否结束< / span > < br > < / pre > < / td > < / tr > < / table > < / figure > < / p >
< p > < code > arg.3< / code > 为输入的< code > name< / code > ， < code > arg.2< / code > 初始为< code > 0x1908< / code > ， < code > ebx< / code > 为< code > name< / code > 的长度，< code > eax< / code > 每次循环加1直到等于长度< br > 因此，我们可以对参数的含义进行解释如下< 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 > < span class = "line" > 11< / span > < br > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > v12 = 6408; //0x1908< / span > < br > < span class = "line" > v10 = 6408; //0x1908< / span > < br > < span class = "line" > v6 = len(name);< / span > < br > < span class = "line" > v12 = input_serial;< / span > < br > < span class = "line" > for ( i = 0; i < v6; i++ ){ < / span > < br > < span class = "line" > v12 = v10； < / span > < br > < span class = "line" > v10 = (v6 + v12) * lpStringa[i];< / span > < br > < span class = "line" > } < / span > < br > < span class = "line" > if ((v12 ^ 0xA9F9FA) == atoi(v15)){ < / span > < br > < span class = "line" > MessageBoxA(hDlg, aTerimaKasihKer, aGoodBoy, 0);< / span > < br > < span class = "line" > } < / span > < br > < / pre > < / td > < / tr > < / table > < / figure > < / p >
< p > 可见，< code > v12^0xA9F9FA< / code > 的结果即是正确的注册码，我们编写一个< a href = "https://res.cloudinary.com/dozyfkbg3/raw/upload/v1553937750/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/reg.cpp" target = "_blank" rel = "noopener" > 简单的程序< / a > 帮助我们生成注册码：< 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 > < 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 > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > #include < iostream> < / span > < br > < span class = "line" > #include< stdio.h> < / span > < br > < span class = "line" > < / span > < br > < span class = "line" > using namespace::std;< / span > < br > < span class = "line" > int main(){ < / span > < br > < span class = "line" > int v12;< / span > < br > < span class = "line" > int v10 = 6408; //0x1908< / span > < br > < span class = "line" > string name;< / span > < br > < span class = "line" > cout < < " 请输入name: " ;< / span > < br > < span class = "line" > cin > > name;< / span > < br > < span class = "line" > int len = name.size();< / span > < br > < span class = "line" > for(int i = 0; i < len+1; i++ ){ < / span > < br > < span class = "line" > v12 = v10;< / span > < br > < span class = "line" > v10 = (len + v12) * name[i];< / span > < br > < span class = "line" > } < / span > < br > < span class = "line" > cout< < " \n" < < " 注册码为: " < < (v12 ^ 0xA9F9FA)< < endl;< / span > < br > < span class = "line" > return 0;< / span > < br > < span class = "line" > } < / span > < br > < / pre > < / td > < / tr > < / table > < / figure > < / p >
2019-04-15 07:42:42 +00:00
< p > 计算出”testname”的对应注册码< br > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1553937461/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B79.png" alt > < br > 注册成功！< / p >
< h2 id = "-1" > < a href = "#-1" class = "headerlink" title > < / a > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1553937531/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/%E6%8D%95%E8%8E%B711.png" alt > < / h2 > < h1 id = "实验二：软件反动态调试技术分析" > < a href = "#实验二：软件反动态调试技术分析" class = "headerlink" title = "实验二：软件反动态调试技术分析" > < / a > 实验二：软件反动态调试技术分析< / h1 > < h2 id = "对象-1" > < a href = "#对象-1" class = "headerlink" title = "对象" > < / a > 对象< / h2 > < p > < a href = "https://res.cloudinary.com/dozyfkbg3/raw/upload/v1553779243/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/CrackMe1.exe1" target = "_blank" rel = "noopener" > CrackMe1.exe< / a > 1641.0 KB< br > 无保护措施：无壳、未加密、无反调试措施< br > 使用OllyDbg对该程序进行调试时， < / p >
< h2 id = "要求" > < a href = "#要求" class = "headerlink" title = "要求" > < / a > 要求< / h2 > < ol >
< li > 分析CrackMe1.exe是如何通过父进程检测实现反OllyDbg调试的< / li >
< li > 分析除父进程检测外，该程序用到的反动态调试技术< / li >
< / ol >
2019-05-07 11:35:07 +00:00
< h2 id = "父进程检测" > < a href = "#父进程检测" class = "headerlink" title = "父进程检测" > < / a > 父进程检测< / h2 > < p > 一般双击运行的进程的父进程都是explorer.exe， < / p >
2019-07-16 09:15:34 +00:00
< 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 > < 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 > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > BOOL IsInDebugger(){ < / span > < br > < span class = "line" > HANDLE hProcessSnap = NULL;< / span > < br > < span class = "line" > char Expchar[] =" \\EXPLORER.EXE" ;< / span > < br > < span class = "line" > char szBuffer[MAX_PATH]={ 0} ;< / span > < br > < span class = "line" > char FileName[MAX_PATH]={ 0} ;< / span > < br > < span class = "line" > PROCESSENTRY32 pe32 = { 0} ;< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > hProcessSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0); //得到所有进程的列表快照< / span > < br > < span class = "line" > if (hProcessSnap == INVALID_HANDLE_VALUE)< / span > < br > < span class = "line" > return FALSE; < / span > < br > < span class = "line" > < / span > < br > < span class = "line" > pe32.dwSize = sizeof(PROCESSENTRY32);< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > if (!Process32First(hProcessSnap, & pe32)) // 查找进程< / span > < br > < span class = "line" > { < / span > < br > < span class = "line" > CloseHandle (hProcessSnap);< / span > < br > < span class = "line" > return FALSE;< / span > < br > < span class = "line" > } < / span > < br > < span class = "line" > < / span > < br > < span class = "line" > do // 遍历所有进程< / span > < br > < span class = "line" > { < / span > < br > < span class = "line" > if(pe32.th32ProcessID==GetCurrentProcessId() )//判断是否是自己的进程？< / span > < br > < span class = "line" > { < / span > < br > < span class = "line" > HANDLE hProcess = OpenProcess (PROCESS_ALL_ACCESS, FALSE, pe32.th32ParentProcessID); //打开父进程< / span > < br > < span class = "line" > if (hProcess)< / span > < br > < span class = "line" > { < / span > < br > < span class = "line" > if (GetModuleFileNameEx(hProcess, NULL, FileName, MAX_PATH) ) // 得到父进程名< / span > < br > < span class = "line" > { < / span > < br > < span class = "line" > GetWindowsDirectory(szBuffer,MAX_PATH); //得到系统所在目录< / span > < br > < span class = "line" > strcat(szBuffer,Expchar); //组合成类似的字串D:\Winnt\Explorer.EXE< / span > < br > < span class = "line" > if(strcmpi (FileName,szBuffer)) // 比较当前是否为Explorer.EXE进程< / span > < br > < span class = "line" > { < / span > < br > < span class = "line" > return TRUE; // 父进程若不是Explorer.EXE， < / span > < br > < span class = "line" >
< p > 由上述示例代码， < br > 因此在Ollydbg中首先找到GetCurrentProcessId模块（ ） ， < br > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1557128745/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/1.png" alt > < br > 查看断点是否设置成功< br > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1557128848/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/2.png" alt > < br > 运行该程序,在断点00401932停下， ， < br > 程序在调用完GetCurrentProcessId后， ， < br > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1557129711/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/3.png" alt > < br > 然后调用Openprocess函数， ， （ ） < br > 通过ntdll.dll中的LoadLibraryA和GetProcAddress函数找到NtQueryInformationProcess:< br > < figure class = "highlight plain" > < table > < tr > < td class = "gutter" > < pre > < span class = "line" > 1< / span > < br > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > PNTQUERYINFORMATIONPROCESS NtQueryInformationProcess = (PNTQUERYINFORMATIONPROCESS)GetProcAddress(GetModuleHandleA(" ntdll" )," NtQueryInformationProcess" );< / span > < br > < / pre > < / td > < / tr > < / table > < / figure > < / p >
2019-05-07 11:32:10 +00:00
< p > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1557131510/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/4.png" alt > < br > 用OpenProcess获得的句柄设置NtQueryInformationProcess的对应参数， ， < br > 然后再次调用openprocess获得父进程的句柄< br > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1557132091/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/5.png" alt > < br > 最后， ： < br > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1557133154/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/6.png" alt > < br > 至此， ， < br > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1557133828/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/7.png" alt > < br > EDX中保存explorer字符串， < br > 然后进入循环逐位比较， ， ， ， ， ， ； ， ， ， ， < / p >
< h2 id = "其他检测" > < a href = "#其他检测" class = "headerlink" title = "其他检测" > < / a > 其他检测< / h2 > < p > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1557227067/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/8.png" alt > < br > 用EnumWindows枚举所有屏幕上的顶层窗口， ， （ ） < br > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1557227506/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/9.png" alt > < br > 将得到的窗口标题与”ollydbg”等进行比较， < / p >
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< h1 id = "实验三：加花加密反调试技术分析" > < a href = "#实验三：加花加密反调试技术分析" class = "headerlink" title = "实验三：加花加密反调试技术分析" > < / a > 实验三：加花加密反调试技术分析< / h1 > < h2 id = "对象-2" > < a href = "#对象-2" class = "headerlink" title = "对象" > < / a > 对象< / h2 > < p > < a href = "https://res.cloudinary.com/dozyfkbg3/raw/upload/v1553779413/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/CrackMe2.exe1" target = "_blank" rel = "noopener" > CrackMe2.exe< / a > 9.00 KB< br > 保护措施：部分加花、部分加密、简单反调试< br > 根据< a href = "https://res.cloudinary.com/dozyfkbg3/raw/upload/v1553779403/%E8%BD%AF%E4%BB%B6%E7%A0%B4%E8%A7%A3/Crackme2%E6%8F%90%E7%A4%BA.docx" target = "_blank" rel = "noopener" > 提示< / a > < / p >
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<!-- LOCAL: You can save these files to your site and update links -->
< link rel = "stylesheet" href = "https://unpkg.com/gitalk/dist/gitalk.css" >
< script src = "https://unpkg.com/gitalk/dist/gitalk.min.js" > < / script >
<!-- END LOCAL -->
< script type = "text/javascript" >
function renderGitalk(){
var gitalk = new Gitalk({
owner: 'Cool-Y',
repo: 'gitment-comments',
clientID: '180955a2c3ae3d966d9a',
clientSecret: '1c5db4da72df5e6fc318d12afe5f4406f7c54343',
admin: 'Cool-Y',
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id: decodeURI(location.pathname),
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distractionFreeMode: 'true'
});
gitalk.render('gitalk-container');
}
renderGitalk();
< / script >
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< script src = "https://cdn1.lncld.net/static/js/av-core-mini-0.6.4.js" > < / script >
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< script > AV . initialize ( "CnxMogaLcXQrm9Q03lF8XH7j-gzGzoHsz" , "EHqNuJ6AYvuHnY6bN6w2SMXl" ) ; < / script >
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< script >
function showTime(Counter) {
var query = new AV.Query(Counter);
var entries = [];
var $visitors = $(".leancloud_visitors");
$visitors.each(function () {
entries.push( $(this).attr("id").trim() );
});
query.containedIn('url', entries);
query.find()
.done(function (results) {
var COUNT_CONTAINER_REF = '.leancloud-visitors-count';
if (results.length === 0) {
$visitors.find(COUNT_CONTAINER_REF).text(0);
return;
}
for (var i = 0; i < results.length ; i + + ) {
var item = results[i];
var url = item.get('url');
var time = item.get('time');
var element = document.getElementById(url);
$(element).find(COUNT_CONTAINER_REF).text(time);
}
for(var i = 0; i < entries.length ; i + + ) {
var url = entries[i];
var element = document.getElementById(url);
var countSpan = $(element).find(COUNT_CONTAINER_REF);
if( countSpan.text() == '') {
countSpan.text(0);
}
}
})
.fail(function (object, error) {
console.log("Error: " + error.code + " " + error.message);
});
}
function addCount(Counter) {
var $visitors = $(".leancloud_visitors");
var url = $visitors.attr('id').trim();
var title = $visitors.attr('data-flag-title').trim();
var query = new AV.Query(Counter);
query.equalTo("url", url);
query.find({
success: function(results) {
if (results.length > 0) {
var counter = results[0];
counter.fetchWhenSave(true);
counter.increment("time");
counter.save(null, {
success: function(counter) {
var $element = $(document.getElementById(url));
$element.find('.leancloud-visitors-count').text(counter.get('time'));
},
error: function(counter, error) {
console.log('Failed to save Visitor num, with error message: ' + error.message);
}
});
} else {
var newcounter = new Counter();
/* Set ACL */
var acl = new AV.ACL();
acl.setPublicReadAccess(true);
acl.setPublicWriteAccess(true);
newcounter.setACL(acl);
/* End Set ACL */
newcounter.set("title", title);
newcounter.set("url", url);
newcounter.set("time", 1);
newcounter.save(null, {
success: function(newcounter) {
var $element = $(document.getElementById(url));
$element.find('.leancloud-visitors-count').text(newcounter.get('time'));
},
error: function(newcounter, error) {
console.log('Failed to create');
}
});
}
},
error: function(error) {
console.log('Error:' + error.code + " " + error.message);
}
});
}
$(function() {
var Counter = AV.Object.extend("Counter");
if ($('.leancloud_visitors').length == 1) {
addCount(Counter);
} else if ($('.post-title-link').length > 1) {
showTime(Counter);
}
});
< / script >
< script >
(function(){
var bp = document.createElement('script');
var curProtocol = window.location.protocol.split(':')[0];
if (curProtocol === 'https') {
bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
}
else {
bp.src = 'http://push.zhanzhang.baidu.com/push.js';
}
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(bp, s);
})();
< / script >
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< link rel = "stylesheet" href = "/lib/needsharebutton/needsharebutton.css" >
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< script src = "/lib/needsharebutton/needsharebutton.js" > < / script >
< script >
pbOptions = {};
pbOptions.iconStyle = "box";
pbOptions.boxForm = "horizontal";
pbOptions.position = "bottomCenter";
pbOptions.networks = "Weibo,Wechat,Douban,QQZone,Twitter,Facebook";
new needShareButton('#needsharebutton-postbottom', pbOptions);
flOptions = {};
flOptions.iconStyle = "box";
flOptions.boxForm = "horizontal";
flOptions.position = "middleRight";
flOptions.networks = "Weibo,Wechat,Douban,QQZone,Twitter,Facebook";
new needShareButton('#needsharebutton-float', flOptions);
< / script >
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< script type = "text/javascript" src = "/js/src/js.cookie.js?v=5.1.4" > < / script >
< script type = "text/javascript" src = "/js/src/scroll-cookie.js?v=5.1.4" > < / script >
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< / body >
< / html >
