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< h1 id = "PE文件格式" > < a href = "#PE文件格式" class = "headerlink" title = "PE文件格式" > < / a > PE文件格式< / h1 > < p > PE(Portable Executable)是Win32平台下可执行文件遵守的数据格式。常见的可执行文件（ ） ， ， < strong > 在程序被执行时， ， < / strong > < br > PE文件格式把可执行文件分成若干个数据节（ ） ， ， ： < / p >
< ul >
< li > < code > .text< / code > 由编译器产生，存放着二进制的机器代码，也是反汇编和调试的对象< / li >
< li > < code > .data< / code > 初始化的数据块，如宏定义、全局变量、静态变量等< / li >
< li > < code > .idata< / code > 可执行文件所使用的动态链接库等外来函数与文件信息< / li >
< li > < code > .rsrc< / code > 存放程序的资源，如图标、菜单等< br > 除此之外，还有可能有< code > .reloc< / code > ,< code > .edata< / code > ,< code > .tls< / code > ,< code > .rdata< / code > < / li >
< / ul >
< h1 id = "0x01-PE文件与虚拟内存之间的映射" > < a href = "#0x01-PE文件与虚拟内存之间的映射" class = "headerlink" title = "0x01 PE文件与虚拟内存之间的映射" > < / a > 0x01 PE文件与虚拟内存之间的映射< / h1 > < h2 id = "虚拟内存" > < a href = "#虚拟内存" class = "headerlink" title = "虚拟内存" > < / a > 虚拟内存< / h2 > < p > Windows的内存可以被分为两个层面： ， ， ， ， < br > 如果我们把这看成银行，那么就很好理解了。< / p >
< ul >
< li > 进程相当于储户< / li >
< li > 内存管理器相当于银行< / li >
< li > 物理内存相当于钞票< / li >
< li > 虚拟内存相当于存款< / li >
< / ul >
< h2 id = "映射关系" > < a href = "#映射关系" class = "headerlink" title = "映射关系" > < / a > 映射关系< / h2 > < ol >
< li > 在漏洞挖掘中,经常需要的两种操作：< / li >
< / ol >
< ul >
< li > 静态反编译工具看到的是PE文件中某条指令的位置是相对与磁盘而言的， < strong > 文件偏移< / strong > ，我们可能还需要知道这条指令在内存中的位置，这个位置就是虚拟内存地址(VA)< / li >
< li > 反过来，在调试时看到的某条指令的地址是 < strong > 虚拟内存地址（ ） < / strong > ， < / li >
< / ul >
< ol start = "2" >
< li > 几个重要概念< / li >
< / ol >
< ul >
< li > 文件偏移地址(File Offset)： < br > 数据在PE文件中的地址叫做文件偏移地址,可以理解为就是文件地址。这是文件在磁盘上存放相对与文件开头的偏移。< / li >
< li > 装载基址(Image Base):< br > PE装入内存时的基地址。默认情况下， < code > 0x00400000< / code > ,DLL文件是< code > 0x10000000< / code > 。这些位置可能通过编译选项修改< / li >
< li > 虚拟内存地址(Virtual Address,VA )： < br > PE文件中的指令装入内存后的地址。< / li >
< li > 相对虚拟地址(Relative Virtual Address, RVA)： < br > 相对虚拟地址是内存地址相对于映射基址的偏移量。< / li >
< / ul >
< ol start = "3" >
< li > < p > 虚拟内存地址，装载基址，相对虚拟内存地址三者之间的关系:< / p >
< blockquote >
< p > VA = Image Base + RVA< / p >
< / blockquote >
< / li >
< li > < p > 文件偏移地址与相对虚拟地址：< br > 文件偏移地址是相对于文件开始处0字节的偏移,RVA(相对虚拟地址)则是相对于装载基址0x00400000处的偏移.由于操作系统在装载时“基本”上保持PE中的数据结构， （ ） < br > PE文件中的数据按照磁盘数据标准存放， ， ， ， < br > 当代码装入后， ， ， ， < br > 由于内存中数据节相对于装载基址的偏移量和文件中数据节的偏移量有上述差异，所以进行文件偏移到内存地址之间的换算时，还要看所转换的地址位于第几个节内:< / p >
< blockquote >
< p > 文件偏移地址 = 虚拟内存地址(VA) - 装载基址(Image Base) - 节偏移< br > < / p >
< / blockquote >
< / li >
< li > < p > 工具< br > < a href = "https://tools.pediy.com/win/PE_tools/Lordpe/LPE-DLX.rar" target = "_blank" rel = "noopener" > LordPE DLX增强版(2017..6.08)< / a > < br > < a href = "https://tools.pediy.com/win/Resource/Resource%20Hacker/reshhack3.4.zip" target = "_blank" rel = "noopener" > Resource Hacker 3.4.0< / a > < br > < a href = "https://download.cnet.com/PE-Viewer/3000-2352_4-10966763.html" target = "_blank" rel = "noopener" > PE viewer< / a > < / p >
< / li >
< / ol >
< h1 id = "0x02-链接库与函数" > < a href = "#0x02-链接库与函数" class = "headerlink" title = "0x02 链接库与函数" > < / a > 0x02 链接库与函数< / h1 > < p > 对于一个可执行程序，可以收集到最有用的信息就是导入表。导入函数是程序所使用的但存储在另一程序中的那些函数。通过导入函数连接，使得不必重新在多个程序中重复实现特定功能。< / p >
< ol >
< li > 静态链接、运行时链接与动态链接。< br > 静态链接：当一个库被静态链接到可执行程序时，所有这个库中的代码都会被复制到可执行程序中，这使得可执行程序增大许多，而且在分析代码时，很难区分静态链接的代码和自身代码。< br > 运行时链接：在恶意代码中常用（加壳或混淆时），只有当需要使用函数时，才链接到库。< br > 动态链接：当代码被动态链接时，宿主操作系统会在程序装载时搜索所需代码库，如果程序调用了被链接的库函数，这个函数会在代码库中执行。< br > LoadLibrary和GetProcAddress允许一个程序访问系统上任何库中的函数， ， < br > PE文件头存储了每个将被装载的库文件， < / li >
< li > 工具Dependency Walker< br > < a href = "http://www.dependencywalker.com/" target = "_blank" rel = "noopener" > Dependency Walker< / a > < / li >
< li > < p > 常见dll程序< br > < strong > < em > kernel32.dll< / em > < / strong > < br > kernel32.dll是Windows 9x/Me中非常重要的32位动态链接库文件， ， ， ， < br > < strong > < em > user32.dll< / em > < / strong > < br > user32.dll是Windows用户界面相关应用程序接口， ， ， < br > 在早期32-bit 版本的Windows中， ， （ ） ， ， ， ， ， < br > < strong > < em > gdi32.dll< / em > < / strong > < br > gdi32.dll是Windows GDI图形用户界面相关程序， < br > < strong > < em > comdlg32.dll< / em > < / strong > < br > comdlg32.dll是Windows应用程序公用对话框模块， < br > < strong > < em > advapi32.dll< / em > < / strong > < br > advapi32.dll是一个高级API应用程序接口服务库的一部分， ， < br > < strong > < em > shell32.dll< / em > < / strong > < br > shell32.dll是Windows的32位外壳动态链接库文件， ， < br > 严格来讲， ， ， < br > < strong > < em > ole32.dll< / em > < / strong > < br > ole32.dll是对象链接和嵌入相关模块。< br > < strong > < em > odbc32.dll< / em > < / strong > < br > odbc32.dll是ODBC数据库查询相关文件。< / p >
< / li >
< li > < p > 导入函数与导出函数< br > 导入函数和导出函数都是用来和其他程序和代码进行交互时使用的， ， ， ， < / p >
< / li >
< / ol >
< h1 id = "0x03-PE文件的结构" > < a href = "#0x03-PE文件的结构" class = "headerlink" title = "0x03 PE文件的结构" > < / a > 0x03 PE文件的结构< / h1 > < table >
< thead >
< tr >
< th > PE文件结构< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td > MZ文件头< / td >
< / tr >
< tr >
< td > DOS插桩程序< / td >
< / tr >
< tr >
< td > 字串“PE\0\0”(4字节)< / td >
< / tr >
< tr >
< td > 映像文件头< / td >
< / tr >
< tr >
< td > 可选映像头< / td >
< / tr >
< tr >
< td > Section table(节表)< / td >
< / tr >
< tr >
< td > Section 1< / td >
< / tr >
< tr >
< td > Section 2< / td >
< / tr >
< tr >
< td > …..< / td >
< / tr >
< / tbody >
< / table >
< ol >
< li > DOS程序头(4H字节)< br > 包括MZ文件头和DOS插桩程序。MZ文件头开始两个字节为4D5A。< / li >
< li > NT映像头(14H字节)< br > 存放PE整个文件信息分布的重要字段。包括： < / li >
< / ol >
< ul >
< li > 签名（ ） ： ’ ’ ， ’ ’ ， < / li >
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< li > 映像文件头（ ） ： ， ： < 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 > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > typedef struct _IMAGE_FILE_HEADER { < / span > < br > < span class = "line" > WORD Machine; //运行平台< / span > < br > < span class = "line" > WORD NumberOfSections; //节(section)数目 < / span > < br > < span class = "line" > DWORD TimeDateStamp; //时间日期标记 < / span > < br > < span class = "line" > DWORD PointerToSymbolTable; //COFF符号指针， < / span > < br > < span class = "line" > DWORD NumberOfSymbols; //符号数 < / span > < br > < span class = "line" > WORD SizeOfOptionalHeader; //可选部首长度， < / span > < br > < span class = "line" > WORD Characteristics; //文件属性< / span > < br > < span class = "line" > } < / span > < br > < / pre > < / td > < / tr > < / table > < / figure >
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< / li >
< / ul >
< ol start = "3" >
< li > < p > 可选映像头(OptionalHeader)< br > 包含PE文件的逻辑分布信息， ： < / p >
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< 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 > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > typedef struct _IMAGE_OPTIONAL_HEADER { < / span > < br > < span class = "line" > WORD Magic; //代表的是文件的格式< / span > < br > < span class = "line" > BYTE MajorLinkerVersion;< / span > < br > < span class = "line" > BYTE MinorLinkerVersion;< / span > < br > < span class = "line" > DWORD SizeOfCode;< / span > < br > < span class = "line" > DWORD SizeOfInitializedData;< / span > < br > < span class = "line" > DWORD SizeOfUninitializedData;< / span > < br > < span class = "line" > DWORD AddressOfEntryPoint; //保存着EP的RVA。也就是最先执行代码起始地址。< / span > < br > < span class = "line" > DWORD BaseOfCode; //表示代码段起始RVA先看他的值， < / span > < br > < span class = "line" > DWORD BaseOfData;< / span > < br > < span class = "line" > DWORD ImageBase; //默认装入基地址< / span > < br > < span class = "line" > DWORD SectionAlignment; //节区在内存中的最下单位< / span > < br > < span class = "line" > DWORD FileAlignment; //节区在磁盘中的最小单位< / span > < br > < span class = "line" > WORD MajorOperatingSystemVersion;< / span > < br > < span class = "line" > WORD MinorOperatingSystemVersion;< / span > < br > < span class = "line" > WORD MajorImageVersion;< / span > < br > < span class = "line" > WORD MinorImageVersion;< / span > < br > < span class = "line" > WORD MajorSubsystemVersion;< / span > < br > < span class = "line" > WORD MinorSubsystemVersion;< / span > < br > < span class = "line" > DWORD Win32VersionValue;< / span > < br > < span class = "line" > DWORD SizeOfImage; //装入内存后的总尺寸< / span > < br > < span class = "line" > DWORD SizeOfHeaders; //头尺寸=NT映像头+节表< / span > < br > < span class = "line" > DWORD CheckSum;< / span > < br > < span class = "line" > WORD Subsystem;< / span > < br > < span class = "line" > WORD DllCharacteristics;< / span > < br > < span class = "line" > DWORD SizeOfStackReserve;< / span > < br > < span class = "line" > DWORD SizeOfStackCommit;< / span > < br > < span class = "line" > DWORD SizeOfHeapReserve;< / span > < br > < span class = "line" > DWORD SizeOfHeapCommit;< / span > < br > < span class = "line" > DWORD LoaderFlags;< / span > < br > < span class = "line" > DWORD NumberOfRvaAndSizes;< / span > < br > < span class = "line" > IMAGE_DATA_DIRECTORY DataDirectory[IMAGE_NUMBEROF_DIRECTORY_ENTRIES];< / span > < br > < span class = "line" > } IMAGE_OPTIONAL_HEADER, *PIMAGE_OPTIONAL_HEADER;< / span > < br > < / pre > < / td > < / tr > < / table > < / figure >
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< / li >
< li > < p > 节表< br > 实际上是一个结构数组， （ ） < / p >
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< 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 > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > typedef struct _IMAGE_SECTION_HEADER { < / span > < br > < span class = "line" > BYTE Name[IMAGE_SIZEOF_SHORT_NAME];< / span > < br > < span class = "line" > union { < / span > < br > < span class = "line" > DWORD PhysicalAddress;< / span > < br > < span class = "line" > DWORD VirtualSize; //该节的实际字节数< / span > < br > < span class = "line" > } Misc;< / span > < br > < span class = "line" > DWORD VirtualAddress; //本节的相对虚拟地址< / span > < br > < span class = "line" > DWORD SizeOfRawData; //对齐后的节尺寸< / span > < br > < span class = "line" > DWORD PointerToRawData; //本节在文件中的地址< / span > < br > < span class = "line" > DWORD PointerToRelocations; //本节调入内存后的存放位置< / span > < br > < span class = "line" > DWORD PointerToLinenumbers;< / span > < br > < span class = "line" > WORD NumberOfRelocations;< / span > < br > < span class = "line" > WORD NumberOfLinenumbers;< / span > < br > < span class = "line" > DWORD Characteristics; //节的属性< / span > < br > < span class = "line" > } IMAGE_SECTION_HEADER, *PIMAGE_SECTION_HEADER;< / span > < br > < / pre > < / td > < / tr > < / table > < / figure >
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< / li >
< li > < p > 节< / p >
< / li >
< / ol >
< ul >
< li > < p > 引入函数节(.rdata/.idata)< / p >
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< 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 > < / pre > < / td > < td class = "code" > < pre > < span class = "line" > typedef struct _IMAGE_IMPORT_DESCRIPTOR { < / span > < br > < span class = "line" > union { < / span > < br > < span class = "line" > DWORD Characteristics; // 0 for terminating null import descriptor< / span > < br > < span class = "line" > DWORD OriginalFirstThunk; // RVA to original unbound IAT (PIMAGE_THUNK_DATA)< / span > < br > < span class = "line" > } ;< / span > < br > < span class = "line" > DWORD TimeDateStamp; // 0 if not bound,< / span > < br > < span class = "line" > // -1 if bound, and real datetime stamp< / span > < br > < span class = "line" > // in IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT (new BIND)< / span > < br > < span class = "line" > // O.W. date/time stamp of DLL bound to (Old BIND)< / span > < br > < span class = "line" > < / span > < br > < span class = "line" > DWORD ForwarderChain; // -1 if no forwarders< / span > < br > < span class = "line" > DWORD Name;< / span > < br > < span class = "line" > DWORD FirstThunk; // RVA to IAT (if bound this IAT has actual addresses)< / span > < br > < span class = "line" > } IMAGE_IMPORT_DESCRIPTOR;< / span > < br > < / pre > < / td > < / tr > < / table > < / figure >
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< / li >
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< li > < p > 一个exe程序加载dll的IMAGE_IMPORT_DESCRIPTOR< br > < img src = "https://res.cloudinary.com/dozyfkbg3/image/upload/v1556519313/pwn/1506049226526485.jpg" alt > < / p >
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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 >
