手写简单PE

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环境工具：
Windows 10

010Editor

目标程序功能:

调用MessageBoxA弹出消息框。

 

1.构造DOS头

typedef struct _IMAGE_DOS_HEADER { // DOS .EXE header

WORD e_magic; // Magic number

WORD e_cblp; // Bytes on last page of file

WORD e_cp; // Pages in file

WORD e_crlc; // Relocations

WORD e_cparhdr; // Size of header in paragraphs

WORD e_minalloc; // Minimum extra paragraphs needed

WORD e_maxalloc; // Maximum extra paragraphs needed

WORD e_ss; // Initial (relative) SS value

WORD e_sp; // Initial SP value

WORD e_csum; // Checksum

WORD e_ip; // Initial IP value

WORD e_cs; // Initial (relative) CS value

WORD e_lfarlc; // File address of relocation table

WORD e_ovno; // Overlay number

WORD e_res[4]; // Reserved words

WORD e_oemid; // OEM identifier (for e_oeminfo)

WORD e_oeminfo; // OEM information; e_oemid specific

WORD e_res2[10]; // Reserved words

LONG e_lfanew; // File address of new exe header

} IMAGE_DOS_HEADER, *PIMAGE_DOS_HEADER;


关键字段:
WORD e_magic; 　　 MZ 4D 5A (标识符)
LONG e_lfanew; 　 40h 40 00 00 00(DosStub去除后，IMAGE_DOS_HEADER 的结构体大小就是Dos头大小)

4D 5A 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 40 00 00 00


2.构造NT头

typedef struct _IMAGE_NT_HEADERS64 {

DWORD Signature;

IMAGE_FILE_HEADER FileHeader;

IMAGE_OPTIONAL_HEADER64 OptionalHeader;

} IMAGE_NT_HEADERS64, *PIMAGE_NT_HEADERS64;

 

typedef struct _IMAGE_NT_HEADERS {

DWORD Signature; //标示符(PE)

IMAGE_FILE_HEADER FileHeader; //文件头结构体

IMAGE_OPTIONAL_HEADER32 OptionalHeader; //可选映像头结构体


} IMAGE_NT_HEADERS32, *PIMAGE_NT_HEADERS32;

关键字段:
DWORD Signature; 　　50 45 00 00 (标识符)

IMAGE_FILE_HEADER FileHeader;

typedef struct _IMAGE_FILE_HEADER {

WORD Machine; 　　　//运行平台

WORD NumberOfSections; //文件区块数量

DWORD TimeDateStamp; //文件创建日期和时间

DWORD PointerToSymbolTable; //指向符号表(主要用于调试)

DWORD NumberOfSymbols; //符号表中符号个数

WORD SizeOfOptionalHeader; //IMAGE_OPTIONAL_HEADER32结构大小

WORD Characteristics; 　 //文件属性

} IMAGE_FILE_HEADER, *PIMAGE_FILE_HEADER;

关键字段
2.1 WORD Machine; 　　　　　　　　　4c 01 (0x014c x86)
2.2 WORD NumberOfSections;　　　　　02 00 (1.text 2.rdata)
2.3 WORD SizeOfOptionalHeader; 　　　E0 00 (NT扩展头大小)
2.4 WORD Characteristics; 　　　　　　0F 01 (可以自定义)

IMAGE_OPTIONAL_HEADER32 OptionalHeader; // 可选映像头结构体

typedef struct _IMAGE_OPTIONAL_HEADER

{

//

// Standard fields.

//

+18h WORD Magic; // 标志字, ROM 映像（0107h）,普通可执行文件（010Bh）

+1Ah BYTE MajorLinkerVersion; // 链接程序的主版本号

+1Bh BYTE MinorLinkerVersion; // 链接程序的次版本号

+1Ch DWORD SizeOfCode; // 所有含代码的节的总大小

+20h DWORD SizeOfInitializedData; // 所有含已初始化数据的节的总大小

+24h DWORD SizeOfUninitializedData; // 所有含未初始化数据的节的大小

+28h DWORD AddressOfEntryPoint; //-----> 程序执行入口RVA(OEP)

+2Ch DWORD BaseOfCode; // 代码的区块的起始RVA

+30h DWORD BaseOfData; // 数据的区块的起始RVA

//

// NT additional fields. 以下是属于NT结构增加的领域。

//

+34h DWORD ImageBase; // ---------->程序的首选装载地址(基地址)

+38h DWORD SectionAlignment; // 内存中的区块的对齐大小

+3Ch DWORD FileAlignment; // 文件中的区块的对齐大小

+40h WORD MajorOperatingSystemVersion; // 要求操作系统最低版本号的主版本号

+42h WORD MinorOperatingSystemVersion; // 要求操作系统最低版本号的副版本号

+44h WORD MajorImageVersion; // 可运行于操作系统的主版本号

+46h WORD MinorImageVersion; // 可运行于操作系统的次版本号

+48h WORD MajorSubsystemVersion; // 要求最低子系统版本的主版本号

+4Ah WORD MinorSubsystemVersion; // 要求最低子系统版本的次版本号

+4Ch DWORD Win32VersionValue; // 莫须有字段，不被病毒利用的话一般为0

+50h DWORD SizeOfImage; // 映像装入内存后的总尺寸

+54h DWORD SizeOfHeaders; // 所有头 + 区块表的尺寸大小

+58h DWORD CheckSum; // 映像的校检和

+5Ch WORD Subsystem; // 可执行文件期望的子系统

+5Eh WORD DllCharacteristics; // DllMain()函数何时被调用，默认为 0

+60h DWORD SizeOfStackReserve; // 初始化时的栈大小

+64h DWORD SizeOfStackCommit; // 初始化时实际提交的栈大小

+68h DWORD SizeOfHeapReserve; // 初始化时保留的堆大小

+6Ch DWORD SizeOfHeapCommit; // 初始化时实际提交的堆大小

+70h DWORD LoaderFlags; // 与调试有关，默认为 0

+74h DWORD NumberOfRvaAndSizes; // 下边数据目录的项数，这个字段自Windows NT 发布以来 // 一直是16

+78h IMAGE_DATA_DIRECTORY DataDirectory[IMAGE_NUMBEROF_DIRECTORY_ENTRIES];

//-----> 数据目录表

} IMAGE_OPTIONAL_HEADER32, *PIMAGE_OPTIONAL_HEADER32;

关键字段(可选映像头)

关键字段
WORD Magic;　　　　　　　　　　　　0B 01 (文件类型:PE32文件)
DWORD AddressOfEntryPoint;　　　　　00 10 00 00(.text在文件中200h位置，转内存偏移后为1000h)
DWORD ImageBase;　　　　　　　　　00 00 04 00 (PE文件在内存的优先加载起始地址VA)
DWORD SectionAlignment; 　　　　　　 00 10 00 00 (内存对齐)
DWORD FileAlignment; 　　　　　　　　 00 02 00 00 (文件对齐)
WORD MajorOperatingSystemVersion; 　　 06 00
WORD MajorSubsystemVersion; 　　　　　 06 00
DWORD SizeOfImage; 　　　　　　　　　 7E 20 00 00 (加载到内存中镜像大小)
DWORD SizeOfHeaders; 　　　　　　　　 00 02 00 00 (Dos+NT+Section :在文件中未超过200h)
WORD Subsystem; 　　　　　　　　　　　03 00 (使用界面的子系统:(CUI) subsystem)
WORD DllCharacteristics; 　　　　　　　　 00 81 (DLL文件属性)
DWORD NumberOfRvaAndSizes; 　　　　 10 00 (表示数据目录结构的数量.默认16个)
IMAGE_DATA_DIRECTORY DataDirectory[IMAGE_NUMBEROF_DIRECTORY_ENTRIES];
typedef struct _IMAGE_DATA_DIRECTORY {
DWORD VirtualAddress;

DWORD Size;

} IMAGE_DATA_DIRECTORY, *PIMAGE_DATA_DIRECTORY;

IMAGE_DATA_DIRECTORY DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress

// 2000h+10h(IAT字节数) =>10 20 00 00

IMAGE_DATA_DIRECTORY DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].Size

// 2个Dll,即两个导入表结构体(20个00结尾)=>3C 00 00 00

( #define IMAGE_DIRECTORY_ENTRY_IMPORT 1 // Import Directory )

 

50 45 00 00 4C 01 02 00 00 00 00 00 00 00 00 00

00 00 00 00 E0 00 0F 01 0B 01 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00

00 00 00 00 00 00 40 00 00 10 00 00 00 02 00 00

06 00 00 00 00 00 00 00 06 00 00 00 00 00 00 00

7E 20 00 00 00 02 00 00 00 00 00 00 03 00 00 81

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00

10 20 00 00 3C 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00

 

3.构造区段头

typedef struct _IMAGE_SECTION_HEADER {

BYTE Name[IMAGE_SIZEOF_SHORT_NAME]; // 节表名称,如“.text”

union {

DWORD PhysicalAddress; // 物理地址

DWORD VirtualSize; // 真实长度，这两个值是一个联合结构，可以使用其中的任何一个，一般是取后一个

} Misc;

DWORD VirtualAddress; // 节区的 RVA 地址

DWORD SizeOfRawData; // 在文件中对齐后的尺寸

DWORD PointerToRawData; // 在文件中的偏移量

DWORD PointerToRelocations; // 在OBJ文件中使用，重定位的偏移

DWORD PointerToLinenumbers; // 行号表的偏移（供调试使用地）

WORD NumberOfRelocations; // 在OBJ文件中使用，重定位项数目

WORD NumberOfLinenumbers; // 行号表中行号的数目

DWORD Characteristics; // 节属性如可读，可写，可执行等


} IMAGE_SECTION_HEADER, *PIMAGE_SECTION_HEADER;

关键字段
1.text
BYTE Name[IMAGE_SIZEOF_SHORT_NAME]; 　　2E 74 65 78 74 00 00 00(区段名称)
DWORD VirtualSize; 　　　　　　　　　　　　　　 22 00 00 00 (有效的OpCode数目)
DWORD VirtualAddress; 　　　　　　　　　　　　 00 10 00 00 (区段rva：200h映射到内存中为1000h)
DWORD SizeOfRawData; 　　　　　　　　　　　　 00 02 00 00 (在文件中的对齐后大小)
DWORD PointerToRawData; 　　　　　　　　　　 00 02 00 00 (在文件中相对与0的偏移)
DWORD Characteristics; 　　　　　　　　　　　　 E0 00 00 E0 (区段属性可以自定义)
2.rdata
BYTE Name[IMAGE_SIZEOF_SHORT_NAME]; 　　 2E 72 64 61 74 61 00 00(区段名称)

DWORD VirtualSize; 　　　　　　　　　　　　　　 7E 00 00 00 (有效的字节数目)

DWORD VirtualAddress; 　　　　　　　　 　　　　 00 20 00 00 (区段rva：400h映射到内存中为2000h)

DWORD SizeOfRawData; 　　　　　　　　　　　　 00 02 00 00 (在文件中的对齐后大小)

DWORD PointerToRawData; 　　　　 　　　　　　 00 04 00 00 (在文件中相对与0的偏移)

DWORD Characteristics; 　　　　　　　　　　　　 E0 00 00 E0 (区段属性可以自定义)

 

2E 74 65 78 74 00 00 00 22 00 00 00 00 10 00 00

00 02 00 00 00 02 00 00 00 00 00 00 00 00 00 00

00 00 00 00 E0 00 00 E0 2E 72 64 61 74 61 00 00

7E 00 00 00 00 20 00 00 00 02 00 00 00 04 00 00

00 00 00 00 00 00 00 00 00 00 00 00 E0 00 00 E0

 

4.构造区段身体

.text段

VS程序IAT调用为:FF 15 XXXXXXXX(IAT地址)(有2个dll)

IAT1:FOA:400h ==> RVA: 2000h ==>VA:400000h + 2000h==>402000h

IAT2:FOA:408h ==> RVA: 2008h ==>VA:400000h + 2008h==>402008h

伪代下：

push 0x0;

push 0x0;

push 0x0;

push 0x0;

call MessageBoxA; // MessageBoxA()

push 0x0;

call ExitProcess; // ExitProcess()

 

push 0x0; 6A 00

push 0x0; 6A 00

push 0x0; 6A 00

push 0x0; 6A 00

call MessageBoxA; FF 15 00 20 40 00

push 0x0; 6A 00

call ExitProcess; 　 FF 15 08 20 40 00

 

.rdata段

typedef struct _IMAGE_IMPORT_DESCRIPTOR {

union {

DWORD Characteristics; // 0 for terminating null import descriptor

DWORD OriginalFirstThunk; // RVA to original unbound IAT (PIMAGE_THUNK_DATA) INT的地址

} DUMMYUNIONNAME;

DWORD TimeDateStamp; // 0 if not bound,

// -1 if bound, and real date ime stamp

// in IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT (new BIND)

// O.W. date/time stamp of DLL bound to (Old BIND)

 

DWORD ForwarderChain; // -1 if no forwarders

DWORD Name; //库名称字符串地址

DWORD FirstThunk; // RVA to IAT (if bound this IAT has actual addresses) IAT的地址

} IMAGE_IMPORT_DESCRIPTOR;

typedef IMAGE_IMPORT_DESCRIPTOR UNALIGNED *PIMAGE_IMPORT_DESCRIPTOR;

 

typedef struct _IMAGE_THUNK_DATA32 {

union {

DWORD ForwarderString; // PBYTE

DWORD Function; // PDWORD

DWORD Ordinal;

DWORD AddressOfData; // PIMAGE_IMPORT_BY_NAME

} u1;

} IMAGE_THUNK_DATA32;

typedef IMAGE_THUNK_DATA32 * PIMAGE_THUNK_DATA32;

//

// Import Format

//

typedef struct _IMAGE_IMPORT_BY_NAME {

WORD Hint; //ordinal

CHAR Name[1]; //function name string

} IMAGE_IMPORT_BY_NAME, *PIMAGE_IMPORT_BY_NAME;

5C 20 00 00 00 00 00 00 75 20 00 00 00 00 00 00

4C 20 00 00 00 00 00 00 00 00 00 00 6A 20 00 00

00 20 00 00 54 20 00 00 00 00 00 00 00 00 00 00

83 20 00 00 08 20 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 5C 20 00 00

00 00 00 00 75 20 00 00 00 00 00 00 00 00 4D 65

73 73 61 67 65 42 6F 78 41 00 55 53 45 52 33 32

2E 64 6C 6C 00 00 00 45 78 69 74 50 72 6F 63 65

73 73 00 4B 45 52 4E 45 4C 33 32 2E 64 6C 6C 00

 

IAT:

typedef struct _IMAGE_THUNK_DATA32 {

union {

DWORD ForwarderString; // PBYTE

DWORD Function; // PDWORD

DWORD Ordinal;

DWORD AddressOfData; // PIMAGE_IMPORT_BY_NAME

} u1;

} IMAGE_THUNK_DATA32;

typedef IMAGE_THUNK_DATA32 * PIMAGE_THUNK_DATA32;

关键字段
DWORD AddressOfData1; 　　　　 MessageBoxA ==>5C 20 00 00 00 00 00 00 (以0结尾)
DWORD AddressOfData2; 　　　　 ExitProcess ==>75 20 00 00 00 00 00 00 (以0结尾)

 

Import Table:

typedef struct _IMAGE_IMPORT_DESCRIPTOR {

union {

DWORD Characteristics; // 0 for terminating null import descriptor

DWORD OriginalFirstThunk; //指向INT =>4C 20 00 00

} DUMMYUNIONNAME;

DWORD ForwarderChain; // -1 if no forwarders =>00 00 00 00

DWORD Name; //指向库文件名(USER32.DLL) => 6A 20 00 00

DWORD TimeDateStamp; // 0 if not bound =>00 00 00 00

DWORD FirstThunk; // RVA to IAT => 00 20 00 00

} IMAGE_IMPORT_DESCRIPTOR;

typedef IMAGE_IMPORT_DESCRIPTOR UNALIGNED *PIMAGE_IMPORT_DESCRIPTOR;

关键字段

DWORD AddressOfData1; 　　　　 MessageBoxA ==>5C 20 00 00 00 00 00 00 (以0结尾)

DWORD AddressOfData2; 　　　　 ExitProcess ==>75 20 00 00 00 00 00 00 (以0结尾)

 

 

INT:

typedef struct _IMAGE_THUNK_DATA32 {

union {

DWORD ForwarderString; 　　// PBYTE

DWORD Function; // PDWORD

DWORD Ordinal;

DWORD AddressOfData; 　// PIMAGE_IMPORT_BY_NAME

} u1;

} IMAGE_THUNK_DATA32;

typedef IMAGE_THUNK_DATA32 * PIMAGE_THUNK_DATA32;

关键字段

DWORD AddressOfData1; 　　　　 MessageBoxA ==>5C 20 00 00 00 00 00 00 (以0结尾)

DWORD AddressOfData2; 　　　　 ExitProcess ==>75 20 00 00 00 00 00 00 (以0结尾)

 

HintName:

typedef struct _IMAGE_IMPORT_BY_NAME {

WORD Hint; //名称导入 =>00 00

CHAR Name[1];

} IMAGE_IMPORT_BY_NAME, *PIMAGE_IMPORT_BY_NAME;

关键字段
1.MessageBoxA
1.1 WORD Hint; 　　　　　　　　API名称在DLL中的编号==>00 00 (名称导入)
1.2 CHAR Name[1]; 　　　　　　 MessageBoxA名称 ==>4D 65 73 73 61 67 65 42 6F 78 41
　　　　　　　　　　　　　　　 USER32.dll ==>00 55 53 45 52 33 32 2E 64 6C 6C 00
2.ExitProcess
WORD Hint; 　　　　　　　　　 API名称在DLL中的编号==>00 00 (名称导入)
CHAR Name[1]; 　　　　　　　  ExitProcess名称 ==>45 78 69 74 50 72 6F 63 65 73 73
　　　　　　　　　　　　　　　 KERNEL32.dll ==>00 4B 45 52 4E 45 4C 33 32 2E 64 6C 6C 00

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