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[原创]手工添加外部DLL输入表并调用添加函数
发表于: 2018-12-2 16:06 9213

[原创]手工添加外部DLL输入表并调用添加函数

2018-12-2 16:06
9213

许多时候需要在其他程序里面调用自己写的DLL,这就需要在其他程序里面添加自己DLL的输入表,要添加输入表我们就要先了解一下输入表的结构:

我们先看一下我们需要修改的程序的相关信息
我们先看一下我们需要修改的程序的相关信息
-----------------------------------FileHead
Machine:              	014C
NumberOfSections:     	0002
TimeDateStamp:        	00000000
PointerToSymbolTable: 	00000000
NumberOfSymbols:      	00000000
SizeOfOptionalHeader: 	00E0
Characteristics:      	030F
-----------------------------------OptionalHeader
Magic:                       010B
MajorLinkerVersion:          06
MinorLinkerVersion:          00
SizeOfCode:                  00000000
SizeOfInitializedData:       00000000
SizeOfUninitializedData:     00000000
AddressOfEntryPoint:         00001040
BaseOfCode:                  00001000
BaseOfData:                  00002000
//NT additional fields...
ImageBase:                   00400000
SectionAlignment:            00001000
FileAlignment:               00000200
MajorOperatingSystemVersion: 0004
MinorOperatingSystemVersion: 0000
MajorImageVersion:           0000
MinorImageVersion:           0000
MajorSubsystemVersion:       0004
MinorSubsystemVersion:       0000
Win32VersionValue:           00000000
SizeOfImage:                 00003000
SizeOfHeaders:               00000200
CheckSum:                    00008217
Subsystem:                   0002
DllCharacteristics:          0000
SizeOfStackReserve:          00100000
SizeOfStackCommit:           00001000
SizeOfHeapReserve:           00100000
SizeOfHeapCommit:            00001000
LoaderFlags:                 00000000
NumberOfRvaAndSizes:         00000010
------------------------------------DataDirectory
No.  VirtualAddress  Size
0	00000000	00000000	EXPORT
1	00002040	00000050	IMPORT
2	00000000	00000000	RESOURCE
3	00000000	00000000	EXCEPTION
4	00000000	00000000	SECURITY
5	00000000	00000000	BASERELOC
6	00000000	00000000	DEBUG
7	00000000	00000000	ARCHITECTURE
8	00000000	00000000	GLOBALPTR
9	00000000	00000000	TLS
10	00000000	00000000	LOAD_CONFIG
11	00000000	00000000	BOUND_IMPORT
12	00002090	00000038	IAT
13	00000000	00000000	DELAY_IMPORT
14	00000000	00000000	COM_DESCRIPTOR
15	00000000	00000000	...
--------------------------------Section
Name VirtualAddress  VirtualSize PointerToRawData  SizeOfRawData Characteristics
.text	00001000	00000368	00000200	00000400	60000020	
.data	00002000	000001C0	00000600	00000200	C0000040	
--------------------------------Import
ImpAddr: 00000640
OriginalFirstThunk: 000020C8
TimeDateStamp     : 00000000
ForwarderChain    : 00000000
FirstThunk        : 00002090
●--user32.dll
pNameAddr: 00000690
  0000	00000690	MessageBoxA
 
OriginalFirstThunk: 000020D0
TimeDateStamp     : 00000000
ForwarderChain    : 00000000
FirstThunk        : 00002098
●--msvcrt.dll
pNameAddr: 00000698
  0000	00000698	__set_app_type
  0000	0000069C	_controlfp
  0000	000006A0	exit
  0000	000006A4	strstr
  0000	000006A8	_XcptFilter
  0000	000006AC	_exit
  0000	000006B0	_except_handler3
 
OriginalFirstThunk: 000020F0
TimeDateStamp     : 00000000
ForwarderChain    : 00000000
FirstThunk        : 000020B8
●--kernel32.dll
pNameAddr: 000006B8
  0000	000006B8	GetCommandLineA
  0000	000006BC	GetStartupInfoA
  0000	000006C0	GetModuleHandleA
从上面的数据可以看出,输入表的地址是:2040,不过这是虚拟地址,要转换成文件的地址,从节的信息可以看出,输入表在.data节,所以这样计算一下:2040-2000+600=640(其中2000是.data节的起始虚拟地址,600是.data节在文件中的起始地址),这就是输入表在文件中的地址了,我们看一下这个地址下的数据:
-----------------------------------FileHead
Machine:              	014C
NumberOfSections:     	0002
TimeDateStamp:        	00000000
PointerToSymbolTable: 	00000000
NumberOfSymbols:      	00000000
SizeOfOptionalHeader: 	00E0
Characteristics:      	030F
-----------------------------------OptionalHeader
Magic:                       010B
MajorLinkerVersion:          06
MinorLinkerVersion:          00
SizeOfCode:                  00000000
SizeOfInitializedData:       00000000
SizeOfUninitializedData:     00000000
AddressOfEntryPoint:         00001040
BaseOfCode:                  00001000
BaseOfData:                  00002000
//NT additional fields...
ImageBase:                   00400000
SectionAlignment:            00001000
FileAlignment:               00000200
MajorOperatingSystemVersion: 0004
MinorOperatingSystemVersion: 0000
MajorImageVersion:           0000
MinorImageVersion:           0000
MajorSubsystemVersion:       0004
MinorSubsystemVersion:       0000
Win32VersionValue:           00000000
SizeOfImage:                 00003000
SizeOfHeaders:               00000200
CheckSum:                    00008217
Subsystem:                   0002
DllCharacteristics:          0000
SizeOfStackReserve:          00100000
SizeOfStackCommit:           00001000
SizeOfHeapReserve:           00100000
SizeOfHeapCommit:            00001000
LoaderFlags:                 00000000
NumberOfRvaAndSizes:         00000010
------------------------------------DataDirectory
No.  VirtualAddress  Size
0	00000000	00000000	EXPORT
1	00002040	00000050	IMPORT
2	00000000	00000000	RESOURCE
3	00000000	00000000	EXCEPTION
4	00000000	00000000	SECURITY
5	00000000	00000000	BASERELOC
6	00000000	00000000	DEBUG
7	00000000	00000000	ARCHITECTURE
8	00000000	00000000	GLOBALPTR
9	00000000	00000000	TLS
10	00000000	00000000	LOAD_CONFIG
11	00000000	00000000	BOUND_IMPORT
12	00002090	00000038	IAT
13	00000000	00000000	DELAY_IMPORT
14	00000000	00000000	COM_DESCRIPTOR
15	00000000	00000000	...
--------------------------------Section
Name VirtualAddress  VirtualSize PointerToRawData  SizeOfRawData Characteristics
.text	00001000	00000368	00000200	00000400	60000020	
.data	00002000	000001C0	00000600	00000200	C0000040	
--------------------------------Import
ImpAddr: 00000640
OriginalFirstThunk: 000020C8
TimeDateStamp     : 00000000
ForwarderChain    : 00000000
FirstThunk        : 00002090
●--user32.dll
pNameAddr: 00000690
  0000	00000690	MessageBoxA
 
OriginalFirstThunk: 000020D0
TimeDateStamp     : 00000000
ForwarderChain    : 00000000
FirstThunk        : 00002098
●--msvcrt.dll
pNameAddr: 00000698
  0000	00000698	__set_app_type
  0000	0000069C	_controlfp
  0000	000006A0	exit
  0000	000006A4	strstr
  0000	000006A8	_XcptFilter
  0000	000006AC	_exit
  0000	000006B0	_except_handler3
 
OriginalFirstThunk: 000020F0
TimeDateStamp     : 00000000
ForwarderChain    : 00000000
FirstThunk        : 000020B8
●--kernel32.dll
pNameAddr: 000006B8
  0000	000006B8	GetCommandLineA
  0000	000006BC	GetStartupInfoA
  0000	000006C0	GetModuleHandleA
从上面的数据可以看出,输入表的地址是:2040,不过这是虚拟地址,要转换成文件的地址,从节的信息可以看出,输入表在.data节,所以这样计算一下:2040-2000+600=640(其中2000是.data节的起始虚拟地址,600是.data节在文件中的起始地址),这就是输入表在文件中的地址了,我们看一下这个地址下的数据:

输入表的结构大家可以参照我写的另一篇文章:https://bbs.pediy.com/thread-248111.htm
现在的数据来看加一个输入函数是很困难的,因为要将数据整体下移才能挪出空间了,这样要改动的数据就太多了,不过来逆向思维一下,我采取了两个方法来获得空间,首先新增的 IMAGE_IMPORT_DESCRIPTOR结构不往后加,放到现有数据的前面,现在就是 IMAGE_THUNK_DATA32结构还没有空间,我采用的方法是,把 IMAGE_IMPORT_DESCRIPTOR结构中的 OriginalFirstThun清零,这样它指向的数据空间就是放出来了,我们用这部分空间来保存新的输入表,空间都有了,现在就来增加我们需要的输入表。


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最后于 2018-12-3 09:14 被lrtlrt编辑 ,原因:
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感谢分享!
2018-12-3 09:18
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这篇文章在我看来是你之前延续,就不再给精华了,给你个优秀以示鼓励
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xiaohang 这篇文章在我看来是你之前延续,就不再给精华了,给你个优秀以示鼓励
多多指教,
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