去除程序SEH处理校检

;程 序 名:  RemoveSEHVerification.asm
;功    能:  去掉程序的SEH处理程序的校检
;工作方式:  枚举当前目录下所有的EXE文件,修改SEH相关数据,还算优雅了,没有直接清掉Load Config Table
;作    者:  UPlusPlus
;时    间:  2008/08/08 
    .386
    .model flat,stdcall
      option casemap:none
      include windows.inc
      include kernel32.inc
     include user32.inc
     include uplusplus.inc
     includelib user32.lib
      includelib kernel32.lib
    
      
    .data
    FileFilter db "*.exe",0
    FindData   WIN32_FIND_DATA <>
    CurPath db 256 dup(0)
    hFile dd 0
    hFind dd 0
    PE_head_addr dd 0
    byte_read  dd 0
    Link dw 0808h
    Msg db "Well done",0
    Clr dd 0
         dd 0
    
    PE_head             IMAGE_NT_HEADERS    <0>
    Section_table       db        280h dup (0)  
    
    .code
    start:
    
        invoke GetCurrentDirectory,256,offset CurPath
        invoke FindFirstFile,offset FileFilter,offset FindData
        cmp eax,INVALID_HANDLE_VALUE
        jz FindEnds
        mov hFind,eax
    GoOnFind: 
        invoke CreateFile,offset FindData.cFileName,GENERIC_READ+GENERIC_WRITE,FILE_SHARE_READ+FILE_SHARE_WRITE,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0
        cmp eax,INVALID_HANDLE_VALUE
        jz createfail
        mov hFile,eax
        invoke SetFilePointer,hFile,3ch,0,FILE_BEGIN
        invoke ReadFile,hFile,offset PE_head_addr,4,offset byte_read,0             ;从3ch读PE头地址
        cmp eax,0
        jz readfail
        invoke SetFilePointer,hFile,PE_head_addr,0,FILE_BEGIN                      ;指针移到PE头
        invoke ReadFile,hFile,offset PE_head,sizeof PE_head+sizeof Section_table,offset byte_read,0      ;读出PE头
        
        cmp DWORD  ptr PE_head.Signature,IMAGE_NT_SIGNATURE
        jnz exitwrite
        lea edx,PE_head
        lea edx,(IMAGE_NT_HEADERS ptr [edx]).OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG * sizeof IMAGE_DATA_DIRECTORY]
        mov edx,[edx]
        test edx,edx
        je NoLCT
        
        lea esi,[Section_table]
        @@:
        mov ecx,esi
        mov eax,(IMAGE_SECTION_HEADER ptr [esi]).VirtualAddress
        add esi,sizeof IMAGE_SECTION_HEADER
        cmp edx,eax
        ja @B
        sub edx,(IMAGE_SECTION_HEADER ptr [ecx]).VirtualAddress
        add edx,(IMAGE_SECTION_HEADER ptr [ecx]).PointerToRawData
        lea edx,(IMAGE_LOAD_CONFIG_DIRECTORY32 ptr [edx]).SEHandlerTable
        invoke SetFilePointer,hFile,edx,0,FILE_BEGIN
        invoke WriteFile,hFile,offset Clr,8,offset byte_read,0
NoLCT:
        cmp WORD  ptr PE_head[1ah],0808h            
        jz exitwrite
        mov eax,DWORD  ptr PE_head_addr
        add eax,1ah
        invoke SetFilePointer,hFile,eax,0,FILE_BEGIN
        invoke WriteFile,hFile,offset Link,2,offset byte_read,0
    exitwrite:
    readfail:
         invoke CloseHandle,hFile
    createfail:
        
        invoke FindNextFile,hFind,offset FindData
        test eax,eax
       jnz GoOnFind 
              
        FindEnds:
        invoke FindClose,hFile
        invoke MessageBox,NULL,offset Msg,offset Msg,64
        invoke ExitProcess,0
    end    start    
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