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[原创]定位FSD(笔记)
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发表于:
2008-6-26 19:15
7253
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小弟菜虫一只 也做一次笔记试试 .内容如题.
定位方法,先从入口DriverEntry开始搜索0xC7 ? 0x58 和0x89 ? 0x58
找到位置后再根据重定位表内信息修正结果
额.大致就是这样吧.
proc __GetFsd
locals
@hMem rd 1
endl
i ExpandEnvironmentStrings,'%WinDir%\system32\drivers\ntfs.sys',esi=strBuffer,strBuffer.size
i ImageLoad,esi,ebx=0
push eax
mov esi,[eax+4*2]
mov [@hMem],esi
mov eax,[esi+0x3C]
add esi,[esi+eax+0x28]
.reloop:
lodsb
cmp al,0xC7
je @F
cmp al,0x89
jne .reloop
@@:
cmp byte[esi+1],0x58 ;IRP_MJ_SET_EA
jne .reloop
lea ebx,[esi+2]
mov esi,[@hMem]
sub ebx,esi
mov eax,[esi+0x3C]
add esi,[esi+eax+0xA0]
@@:
add esi,[esi+4]
mov ecx,ebx
sub ecx,[esi]
cmp ecx,0x1000
ja @B
lodsd
lodsd
mov edx,ebx
and edx,0x0FFF
@@:
lodsw
and eax,0x0FFF
cmp edx,eax
ja @B
je @F
mov dx,word[esi-4]
and dx,0x0FFF
@@:
and ebx,0xFFFFF000
add ebx,edx
add ebx,[@hMem]
mov ebx,[ebx] ;ebx = rva
i ImageUnload,
int3
endp
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