February 2012
Intermediate to advanced
800 pages
23h 55m
English
Content preview from Practical Malware AnalysisBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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A Full Hello World Example
Example 19-6 shows a full implementation of the findSymbolByHash function that can be used to find exported symbols in
loaded DLLs.
Example 19-6. findSymbolByHash implementation
; __stdcall DWORD findSymbolByHash(DWORD dllBase, DWORD symHash);
findSymbolByHash:
pushad
mov ebp, [esp + 0x24] ; load 1st arg: dllBase
mov eax, [ebp + 0x3c] ❶ ; get offset to PE signature
; load edx w/ DataDirectories array: assumes PE32
mov edx, [ebp + eax + 4+20+96] ❷
add edx, ebp ; edx:= addr IMAGE_EXPORT_DIRECTORY
mov ecx, [edx + 0x18] ❸ ; ecx:= NumberOfNames mov ebx, [edx + 0x20] ; ebx:= RVA of AddressOfNames add ebx, ebp ; rva->va .search_loop: jecxz .error_done ; if at end of array, jmp to done dec ecx ; dec loop counter ; esi:= next name, ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.