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Bot: added library cleanup to findByHash()

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This commit is contained in:
CPunch 2022-07-07 23:38:03 -05:00
parent b2f8efc402
commit f92bbbc85b
1 changed files with 10 additions and 4 deletions
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14
bot/win/winobf.c
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@ -72,6 +72,8 @@ uint32_t getHashName(LPCSTR cszName)
return u32Hash; return u32Hash;
} }
/* fork of the resolve_find() with the weird struct stripped. also library cleanup for the fail
condition was added */
void *findByHash(LPCWSTR module, uint32_t hash) void *findByHash(LPCWSTR module, uint32_t hash)
{ {
HMODULE hLibrary; HMODULE hLibrary;
@ -87,18 +89,18 @@ void *findByHash(LPCWSTR module, uint32_t hash)
/* grab DOS headers & verify */ /* grab DOS headers & verify */
pDOSHdr = (PIMAGE_DOS_HEADER)hLibrary; pDOSHdr = (PIMAGE_DOS_HEADER)hLibrary;
if (pDOSHdr->e_magic != IMAGE_DOS_SIGNATURE) if (pDOSHdr->e_magic != IMAGE_DOS_SIGNATURE)
return NULL; goto _findByHashFail;
/* grab NT headers & verify */ /* grab NT headers & verify */
pNTHdr = (PIMAGE_NT_HEADERS)RESOLVE_REL_CALC(hLibrary, pDOSHdr->e_lfanew); pNTHdr = (PIMAGE_NT_HEADERS)RESOLVE_REL_CALC(hLibrary, pDOSHdr->e_lfanew);
if (pNTHdr->Signature != IMAGE_NT_SIGNATURE) if (pNTHdr->Signature != IMAGE_NT_SIGNATURE)
return NULL; goto _findByHashFail;
/* verify that this NT file is a DLL & actually exports functions */ /* verify that this NT file is a DLL & actually exports functions */
if ((pNTHdr->FileHeader.Characteristics & IMAGE_FILE_DLL) == 0 || if ((pNTHdr->FileHeader.Characteristics & IMAGE_FILE_DLL) == 0 ||
pNTHdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress == 0 || pNTHdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress == 0 ||
pNTHdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].Size == 0) pNTHdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].Size == 0)
return NULL; goto _findByHashFail;
pIED = (PIMAGE_EXPORT_DIRECTORY)RESOLVE_REL_CALC( pIED = (PIMAGE_EXPORT_DIRECTORY)RESOLVE_REL_CALC(
hLibrary, hLibrary,
@ -111,10 +113,14 @@ void *findByHash(LPCWSTR module, uint32_t hash)
/* walk library export table, compare hashes until we find a match */ /* walk library export table, compare hashes until we find a match */
for (DWORD i = 0; i < pIED->AddressOfFunctions; i++) { for (DWORD i = 0; i < pIED->AddressOfFunctions; i++) {
if (getHashName((LPCSTR)RESOLVE_REL_CALC(hLibrary, pdwNames[i])) == hash) if (getHashName((LPCSTR)RESOLVE_REL_CALC(hLibrary, pdwNames[i])) == hash)
/* return the pointer to our function. we don't worry about closing the library's
handle because we'll need it loaded until we exit. */
return (void *)RESOLVE_REL_CALC(hLibrary, pdwAddress[pwOrd[i]]); return (void *)RESOLVE_REL_CALC(hLibrary, pdwAddress[pwOrd[i]]);
} }
/* function name was not found */ _findByHashFail:
/* function was not found, close the library handle since we don't need it anymore */
CloseHandle(hLibrary);
return NULL; return NULL;
} }