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How can I detect if running DLL module is valid system DLL?

Posted on 2009-07-09
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Last Modified: 2012-05-07
Hello,
I'm using a code for detecting running modules which is getting the list from peb. I want to seperate system dlls and other dlls like malwares,viruses etc.
Is there a way to detect it with some way? I give a sample for detecting some net cafe dll detecting with my code.
Regards,
Justin Uberti

char szakinsoftDLLs[][100] = {
	"cplushook.dll",
	"cafeplusfiltrehook.dll"
};
bool in_akinsoft (char *aranan) {
	for(int i = 0; i < 2; i++) {
		if(strnistr(aranan,szakinsoftDLLs[i]) != NULL){
			return true;
		}
	}
	return false;
}
int anti_load()
{
	DWORD pPEB = GetPEB ();
	DWORD PEB_LDR_DATA = (unsigned long)*(DWORD*)(pPEB+0x0C);
	DWORD InLoadOrderModuleListHead = (unsigned long)*(DWORD*)(PEB_LDR_DATA+0x0C);
	DWORD ModuleFileName;
	while (*(DWORD*)(InLoadOrderModuleListHead) != (unsigned long)*(PDWORD*)(PEB_LDR_DATA+0x0C) && (!AC_STATUSX))
	{
		ModuleFileName = (unsigned long)*(PDWORD*)(InLoadOrderModuleListHead+0x28);
		InLoadOrderModuleListHead = *(DWORD*)(InLoadOrderModuleListHead);
		int a = 255;
		char *ansistr = new char[a];
		WideCharToMultiByte(CP_ACP,0,(LPCWSTR)(const unsigned short *)ModuleFileName,-1,ansistr,a,NULL,NULL);
	//	_strlwr(ansistr);
		if (in_akinsoft(ansistr)) {
			*(PVOID *)((unsigned long)*(PDWORD*)(PEB_LDR_DATA+0x0C) + 0x1C) = NULL;
			HMODULE BaseAddress = *(HMODULE *)((unsigned long)*(PDWORD*)(PEB_LDR_DATA+0x0C)+0x18);
			FreeLibrary(BaseAddress);
		}
		free(ansistr);
	}
	return 0;
}
bool

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Question by:juberti
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by:itsmeandnobodyelse
ID: 24814289
>>>> Is there a way to detect it with some way?
You would need to check the dll/exe file for known virus/malware signatures or use heuristical methods to find out whether the code is somewhat suspicious. Unfortunately the names of dlls will not always give an evidence as a virus mostly will be covered by another name. 'system dlls' are services started by the Service Control Manager (SCM) at boot time (or manually later). It can be malware as well if they were installed by some bot or worm.
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Author Comment

by:juberti
ID: 24828322
Thanks for your comment, so there is no way to detect it :(
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itsmeandnobodyelse earned 500 total points
ID: 24830042
>>>>  so there is no way to detect it :(

One way is to try to find the dll/exe behind the process, then call antivirus (or explorer plug-in of antivirus) to check that file.
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