How to block an dll injection via Minifilter

Im trying to block .dll injection (or general injection) into a specific process via a Minifilter

This is my PreOperationCallback:

    if (Data->Iopb->MajorFunction == IRP_MJ_ACQUIRE_FOR_SECTION_SYNCHRONIZATION) {        /* Open file for writing/appending? */        if ((Data->Iopb->Parameters.Create.SecurityContext->DesiredAccess & PAGE_EXECUTE) == PAGE_EXECUTE) {            if (security) {                DbgPrint("[ miniFilter ] [IRP_MJ_ACQUIRE_FOR_SECTION_SYNCHRONIZATION] [ Blocked ]\n");                Data->IoStatus.Status = STATUS_ACCESS_DENIED;                return FLT_PREOP_COMPLETE;            }        }        if ((Data->Iopb->Parameters.Create.SecurityContext->DesiredAccess & FILE_EXECUTE) == FILE_EXECUTE) {            if (security) {                DbgPrint("[ miniFilter ] [IRP_MJ_ACQUIRE_FOR_SECTION_SYNCHRONIZATION] [ Blocked ]\n");                Data->IoStatus.Status = STATUS_ACCESS_DENIED;                return FLT_PREOP_COMPLETE;            }        }    }}

According to other Forums IRP_MJ_ACQUIRE_FOR_SECTION_SYNCHRONIZATION will be called on DLL Injection!I have also tried "IRP_MJ_CREATE" but then I am also blocking any execution of .exe files. Filtering the file extension could be easily bypassed...

I hope somebody knows more about it ;)