核态获取PsLoadedModuleList地址的稳定方法

转载: https://blog.csdn.net/celestialwy/article/details/1261407

    PsLoadedModuleList是Windows加载的所有内核模块构成的链表的表头，利用它可以枚举所有这些模块的信息，这些信息可用在AntiRootkit等方面。
    由于Windows 2003 Server SP1开始不再支持用户态访问Physical Memory，所以我这介绍一种在内核态获取PsLoadedModuleList地址的稳定方法。次方法已在Windows XP SP2和Windows 2003 SP1下测试通过。
    代码如下：

typedef struct _LDR_DATA_TABLE_ENTRY {
    LIST_ENTRY InLoadOrderLinks;
    LIST_ENTRY InMemoryOrderLinks;
    LIST_ENTRY InInitializationOrderLinks;
    PVOID DllBase;
    PVOID EntryPoint;
    ULONG SizeOfImage;
    UNICODE_STRING FullDllName;
    UNICODE_STRING BaseDllName;
    ULONG Flags;
    USHORT LoadCount;
    USHORT TlsIndex;
    union {
        LIST_ENTRY HashLinks;
        struct {
            PVOID SectionPointer;
            ULONG CheckSum;
        };
    };
    union {
        struct {
            ULONG TimeDateStamp;
        };
        struct {
            PVOID LoadedImports;
        };
    };
} LDR_DATA_TABLE_ENTRY, *PLDR_DATA_TABLE_ENTRY;

extern PLIST_ENTRY g_PsLoadedModuleList   ;
PLIST_ENTRY FindPsLoadedModuleList (IN PDRIVER_OBJECT DriverObject)
{
    PLDR_DATA_TABLE_ENTRY pModuleCurrent = NULL;
    PLDR_DATA_TABLE_ENTRY PsLoadedModuleList = NULL;

if (DriverObject == NULL)
        return 0;

pModuleCurrent = *((PLDR_DATA_TABLE_ENTRY*)(DriverObject->DriverSection));
    if (pModuleCurrent == NULL)
        return 0;

PsLoadedModuleList = pModuleCurrent;

while ((PLDR_DATA_TABLE_ENTRY)pModuleCurrent->InLoadOrderLinks.Flink != PsLoadedModuleList)
    {

if (((pModuleCurrent->SizeOfImage == 0x00000000)
              && (pModuleCurrent->FullDllName.Length == 0))
              || (pModuleCurrent->FullDllName.Buffer == NULL))
        {
            return (PLIST_ENTRY) pModuleCurrent;
        }

pModuleCurrent = (PLDR_DATA_TABLE_ENTRY)pModuleCurrent->InLoadOrderLinks.Flink;
    }

return NULL;
}

我在测试中发现了这样一个有趣的现象，在Windows 2003 Server SP1下PsLoadedModuleList满足((pModuleCurrent->SizeOfImage == 0x00000000)&& (pModuleCurrent->FullDllName.Length == 0))而在WindowXP SP2下PsLoadedModuleList满足(pModuleCurrent->FullDllName.Buffer == NULL)。

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