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那么我们首先定义_PEB_LDR_DATA
和_LDR_DATA_TABLE_ENTRY
结构
// LDR链表头
typedef struct _PEB_LDR_DATA
{DWORD Length;bool Initialized;PVOID SsHandle;LIST_ENTRY InLoadOrderModuleList; // 指向了 InLoadOrderModuleList 链表的第一项LIST_ENTRY InMemoryOrderModuleList;LIST_ENTRY InInitializationOrderModuleList;
} PEB_LDR_DATA,*PPEB_LDR_DATA;typedef struct _LDR_DATA_TABLE_ENTRY
{LIST_ENTRY InLoadOrderModuleList;LIST_ENTRY InMemoryOrderModuleList;LIST_ENTRY InInitializationOrderModuleList;void* BaseAddress;void* EntryPoint; ULONG SizeOfImage;UNICODE_STRING FullDllName;UNICODE_STRING BaseDllName;ULONG Flags;SHORT LoadCount;SHORT TlsIndex;HANDLE SectionHandle;ULONG CheckSum;ULONG TimeDateStamp;
} LDR_DATA_TABLE_ENTRY, *PLDR_DATA_TABLE_ENTRY;
然后通过汇编定位到LDR
__asm{mov eax,fs:[0x30] // PEB mov ecx,[eax + 0x0c] // LDRmov ldr,ecx }
因为这里三个双向链表的结构都是一样的,这里就以InLoadOrderModuleList
来进行断链示范,这里要实现断链,最简单的做法就是让Head的Flink和Blink指向它自己
首先通过获取到的ldr结构指向InLoadOrderModuleList
Head = &(ldr->InLoadOrderModuleList);
然后通过CONTAINING_RECORD
这个宏返回结构体基址
Cur = Head->Flink;
ldte = CONTAINING_RECORD( Cur, LDR_DATA_TABLE_ENTRY, InInitializationOrderModuleLi
void CONTAINING_RECORD(address,type,field
);
进行断链操作
ldte->InInitializationOrderModuleList.Blink->Flink = ldte->InInitializationOrderModuleList.Flink; ldte->InInitializationOrderModuleList.Flink->Blink = ldte->InInitializationOrderModuleList.Blink;
然后将指针指向下一个结构
Cur = Cur->Flink;
因为需要遍历链表进行断链指向自身的操作,这里就需要写一个循环进行断链,完整代码如下
// killPEB.cpp : Defines the entry point for the console application.
//#include "stdafx.h"
#include <Windows.h>typedef struct _UNICODE_STRING {USHORT Length;USHORT MaximumLength;PWSTR Buffer;
} UNICODE_STRING, *PUNICODE_STRING;typedef struct _PEB_LDR_DATA
{DWORD Length;bool Initialized;PVOID SsHandle;LIST_ENTRY InLoadOrderModuleList;LIST_ENTRY InMemoryOrderModuleList;LIST_ENTRY InInitializationOrderModuleList;
} PEB_LDR_DATA,*PPEB_LDR_DATA;// LDR表项,存储了模块信息
typedef struct _LDR_DATA_TABLE_ENTRY
{LIST_ENTRY InLoadOrderModuleList;LIST_ENTRY InMemoryOrderModuleList;LIST_ENTRY InInitializationOrderModuleList;void* BaseAddress;void* EntryPoint; ULONG SizeOfImage;UNICODE_STRING FullDllName;UNICODE_STRING BaseDllName;ULONG Flags;SHORT LoadCount;SHORT TlsIndex;HANDLE SectionHandle;ULONG CheckSum;ULONG TimeDateStamp;
} LDR_DATA_TABLE_ENTRY, *PLDR_DATA_TABLE_ENTRY;void HideModule(HMODULE hModule)
{ PPEB_LDR_DATA ldr; PLDR_DATA_TABLE_ENTRY ldte;__asm{mov eax,fs:[0x30] mov ecx,[eax + 0x0c] mov ldr,ecx }PLIST_ENTRY Head, Cur; Head = &(ldr->InLoadOrderModuleList);Cur = Head->Flink;do{ldte = CONTAINING_RECORD( Cur, LDR_DATA_TABLE_ENTRY, InLoadOrderModuleList);if (ldte->BaseAddress == hModule){ ldte->InLoadOrderModuleList.Blink->Flink = ldte->InLoadOrderModuleList.Flink; ldte->InLoadOrderModuleList.Flink->Blink = ldte->InLoadOrderModuleList.Blink; }Cur = Cur->Flink;} while(Head != Cur);Head = &(ldr->InMemoryOrderModuleList);Cur = Head->Flink;do { ldte = CONTAINING_RECORD( Cur, LDR_DATA_TABLE_ENTRY, InMemoryOrderModuleList); if (ldte->BaseAddress == hModule){ldte->InMemoryOrderModuleList.Blink->Flink = ldte->InMemoryOrderModuleList.Flink; ldte->InMemoryOrderModuleList.Flink->Blink = ldte->InMemoryOrderModuleList.Blink; }Cur = Cur->Flink;} while(Head != Cur);Head = &(ldr->InInitializationOrderModuleList);Cur = Head->Flink;do { ldte = CONTAINING_RECORD( Cur, LDR_DATA_TABLE_ENTRY, InInitializationOrderModuleList); if (ldte->BaseAddress == hModule){ldte->InInitializationOrderModuleList.Blink->Flink = ldte->InInitializationOrderModuleList.Flink; ldte->InInitializationOrderModuleList.Flink->Blink = ldte->InInitializationOrderModuleList.Blink; }Cur = Cur->Flink;} while(Head != Cur);
}int main(int argc, CHAR* argv[])
{printf("点任意按键开始断链");getchar();HideModule(GetModuleHandleA("kernel32.dll"));printf("断链成功\n");getchar();return 0;
}
这里在没有开始断链的时候可以看到是由3个模块的
锻炼之后可以发现kerner32.dll
已经被隐藏
如果要实现所有模块的隐藏,直接将模块判断的代码删除即可
void HideModule_All()
{ PPEB_LDR_DATA ldr; PLDR_DATA_TABLE_ENTRY ldte;// 获取LDR__asm{mov eax,fs:[0x30] mov ecx,[eax + 0x0c] mov ldr,ecx }PLIST_ENTRY Head; Head = &(ldr->InLoadOrderModuleList);Head->Flink = Head->Blink = Head;Head = &(ldr->InMemoryOrderModuleList);Head->Flink = Head->Blink = Head;Head = &(ldr->InInitializationOrderModuleList);Head->Flink = Head->Blink = Head;
}
实现效果如下
断链之后,模块已经全部看不到了
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