[转]从内存中加载并运行exe
{配合anskya的AnyWhereFileToPas效果不错}{ ******************************************************* }
{ * 从内存中加载并运行exe * }
{ ******************************************************* }
{ * 参数： }
{ * Buffer: 内存中的exe地址 }
{ * Len: 内存中exe占用长度 }
{ * CmdParam: 命令行参数(不包含exe文件名的剩余命令行参数）}
{ * ProcessId: 返回的进程Id }
{ * 返回值： 如果成功则返回进程的Handle(ProcessHandle), }
{ 如果失败则返回INVALID_HANDLE_VALUE }
{ ******************************************************* }
unit PEUnit;
interface
uses windows;
function MemExecute(const ABuffer; Len: Integer; CmdParam: string; var ProcessId: Cardinal): Cardinal;
implementation
{.$R ExeShell.res} // 外壳程序模板(98下使用)
type
TImageSectionHeaders = array [0..0] of TImageSectionHeader;
PImageSectionHeaders = ^TImageSectionHeaders;
{ 计算对齐后的大小 }
function GetAlignedSize(Origin, Alignment: Cardinal): Cardinal;
begin
result := (Origin + Alignment - 1) div Alignment * Alignment;
end;
{ 计算加载pe并对齐需要占用多少内存，未直接使用OptionalHeader.SizeOfImage作为结果是因为据说有的编译器生成的exe这个值会填0 }
function CalcTotalImageSize(MzH: PImageDosHeader; FileLen: Cardinal; peH: PImageNtHeaders;
peSecH: PImageSectionHeaders): Cardinal;
var
i: Integer;
begin
{计算pe头的大小}
result := GetAlignedSize(PeH.OptionalHeader.SizeOfHeaders, PeH.OptionalHeader.SectionAlignment);
{计算所有节的大小}
for i := 0 to peH.FileHeader.NumberOfSections - 1 do
if peSecH[i].PointerToRawData + peSecH[i].SizeOfRawData > FileLen then // 超出文件范围
begin
result := 0;
exit;
end
else if peSecH[i].VirtualAddress <> 0 then //计算对齐后某节的大小
if peSecH[i].Misc.VirtualSize <> 0 then
result := GetAlignedSize(peSecH[i].VirtualAddress + peSecH[i].Misc.VirtualSize, PeH.OptionalHeader.SectionAlignment)
else
result := GetAlignedSize(peSecH[i].VirtualAddress + peSecH[i].SizeOfRawData, PeH.OptionalHeader.SectionAlignment)
else if peSecH[i].Misc.VirtualSize < peSecH[i].SizeOfRawData then
result := result + GetAlignedSize(peSecH[i].SizeOfRawData, peH.OptionalHeader.SectionAlignment)
else
result := result + GetAlignedSize(peSecH[i].Misc.VirtualSize, PeH.OptionalHeader.SectionAlignment);
end;
{ 加载pe到内存并对齐所有节 }
function AlignPEToMem(const Buf; Len: Integer; var PeH: PImageNtHeaders;
var PeSecH: PImageSectionHeaders; var Mem: Pointer; var ImageSize: Cardinal): Boolean;
var
SrcMz: PImageDosHeader; // DOS头
SrcPeH: PImageNtHeaders; // PE头
SrcPeSecH: PImageSectionHeaders; // 节表
i: Integer;
l: Cardinal;
Pt: Pointer;
begin
result := false;
SrcMz := @Buf;
if Len < sizeof(TImageDosHeader) then exit;
if SrcMz.e_magic <> IMAGE_DOS_SIGNATURE then exit;
if Len < SrcMz._lfanew+Sizeof(TImageNtHeaders) then exit;
SrcPeH := pointer(Integer(SrcMz)+SrcMz._lfanew);
if (SrcPeH.Signature <> IMAGE_NT_SIGNATURE) then exit;
if (SrcPeH.FileHeader.Characteristics and IMAGE_FILE_DLL <> 0) or
(SrcPeH.FileHeader.Characteristics and IMAGE_FILE_EXECUTABLE_IMAGE = 0)
or (SrcPeH.FileHeader.SizeOfOptionalHeader <> SizeOf(TImageOptionalHeader)) then exit;
SrcPeSecH := Pointer(Integer(SrcPeH)+SizeOf(TImageNtHeaders));
ImageSize := CalcTotalImageSize(SrcMz, Len, SrcPeH, SrcPeSecH);
if ImageSize = 0 then
exit;
Mem := VirtualAlloc(nil, ImageSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE); // 分配内存
if Mem <> nil then
begin
// 计算需要复制的PE头字节数
l := SrcPeH.OptionalHeader.SizeOfHeaders;
for i := 0 to SrcPeH.FileHeader.NumberOfSections - 1 do
if (SrcPeSecH[i].PointerToRawData <> 0) and (SrcPeSecH[i].PointerToRawData < l) then
l := SrcPeSecH[i].PointerToRawData;
Move(SrcMz^, Mem^, l);
PeH := Pointer(Integer(Mem) + PImageDosHeader(Mem)._lfanew);
PeSecH := Pointer(Integer(PeH) + sizeof(TImageNtHeaders));
Pt := Pointer(Cardinal(Mem) + GetAlignedSize(PeH.OptionalHeader.SizeOfHeaders, PeH.OptionalHeader.SectionAlignment));
for i := 0 to PeH.FileHeader.NumberOfSections - 1 do
begin
// 定位该节在内存中的位置
if PeSecH[i].VirtualAddress <> 0 then
Pt := Pointer(Cardinal(Mem) + PeSecH[i].VirtualAddress);
if PeSecH[i].SizeOfRawData <> 0 then
begin
// 复制数据到内存
Move(Pointer(Cardinal(SrcMz) + PeSecH[i].PointerToRawData)^, pt^, PeSecH[i].SizeOfRawData);
if peSecH[i].Misc.VirtualSize < peSecH[i].SizeOfRawData then
pt := pointer(Cardinal(pt) + GetAlignedSize(PeSecH[i].SizeOfRawData, PeH.OptionalHeader.SectionAlignment))
else
pt := pointer(Cardinal(pt) + GetAlignedSize(peSecH[i].Misc.VirtualSize, peH.OptionalHeader.SectionAlignment));
// pt 定位到下一节开始位置
end
else
pt := pointer(Cardinal(pt) + GetAlignedSize(PeSecH[i].Misc.VirtualSize, PeH.OptionalHeader.SectionAlignment));
end;
result := True;
end;
end;
type
TVirtualAllocEx = function (hProcess: THandle; lpAddress: Pointer;
dwSize, flAllocationType: DWORD; flProtect: DWORD): Pointer; stdcall;
var
MyVirtualAllocEx: TVirtualAllocEx = nil;
function IsNT: Boolean;
begin
result := Assigned(MyVirtualAllocEx);
end;
{ 生成外壳程序命令行 }
function PrepareShellExe(CmdParam: string; BaseAddr, ImageSize: Cardinal): string;
var
r, h, sz: Cardinal;
p: Pointer;
fid, l: Integer;
buf: Pointer;
peH: PImageNtHeaders;
peSecH: PImageSectionHeaders;
begin
if IsNT then
{ NT 系统下直接使用自身程序作为外壳进程 }
result := ParamStr(0)+CmdParam
else begin
// 由于98系统下无法重新分配外壳进程占用内存,所以必须保证运行的外壳程序能容纳目标进程并且加载地址一致
// 此处使用的方法是从资源中释放出一个事先建立好的外壳程序,然后通过修改其PE头使其运行时能加载到指定地址并至少能容纳目标进程
r := FindResource(HInstance, 'SHELL_EXE', RT_RCDATA);
h := LoadResource(HInstance, r);
p := LockResource(h);
l := SizeOfResource(HInstance, r);
GetMem(Buf, l);
Move(p^, Buf^, l); // 读到内存
FreeResource(h);
peH := Pointer(Integer(Buf) + PImageDosHeader(Buf)._lfanew);
peSecH := Pointer(Integer(peH) + sizeof(TImageNtHeaders));
peH.OptionalHeader.ImageBase := BaseAddr; // 修改PE头重的加载基址
if peH.OptionalHeader.SizeOfImage < ImageSize then // 目标比外壳大,修改外壳程序运行时占用的内存
begin
sz := Imagesize - peH.OptionalHeader.SizeOfImage;
Inc(peH.OptionalHeader.SizeOfImage, sz); // 调整总占用内存数
Inc(peSecH[peH.FileHeader.NumberOfSections-1].Misc.VirtualSize, sz); // 调整最后一节占用内存数
end;
// 生成外壳程序文件名, 为本程序改后缀名得到的
// 由于不想 uses SysUtils (一旦 use 了程序将增大80K左右), 而且偷懒，所以只支持最多运行11个进程，后缀名为.dat, .da0~.da9
result := ParamStr(0);
result := copy(result, 1, length(result) - 4) + '.dat';
r := 0;
while r < 10 do
begin
fid := CreateFile(pchar(result), GENERIC_READ or GENERIC_WRITE, 0, nil, Create_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if fid < 0 then
begin
result := copy(result, 1, length(result)-3)+'da'+Char(r+Byte('0'));
inc(r);
end
else begin
//SetFilePointer(fid, Imagesize, nil, 0);
//SetEndOfFile(fid);
//SetFilePointer(fid, 0, nil, 0);
WriteFile(fid, Buf^, l, h, nil); // 写入文件
CloseHandle(fid);
break;
end;
end;
// result := result + CmdParam; // 生成命令行
result := '"'+result+'"'+CmdParam ;
FreeMem(Buf);
end;
end;
{ 是否包含可重定向列表 }
function HasRelocationTable(peH: PImageNtHeaders): Boolean;
begin
result := (peH.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress <> 0)
and (peH.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].Size <> 0);
end;
type
PImageBaseRelocation= ^TImageBaseRelocation;
TImageBaseRelocation = packed record
VirtualAddress: cardinal;
SizeOfBlock: cardinal;
end;
{ 重定向PE用到的地址 }
procedure DoRelocation(peH: PImageNtHeaders; OldBase, NewBase: Pointer);
var
Delta: Cardinal;
p: PImageBaseRelocation;
pw: PWord;
i: Integer;
begin
Delta := Cardinal(NewBase) - peH.OptionalHeader.ImageBase;
p := pointer(cardinal(OldBase) + peH.OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_BASERELOC].VirtualAddress);
while (p.VirtualAddress + p.SizeOfBlock <> 0) do
begin
pw := pointer(Integer(p) + Sizeof(p^));
for i := 1 to (p.SizeOfBlock - Sizeof(p^)) div 2 do
begin
if pw^ and $F000 = $3000 then
Inc(PCardinal(Cardinal(OldBase) + p.VirtualAddress + (pw^ and $0FFF))^, Delta);
inc(pw);
end;
p := Pointer(pw);
end;
end;
type
TZwUnmapViewOfSection = function (Handle, BaseAdr: Cardinal): Cardinal; stdcall;
{ 卸载原外壳占用内存 }
function UnloadShell(ProcHnd, BaseAddr: Cardinal): Boolean;
var
M: HModule;
ZwUnmapViewOfSection: TZwUnmapViewOfSection;
begin
result := False;
m := LoadLibrary('ntdll.dll');
if m <> 0 then
begin
ZwUnmapViewOfSection := GetProcAddress(m, 'ZwUnmapViewOfSection');
if assigned(ZwUnmapViewOfSection) then
result := (ZwUnmapViewOfSection(ProcHnd, BaseAddr) = 0);
FreeLibrary(m);
end;
end;
{ 创建外壳进程并获取其基址、大小和当前运行状态 }
function CreateChild(Cmd: string; var Ctx: TContext; var ProcHnd, ThrdHnd, ProcId, BaseAddr, ImageSize: Cardinal): Boolean;
var
si: TStartUpInfo;
pi: TProcessInformation;
Old: Cardinal;
MemInfo: TMemoryBasicInformation;
p: Pointer;
begin
FillChar(si, Sizeof(si), 0);
FillChar(pi, SizeOf(pi), 0);
si.cb := sizeof(si);
result := CreateProcess(nil, PChar(Cmd), nil, nil, False, Create_SUSPENDED, nil, nil, si, pi); // 以挂起方式运行进程
if result then
begin
ProcHnd := pi.hProcess;
ThrdHnd := pi.hThread;
ProcId := pi.dwProcessId;
{ 获取外壳进程运行状态，[ctx.Ebx+8]内存处存的是外壳进程的加载基址，ctx.Eax存放有外壳进程的入口地址 }
ctx.ContextFlags := CONTEXT_FULL;
GetThreadContext(ThrdHnd, ctx);
ReadProcessMemory(ProcHnd, Pointer(ctx.Ebx+8), @BaseAddr, SizeOf(Cardinal), Old); // 读取加载基址
p := Pointer(BaseAddr);
{ 计算外壳进程占有的内存 }
while VirtualQueryEx(ProcHnd, p, MemInfo, Sizeof(MemInfo)) <> 0 do
begin
if MemInfo.State = MEM_FREE then
break;
p := Pointer(Cardinal(p) + MemInfo.RegionSize);
end;
ImageSize := Cardinal(p) - Cardinal(BaseAddr);
end;
end;
{ 创建外壳进程并用目标进程替换它然后执行 }
function AttachPE(CmdParam: string; peH: PImageNtHeaders; peSecH: PImageSectionHeaders;
Ptr: Pointer; ImageSize: Cardinal; var ProcId: Cardinal): Cardinal;
var
s: string;
Addr, Size: Cardinal;
ctx: TContext;
Old: Cardinal;
p: Pointer;
Thrd: Cardinal;
begin
result := INVALID_HANDLE_VALUE;
s := PrepareShellExe(CmdParam, peH.OptionalHeader.ImageBase, ImageSize);
if CreateChild(s, ctx, result, Thrd, ProcId, Addr, Size) then
begin
p := nil;
if (peH.OptionalHeader.ImageBase = Addr) and (Size >= ImageSize) then // 外壳进程可以容纳目标进程并且加载地址一致
begin
p := Pointer(Addr);
VirtualProtectEx(result, p, Size, PAGE_EXECUTE_READWRITE, Old);
end
else if IsNT then // 98 下失败
begin
if UnloadShell(result, Addr) then // 卸载外壳进程占有内存
// 重新按目标进程加载基址和大小分配内存
p := MyVirtualAllocEx(Result, Pointer(peH.OptionalHeader.ImageBase), ImageSize, MEM_RESERVE or MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if (p = nil) and hasRelocationTable(peH) then // 分配内存失败并且目标进程支持重定向
begin
// 按任意基址分配内存
p := MyVirtualAllocEx(result, nil, ImageSize, MEM_RESERVE or MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if p <> nil then
DoRelocation(peH, Ptr, p); // 重定向
end;
end;
if p <> nil then
begin
WriteProcessMemory(Result, Pointer(ctx.Ebx+8), @p, Sizeof(DWORD), Old); // 重置目标进程运行环境中的基址
peH.OptionalHeader.ImageBase := Cardinal(p);
if WriteProcessMemory(Result, p, Ptr, ImageSize, Old) then // 复制PE数据到目标进程
begin
ctx.ContextFlags := CONTEXT_FULL;
if Cardinal(p) = Addr then
ctx.Eax := peH.OptionalHeader.ImageBase + peH.OptionalHeader.AddressOfEntryPoint // 重置运行环境中的入口地址
else
ctx.Eax := Cardinal(p) + peH.OptionalHeader.AddressOfEntryPoint;
SetThreadContext(Thrd, ctx); // 更新运行环境
ResumeThread(Thrd); // 执行
CloseHandle(Thrd);
end
else begin // 加载失败,杀掉外壳进程
TerminateProcess(Result, 0);
CloseHandle(Thrd);
CloseHandle(Result);
Result := INVALID_HANDLE_VALUE;
end;
end
else begin // 加载失败,杀掉外壳进程
TerminateProcess(Result, 0);
CloseHandle(Thrd);
CloseHandle(Result);
Result := INVALID_HANDLE_VALUE;
end;
end;
end;
function MemExecute(const ABuffer; Len: Integer; CmdParam: string; var ProcessId: Cardinal): Cardinal;
var
peH: PImageNtHeaders;
peSecH: PImageSectionHeaders;
Ptr: Pointer;
peSz: Cardinal;
begin
result := INVALID_HANDLE_VALUE;
if alignPEToMem(ABuffer, Len, peH, peSecH, Ptr, peSz) then
begin
result := AttachPE(CmdParam, peH, peSecH, Ptr, peSz, ProcessId);
VirtualFree(Ptr, peSz, MEM_DECOMMIT);
//VirtualFree(Ptr, 0, MEM_RELEASE);
end;
end;
initialization
MyVirtualAllocEx := GetProcAddress(GetModuleHandle('Kernel32.dll'), 'VirtualAllocEx');
end.
