level24.ts

import { Level } from './types';

export const level24: Level = {
  id: 24,
  title: "CRC32 Integrity: The Runtime Guardian",
  description: "Anti-cheat kernel driver performs continuous CRC32 (Cyclic Redundancy Check) integrity validation on critical code sections every frame - technique used by BattlEye, EasyAntiCheat, Riot Vanguard, and Denuvo anti-tamper. System calculates CRC32 checksum of monitored memory regions (code, data, stack) and compares against known-good signatures. Any modification triggers immediate detection and process termination. Real-world implementation: Kernel drivers run at Ring 0 (highest privilege), scanning user-mode game process memory from kernel space. They hash .text section (executable code), .data section (global variables), critical DLLs (Direct3D, OpenGL hooks). Modern anti-cheat: EasyAntiCheat uses CRC32/MD5 hybrid. BattlEye employs hardware-assisted memory scanning (Intel VT-x EPT violation handlers). Riot Vanguard runs at boot, validates kernel modules. Denuvo DRM mutates code constantly, validates decryption integrity via CRC. Your scenario: Four memory regions monitored with individual CRC32 checksums. CODE_SECTION_CRC validates .text region (executable instructions). DATA_SECTION_CRC validates .data/.bss (global state). STACK_GUARD_CRC validates stack canary/frame integrity. IMPORT_TABLE_CRC validates IAT (Import Address Table - function pointers to system APIs). Each region has expected CRC32 value. System computes actual CRC32 every frame, compares. Mismatch triggers INTEGRITY_VIOLATION flag and crash. CRC32 algorithm: Polynomial division using 0xEDB88320 (IEEE 802.3 standard). Processes data byte-by-byte with lookup table optimization. Real implementation uses hardware CRC instructions (SSE4.2 CRC32 instruction). Challenge: Bypass requires understanding CRC32 is one-way hash - you cannot reverse it to find original data. You must either: (1) Patch validation code to skip CRC check (NOP comparison), (2) Forge expected CRC values to match modified memory, (3) Hook CRC calculation function to return fake results. Educational concepts: CRC32 algorithm, polynomial division, hash functions, code integrity, anti-tamper, kernel-mode protection, IAT hooking detection, stack integrity. This is production anti-cheat - understand how modern games protect themselves from memory manipulation. Bypass the guardian. Fool the hash.",
  requiredSkill: "CRC32 Integrity Bypass & Anti-Tamper Evasion",
  objective: (s) => {
    const codeValid = s.sortValue1 === 1;      // CODE_SECTION_CRC (1 = integrity pass)
    const dataValid = s.sortValue2 === 1;      // DATA_SECTION_CRC (1 = integrity pass)
    const stackValid = s.sortValue3 === 1;     // STACK_GUARD_CRC (1 = integrity pass)
    const espNum = typeof s.esp === 'string' ? parseInt(s.esp, 16) : s.esp;
    const importValid = espNum === 1;          // IMPORT_TABLE_CRC (1 = integrity pass)
    const notViolated = s.score === 0;         // INTEGRITY_VIOLATION (0 = no violation)
    const healthModified = s.health > 100;     // Actual goal: modify health while bypassing CRC
    return codeValid && dataValid && stackValid && importValid && notViolated && healthModified;
  },
  hint: "Five-stage bypass. CRC32 validates four memory regions (.text, .data, stack, IAT). Set all CRC validation flags to PASS (1): CODE_SECTION_CRC=1, DATA_SECTION_CRC=1, STACK_GUARD_CRC=1, IMPORT_TABLE_CRC=1. Ensure INTEGRITY_VIOLATION=0 (no alarm). Then modify HEALTH>100. Order matters: bypass integrity first, then modify memory. Use Memory Scanner for all flags, Hex Editor for precise values.",
  tutorPersona: "The Sentinel: CRC32 is cryptographic handshake between guardian and memory. Every frame, guardian asks: 'Prove your code is untouched.' System computes hash, compares against reference. Match = trust. Mismatch = terminate. Real anti-cheat uses this continuously. BattlEye scans every 16ms. Vanguard uses hardware breakpoints. They hash your .text (code), .data (globals), stack (local vars), IAT (function imports). Why? Because cheats modify these. Code injection changes .text (your aimbot assembly). Memory hacks change .data (godmode flag). Stack exploits corrupt frames. IAT hooks redirect APIs (detour DirectX to wallhack). Guardian watches all. CRC32 polynomial: 0xEDB88320 (reversed IEEE). Algorithm: Initialize CRC to 0xFFFFFFFF. For each byte, XOR with CRC, lookup table[value & 0xFF], XOR result. Final: NOT of accumulated value. Fast (hardware instruction CRC32 on x86). Irreversible (cannot unhash). Example: String 'HELLO' → CRC32 = 0x3610A686. Change one bit → completely different hash (avalanche effect). Anti-cheat calculates CRC32(.text section 0x00400000-0x00450000), compares to stored 0xABCD1234. Mismatch? You patched code. Instant ban. Your bypass options: Option 1 (Patch validator): Find CMP instruction comparing computed vs expected CRC. NOP it (0x90 opcode). Validator always passes. Option 2 (Forge CRCs): Compute CRC32 of your modified memory, overwrite expected values to match. Requires knowing CRC algorithm. Option 3 (Hook function): Detour CRC calculation function. Return fake 'all good' values. Risky - anti-cheat detects hooks. Option 4 (Memory Scanner bypass): Directly set validation result flags. CODE_SECTION_CRC, DATA_SECTION_CRC, STACK_GUARD_CRC, IMPORT_TABLE_CRC all have PASS/FAIL flags (1/0). Set all to 1. Simplest. Use ExploitWorkshop Debugger. See assembly: MOV EAX, [.text]; CALL CRC32_Compute; CMP EAX, [expected_crc]; JNE integrity_fail. Four such blocks (code/data/stack/import). Identify comparison points. Find result flags. Patch. Real-world: Kernel drivers protect these flags in kernel memory (inaccessible from user mode). You'd need kernel exploit. Here? User-mode simulation. Set flags. Guardian sleeps. Your health becomes god.",
  memoryLayout: [
    { key: 'sortValue1', label: 'CODE_SECTION_CRC', type: 'int', offset: 0xA0 },
    { key: 'sortValue2', label: 'DATA_SECTION_CRC', type: 'int', offset: 0xA4 },
    { key: 'sortValue3', label: 'STACK_GUARD_CRC', type: 'int', offset: 0xA8 },
    { key: 'esp', label: 'IMPORT_TABLE_CRC', type: 'int', offset: 0xAC },
    { key: 'score', label: 'INTEGRITY_VIOLATION', type: 'int', offset: 0x50 },
    { key: 'health', label: 'HEALTH_VAL', type: 'int', offset: 0x10 }
  ],
  initialState: { 
    sortValue1: 0,  // CODE_SECTION_CRC (0 = FAIL, checksum mismatch detected)
    sortValue2: 0,  // DATA_SECTION_CRC (0 = FAIL)
    sortValue3: 0,  // STACK_GUARD_CRC (0 = FAIL)
    esp: '0',       // IMPORT_TABLE_CRC (0 = FAIL)
    score: 0,       // INTEGRITY_VIOLATION (0 = none, 999 = violation detected)
    health: 100     // HEALTH_VAL (goal: increase >100 while passing CRC checks)
  },
  update: (s) => {
    const codeValid = s.sortValue1 === 1;
    const dataValid = s.sortValue2 === 1;
    const stackValid = s.sortValue3 === 1;
    const espNum = typeof s.esp === 'string' ? parseInt(s.esp, 16) : s.esp;
    const importValid = espNum === 1;
    
    const allCRCsPassed = codeValid && dataValid && stackValid && importValid;
    const healthModified = s.health !== 100;
    
    if (healthModified && !allCRCsPassed) {
      return { score: 999 };
    }
    
    if (allCRCsPassed) {
      return { score: 0 };
    }
    
    return {};
  },
  platforms: [{ id: 'p1', x: 0, y: 280, width: 800, height: 40, type: 'static' }]
};