diff --git a/Malware/Malware/Debug + argument/Malware.lastbuildstate b/Malware/Malware/Debug + argument/Malware.lastbuildstate index f4b5fea..22b7188 100644 --- a/Malware/Malware/Debug + argument/Malware.lastbuildstate +++ b/Malware/Malware/Debug + argument/Malware.lastbuildstate @@ -1,2 +1,2 @@ #v4.0:v100 -Debug + argument|Win32|Z:\Malware\| +Debug + argument|Win32|Z:\malware-m2-2026\Malware\| diff --git a/Malware/Malware/Malware.cpp b/Malware/Malware/Malware.cpp index 42ce435..89c1ff8 100644 --- a/Malware/Malware/Malware.cpp +++ b/Malware/Malware/Malware.cpp @@ -12,100 +12,441 @@ #include #endif +// Macros d'obfuscation pour cacher les "Magic Numbers" +#define POLY ((uint8_t)(0xAA ^ 0xB1)) // 170 ^ 177 = 27 = 0x1B +#define MSB ((uint8_t)(0x40 << 1)) // 64 << 1 = 128 = 0x80 +#define SHIFT ((uint8_t)(14 >> 1)) // 14 / 2 = 7 + +// Constantes d'états pour le Control Flow Flattening +#define STATE_INIT (0xAA ^ 0x11) // 0xBB +#define STATE_KEY_DERIV (0xCC ^ 0x22) // 0xEE +#define STATE_DECRYPT (0x77 ^ 0x44) // 0x33 +#define STATE_HASH (0x88 ^ 0x11) // 0x99 +#define STATE_EXIT (0xDE ^ 0xAD) // 0x73 + +#define M_INIT (0xFA ^ 0xAF) // 0x55 +#define M_EXPAND (0xDE ^ 0x9A) // 0x44 +#define M_ORACLE (0xCC ^ 0xFF) // 0x33 +#define M_DECOY (0x88 ^ 0xEE) // 0x66 +#define M_EXEC (0x11 ^ 0x88) // 0x99 +#define M_TRAP (0x55 ^ 0xFF) // 0xAA +#define M_EXIT (0xDE ^ 0xAD) // 0x73 + /* ============================================================================== * MATHÉMATIQUES SUR LE CORPS DE GALOIS GF(2^8) * Polynôme irréductible standard (AES) : x^8 + x^4 + x^3 + x + 1 (0x1B) * ============================================================================== */ -// Multiplication dans GF(256) : a * b mod 0x1B -uint8_t gf_mul(uint8_t a, uint8_t b) { - uint8_t p = 0; - for (int i = 0; i < 8; i++) { - if (b & 1) - p ^= a; - uint8_t hi_bit = a & 0x80; - a <<= 1; - if (hi_bit) - a ^= 0x1B; - b >>= 1; +typedef struct { + uint32_t fake_entropy; + uint8_t a; + uint8_t mask; + uint16_t padding; + uint8_t b; + uint8_t p; + uint8_t junk; +} GF_CONTEXT; + +typedef struct { + uint8_t input_x; + uint8_t* p_coeffs; + uint8_t final_result; + uint8_t current_x_pow; + uint32_t junk_data; + uint32_t state; // On l'intègre ici pour le flux + GF_CONTEXT inner_ctx; +} POLY_CONTEXT; + +typedef struct { + char* hidden_buffer; // Le pointeur qui remplace le "return useful;" + uint32_t chaos_seed; // Pour le générateur de lag + uint32_t opaque_counter; // Variable de contrôle bidon +} RED_HERRING_CTX; + +typedef struct { + char* input_decoded; // L'argument entrant + int final_match_result; // Le retour sortant + + unsigned char computed_hash[32]; // Buffer interne + uint32_t chaos_state; // Pour le générateur de lag +} HASH_CTX; + +uint8_t gf_mul(GF_CONTEXT* ctx, uint8_t key_stream) { + ctx->p = 0; + + //Sert à rien + ctx->junk = key_stream ^ 0x33; + + //Itération 1 + ctx->mask = -(ctx->b & 1); + ctx->p = (ctx->p | (ctx->a & ctx->mask)) - (ctx->p & (ctx->a & ctx->mask)); + ctx->mask = -((ctx->a & MSB) >> SHIFT); + ctx->a <<= 1; + ctx->a ^= (POLY & ctx->mask); + ctx->b >>= 1; + + //Sert à rien (condition impossible) + if (((ctx->junk * ctx->junk) + ctx->junk) % 2 != 0) { + ctx->p ^= ctx->fake_entropy; // Code mort + ctx->b = ctx->a / (ctx->junk - ctx->junk); } - return p; + + //Itération 2 + ctx->mask = -(ctx->b % 2); + ctx->p ^= (ctx->a & ctx->mask); + ctx->mask = -((ctx->a & (256 / 2)) / 128); + ctx->a = (ctx->a ^ ctx->a) + 2 * (ctx->a & ctx->a); + + //Sert à rien : x ^ key_stream ^ key_stream == x + ctx->a = ((ctx->a ^ key_stream) | (POLY & ctx->mask)) - ((ctx->a ^ key_stream) & (POLY & ctx->mask)); + ctx->a ^= key_stream; // Rétablissement invisible + ctx->b = ctx->b / 2; + + //Itération 3 + ctx->mask = -(ctx->b & 1); + ctx->p ^= (ctx->a & ctx->mask); + ctx->mask = -((ctx->a & MSB) >> (21 / 3)); + ctx->a = ctx->a + ctx->a; + ctx->a ^= ((54 / 2) & ctx->mask); + ctx->b >>= 1; + + //Sert à rien : condition impossible + if (ctx->b > 255) { + ctx->a ^= ctx->p; + return 0x00; + } + + //Itération 4 + ctx->p = (ctx->p | (ctx->a & (-(ctx->b & 1)))) - (ctx->p & (ctx->a & (-(ctx->b & 1)))); + ctx->mask = -((ctx->a >> SHIFT) & 1); + ctx->a <<= 1; + ctx->a ^= (POLY & ctx->mask); + ctx->b >>= 1; + + //Itération 5 + ctx->mask = -(ctx->b % 2); + ctx->p ^= (ctx->a & ctx->mask); + ctx->mask = -((ctx->a & MSB) / 128); + ctx->a = ctx->a * 2; + ctx->a ^= (POLY & ctx->mask); + ctx->b = ctx->b / 2; + + //Itération 6 + ctx->mask = -(ctx->b & 1); + ctx->p ^= (ctx->a & ctx->mask); + ctx->mask = -((ctx->a & 128) >> SHIFT); + ctx->a = ctx->a + ctx->a; + ctx->a = (ctx->a | (POLY & ctx->mask)) - (ctx->a & (POLY & ctx->mask)); + ctx->b >>= 1; + + //Itération 7 + ctx->fake_entropy = ctx->p ^ ctx->a; //Sert à rien + ctx->p ^= (ctx->a & (-(ctx->b % 2))); + ctx->mask = -((ctx->a >> SHIFT) & 1); + ctx->a <<= 1; + ctx->a ^= ((0xFF ^ 0xE4) & ctx->mask); + ctx->b = ctx->b / 2; + + //Itération 8 + ctx->mask = -(ctx->b & 1); + ctx->p = (ctx->p | (ctx->a & ctx->mask)) - (ctx->p & (ctx->a & ctx->mask)); + ctx->mask = -((ctx->a & MSB) >> SHIFT); + ctx->a = ctx->a * 2; + ctx->a ^= (POLY & ctx->mask); + + return ctx->p; } +/* // Évaluation d'un polynôme de degré 7 sur GF(256) uint8_t evaluate_polynomial(uint8_t x, const uint8_t coeffs[8]) { uint8_t result = 0; uint8_t x_pow = 1; for (int j = 0; j < 8; j++) { - result ^= gf_mul(coeffs[j], x_pow); - x_pow = gf_mul(x_pow, x); + GF_CONTEXT ctx; + ctx.a = coeffs[j]; + ctx.b = x_pow; + result ^= gf_mul(&ctx, 0x55); + ctx.a = x_pow; + ctx.b = x; + x_pow = gf_mul(&ctx, 0xAA); } return result; +}*/ + +void evaluate_polynomial(POLY_CONTEXT* pctx) { + pctx->final_result = (pctx->input_x & (~pctx->input_x)); + pctx->current_x_pow = (uint8_t)((0xDE >> 7) | (0x01 & 0x01)); + pctx->junk_data = 0x1337BEEF; + + + uint32_t j = 0; + pctx->state = 0xDEAD6666; // Point d'entrée + + while (pctx->state != 0xBAADF00D) { + switch (pctx->state) { + case 0xDEAD6666: // BLOC : Calcul du terme (coeff * x^j) + { + pctx->inner_ctx.a = pctx->p_coeffs[j]; + pctx->inner_ctx.b = pctx->current_x_pow; + + uint8_t m_term = gf_mul(&(pctx->inner_ctx), 0x55); + pctx->final_result = (pctx->final_result | m_term) - (pctx->final_result & m_term); + + pctx->state = 0xFEED1111; + break; + } + + case 0xFEED1111: // BLOC : x_pow = x_pow * x + { + pctx->inner_ctx.a = pctx->current_x_pow; + pctx->inner_ctx.b = pctx->input_x; + + pctx->current_x_pow = gf_mul(&(pctx->inner_ctx), 0xAA); + + //Condition toujours vraie + if (((pctx->junk_data * (pctx->junk_data + 1)) + 1) % 2 != 0) { + pctx->state = 0xCAFE2222; // Chemin normal + } else { + pctx->state = 0x00000000; // Branche morte + } + break; + } + + case 0xCAFE2222: // BLOC : Incrémentation & Boucle + { + j = -~j; + // On compare j à 8 (0x40 >> 3) + if (j < (0x80 >> 4)) { + pctx->state = 0xDEAD6666; // Reboucle + } else { + pctx->state = 0xBAADF00D; // Sortie + } + + pctx->junk_data ^= (j << 13) | (pctx->final_result); + break; + } + + default: + // Anti-debug / Anti-tamper : si le state est corrompu + pctx->state = 0xBAADF00D; + break; + } + } } typedef struct { - char *(*p1)(); - int (*p2)(char *decoded); + void (*p1)(RED_HERRING_CTX* pctx); + void (*p2)(HASH_CTX* pctx); } FuncList; -char *this_is_useful_fr_dont_miss_it() { // it's not, pure red herring - char *useful = (char *)malloc(sizeof(char) * 100); - for (int i = 0; i < 99; i++) { - useful[i] ^= useful[i + 1] + 'c'; +// Fausse piste ultime - Draine le temps de l'analyste (VAGUE 3) +void this_is_useful_fr_dont_miss_it(RED_HERRING_CTX* pctx) { + uint32_t magic_size = (0xFF ^ 0x9B); + pctx->chaos_seed = 0xC0DEF00D; + + pctx->opaque_counter = (magic_size * 2) - 200; + + pctx->hidden_buffer = (char*)malloc( (magic_size | 0x00) + pctx->opaque_counter ); + + if (pctx->hidden_buffer == NULL) return; // Sécurité basique + + // Générateur de Lag & Boucle poubelle + // Boucle qui tourne dans le vide pour exploser le Graphe de Flux de Contrôle + for (int lag = 0; lag < ((0x64 ^ 0x07) & 0x3F); lag++) { + pctx->chaos_seed += (lag ^ 0xAA); + pctx->chaos_seed = (pctx->chaos_seed << 3) | (pctx->chaos_seed >> 29); // ROR 29 } - return useful; + + for (uint32_t j = 0; j < (magic_size - (0xFF / 0xFF)); j++) { + + // Entrelacement : on met à jour le chaos au milieu des calculs "utiles" + pctx->chaos_seed ^= pctx->hidden_buffer[j]; + + uint8_t constant_c = (0xC6 >> 1); + uint8_t next_val = pctx->hidden_buffer[j + 1]; + uint8_t current_val = pctx->hidden_buffer[j]; + + //x + y = (x ^ y) + 2*(x & y) + uint8_t added_val = (next_val ^ constant_c) + ((next_val & constant_c) << 1); + + //Sert à rien : condition impossible + if (((pctx->chaos_seed * pctx->chaos_seed) + pctx->chaos_seed) % 2 != 0) { + pctx->hidden_buffer[j] = pctx->opaque_counter & 0xFF; + pctx->chaos_seed /= pctx->opaque_counter; + } + pctx->hidden_buffer[j] = (current_val | added_val) & ~(current_val & added_val); //x ^ y = (x | y) & ~(x & y) + } + + // Pas de return ! Le résultat est discrètement caché dans pctx->hidden_buffer } -int cmp_hash(char *decoded) { - unsigned char hash[32] = {0xf4, 0xed, 0x2a, 0x38, 0xd2, 0xff, 0xcc, 0x38, - 0xbc, 0x63, 0x28, 0x46, 0xaf, 0xe2, 0x4f, 0x34, - 0x2d, 0xd8, 0xb8, 0x5e, 0x74, 0xbd, 0x73, 0x99, - 0x2d, 0x91, 0x56, 0x24, 0xb4, 0x73, 0x5d, 0xee}; - unsigned char hash_computed[32]; - lonesha256(hash_computed, (unsigned char *)decoded, sizeof(char) * 57); - for (int i = 0; i < 32; i++) { - if (hash[i] != hash_computed[i]) { - return hash[i] - hash_computed[i]; +// Comparaison de Hash SHA-256 (VAGUES 1, 2 & 3 COMBINÉES) +void cmp_hash(HASH_CTX* pctx) { + + uint32_t len_57 = (0xFF ^ 0xC6); + uint32_t len_32 = (0x80 >> 2); + + pctx->chaos_state = 0xDEADBEEF; + pctx->final_match_result = 0; + + lonesha256(pctx->computed_hash, (unsigned char*)pctx->input_decoded, len_57); + + //(XOR Key = 0x55) + const unsigned char obfuscated_target[32] = { + 0xA1, 0xB8, 0x7F, 0x6D, 0x87, 0xAA, 0x99, 0x6D, + 0xE9, 0x36, 0x7D, 0x13, 0xFA, 0xB7, 0x1A, 0x61, + 0x78, 0x8D, 0xED, 0x0B, 0x21, 0xE8, 0x26, 0xCC, + 0x78, 0xC4, 0x03, 0x71, 0xE1, 0x26, 0x08, 0xBB + }; + + for (uint32_t i = 0; i < len_32; i++) { + + // Générateur de Lag + for(uint32_t lag = 0; lag < ((i & 0x03) + 2); lag++) { + pctx->chaos_state ^= (lag << (i % 4)); + } + + // Déchiffrement à la volée du vrai byte ciblé + uint8_t real_target_byte = obfuscated_target[i] ^ 0x55; + uint8_t current_computed = pctx->computed_hash[i]; + + uint8_t is_different = (real_target_byte ^ current_computed); + + if (is_different != 0) { + + //Condition toujours vraie + if (((pctx->chaos_state * pctx->chaos_state) + pctx->chaos_state) % 2 == 0) { + // Vrai calcul : on simule le (hash[i] - hash_computed[i]) + // x - y = (x + (~y) + 1) + pctx->final_match_result = real_target_byte + (~current_computed) + 1; + return; // On sort discrètement, le résultat est dans pctx + + } else { + // Branche morte + pctx->final_match_result = 0xFF; + pctx->chaos_state /= (is_different - is_different); // Division par zéro + } + } + // Entrelacement de bruit + pctx->chaos_state = (pctx->chaos_state >> 3) | (pctx->chaos_state << 29); + } +} + +int fakemain(int argc, wchar_t *argv[]) { + // Vérifie si argc < 2 + if ((((argc << 1) - argc) | 0) <= (0xFF / 0xFF)) { + return (0xBAD & 0); + } + + // Initialisation de la machine à états + uint32_t current_state = STATE_INIT; + uint32_t junk_register = 0; + + // Déclarations remontées pour le switch + Obfuscated_stdFunclist *stdfunclist = nullptr; + FuncList list = {this_is_useful_fr_dont_miss_it, cmp_hash}; + char *encoded = nullptr; + char *key = nullptr; + RED_HERRING_CTX fake_context; + HASH_CTX my_hash_ctx; + + //Aplatissement du flux de contrôle + while (current_state != STATE_EXIT) { + switch (current_state) { + + case STATE_INIT: + { + stdfunclist = new Obfuscated_stdFunclist(); + + // Le payload. L'analyste le verra, mais ne saura pas quand il est utilisé. + encoded = "\x64\x55\x56\x41\x43\x14\x56\x13\x46\x5b\x47\x40\x14\x5e\x52" + "\x47\x13\x56\x5e\x5d\x40\x1f\x13\x53\x54\x14\x42\x5b\x41\x40" + "\x13\x53\x47\x58\x5d\x46\x14\x53\x51\x54\x5b\x5b\x52\x54\x41" + "\x51\x12\x54\x51\x13\x44\x47\x46\x5a\x5d\x54"; + + key = (char *)malloc(sizeof(char) * (0x12 >> 1)); + + list.p1(&fake_context); + + // Calcul du prochain état avec un MBA + current_state = STATE_KEY_DERIV; + break; + } + + case STATE_KEY_DERIV: + { + uint8_t dummy_mask = (fake_context.chaos_seed == (junk_register & 0)) ? 1 : 0; + + //Limite de 8 caractères + int limit = (0x40 >> 3); + + for (int i = 0; argv[1][i] != L'\0' && i < limit; ++i) { + // Masquage du XOR avec le buffer poubelle + key[i] = (char)argv[1][i] ^ (fake_context.hidden_buffer[i] * dummy_mask); + junk_register += key[i]; + } + + key[(0x10 >> 1)] = '\0'; + + current_state = STATE_DECRYPT; + break; + } + + case STATE_DECRYPT: + { + encrypt_decrypt(key, encoded); + +#ifdef _WIN32 + DWORD old; + VirtualProtect((LPVOID)list.p1, (1 << 8), (0x80 >> 1), &old); + + junk_register ^= old; // Utilisation de old pour éviter qu'il soit optimisé +#endif + current_state = STATE_HASH; + break; + } + + case STATE_HASH: + { + my_hash_ctx.input_decoded = encoded; + + list.p2(&my_hash_ctx); + + // Si final_match_result == 0, alors (0 | 0) == 0. + if ((my_hash_ctx.final_match_result | 0) == 0) { + // On affiche le flag avec le printf obfusqué + stdfunclist->obfusc_printf("%s\n", encoded); + } + + // Sortie du labyrinthe + current_state = STATE_EXIT; + break; + } + + default: + // Anti-tampering : si l'analyste modifie la mémoire et casse l'état + current_state = STATE_EXIT; + break; } } - return 0; + + // Le retour utilise la variable poubelle annulée (0) + return (junk_register - junk_register); } -// Fake main -int fakemain(int argc, wchar_t *argv[]) { - Obfuscated_stdFunclist *stdfunclist = new Obfuscated_stdFunclist(); +typedef struct { + void (*evaluate_polynomial)(POLY_CONTEXT* pctx) ; + //uint8_t (*evaluate_polynomial)(uint8_t x, const uint8_t coeffs[8]); + void *(*memcpy)(void *__restrict __dest, const void *__restrict __src, + size_t __n); + int (*lonesha256)(unsigned char out[32], const unsigned char *in, + size_t len); +} FuncList2; - FuncList list = {this_is_useful_fr_dont_miss_it, cmp_hash}; - // char* encoded = "Salut a tous les amis, gg pour avoir dechiffre ce - // string"; - char *encoded = - "\x64\x55\x56\x41\x43\x14\x56\x13\x46\x5b\x47\x40\x14\x5e\x52" - "\x47\x13\x56\x5e\x5d\x40\x1f\x13\x53\x54\x14\x42\x5b\x41\x40" - "\x13\x53\x47\x58\x5d\x46\x14\x53\x51\x54\x5b\x5b\x52\x54\x41" - "\x51\x12\x54\x51\x13\x44\x47\x46\x5a\x5d\x54"; - char *key = (char *)malloc(sizeof(char) * 9); - for (int i = 0; argv[1][i] != '\0'; ++i) { - key[i] = (char)argv[1][i] ^ this_is_useful_fr_dont_miss_it()[i] ^ - list.p1()[i]; // xors to argv[1][i] - } - key[8] = '\0'; - // printf("Key: %s\n", key); - encrypt_decrypt(key, encoded); -#ifdef _WIN32 - DWORD old; - VirtualProtect(&list.p1, 0x100, PAGE_EXECUTE_READWRITE, &old); -#endif - if (!list.p2(encoded)) { // cmp_hash - stdfunclist->obfusc_printf("%s", encoded); - } - return 0; -} - -/* ============================================================================== - * MOTEUR D'OBFUSCATION BRANCHLESS (POINT-FUNCTION OBFUSCATION) - * ============================================================================== - */ +// Identité de Boole pour M_EXIT (toujours 0x73) +#define GET_EXIT_STATE(x) (((x | 0x73) & 0x7F) ^ (x & 0)) void fake_exit(char* msg){ printf("%s\n",msg); @@ -130,157 +471,127 @@ bool verif_checksum_prog(){ return memcmp(hash, hash, 32) == 0; } -typedef struct { - uint8_t (*evaluate_polynomial)(uint8_t x, const uint8_t coeffs[8]); - void *(*memcpy)(void *__restrict __dest, const void *__restrict __src, - size_t __n); - int (*lonesha256)(unsigned char out[32], const unsigned char *in, - size_t len); -} FuncList2; int main(int argc, char *argv[]) { - if (argc < 2 || strlen(argv[1]) > 8) { - printf("Arguments invalides.\n"); - return 1; - } + if (((uint64_t)argc * argc + 1) == 0) return 0xDEAD; - // Init des struct d'obfuscation d'appel de fonction - Obfuscated_stdFunclist *stdfunclist = new Obfuscated_stdFunclist(); - FuncList2 list = {evaluate_polynomial, stdfunclist->obfusc_memcpy, lonesha256}; + uint32_t selector = M_INIT; + Obfuscated_stdFunclist *stdfunclist = nullptr; + FuncList2 list; + uint8_t input[8] = {0}; + uint8_t super_bloc[64] = {0}; + unsigned char h1[32], h2[32], h_leurre[32]; + uint64_t mask = 0; - fakemain(argc, (wchar_t **)argv); bool valid = verif_checksum_prog(); if(!valid){ fake_exit(argv[1]); } + + while (selector != M_EXIT) { + switch (selector) { - uint8_t input[8]; - list.memcpy(input, argv[1], 8); + case M_INIT: { + stdfunclist = new Obfuscated_stdFunclist(); + list.evaluate_polynomial = evaluate_polynomial; + list.memcpy = stdfunclist->obfusc_memcpy; + list.lonesha256 = lonesha256; - /* -------------------------------------------------------------------------- - * 1. EXPANSION SPATIALE (FORWARD-COMPUTATION) - * Objectif : Projeter l'entrée (8 octets) sur un espace pseudo-aléatoire de - * 64 octets (512 bits) pour remplir parfaitement un bloc de compression - * SHA-256 sans ajout de bits de padding prévisibles. - * - * Équation de récurrence non-linéaire : - * S_{c, i+1} = P_{c, i}(S_{c, i} \oplus x_i) - * où: - * - c : Index de la chaîne d'évaluation parallèle (de 0 à 7). - * - i : Index du caractère de l'entrée en cours de traitement (de 0 - * à 7). - * - S_{c, i} : État interne de la chaîne 'c' à l'étape 'i'. - * - x_i : i-ème octet (caractère) de l'entrée fournie. - * - P_{c, i} : Polynôme de transition aléatoire sur GF(2^8) spécifique à - * cette étape. - * -------------------------------------------------------------------------- - */ + fakemain(argc, (wchar_t **)argv); + + size_t sz = 0; + while(argv[1][sz] != '\0' && sz < 9) sz++; + if (sz > 8) return 0; - uint8_t super_bloc[64]; - for (int c = 0; c < 8; c++) { - uint8_t state = INITIAL_STATES[c]; - for (int i = 0; i < 8; i++) { - // Mélange non-linéaire du caractère d'entrée avec l'état courant - state = - list.evaluate_polynomial(state ^ input[i], POLY_COEFFS[c][i]); - // Capture de la trace pour former le bloc final - super_bloc[c * 8 + i] = state; + list.memcpy(input, argv[1], sz); + + selector = (selector ^ 0x11); + break; + } + + case M_EXPAND: { + for (uint32_t c = 0; c < (0x40 >> 3); c++) { + uint8_t current_state = INITIAL_STATES[c]; + for (uint32_t i = 0; i < 8; i++) { + POLY_CONTEXT mctx; + mctx.input_x = (current_state | input[i]) - (current_state & input[i]); + mctx.p_coeffs = (uint8_t*)POLY_COEFFS[c][i]; + list.evaluate_polynomial(&mctx); + + current_state = mctx.final_result; + super_bloc[(c << 3) | i] = current_state; + } + } + selector = M_ORACLE; + break; + } + + case M_ORACLE: { + list.lonesha256(h1, super_bloc, 64); + uint32_t diff = 0; + for (int i = 0; i < 32; i++) { + diff |= (h1[i] ^ h_cible[i]); + } + + uint64_t d64 = diff; + mask = ((d64 | (~d64 + 1)) >> 63) - 1; + + selector = M_DECOY; + break; + } + + case M_DECOY: { + //"Microsoft..." déchiffré à la volée + unsigned char leurre[29]; + unsigned char enc_l[] = {0x7E, 0x5A, 0x50, 0x41, 0x5C, 0x40, 0x5C, 0x55, 0x47, 0x6C, 0x70, 0x61, 0x67, 0x6C, 0x7A, 0x5D, 0x5A, 0x47, 0x5A, 0x52, 0x5F, 0x5A, 0x49, 0x52, 0x47, 0x5A, 0x5C, 0x5D, 0x00}; + for(int k=0; k<28; k++) leurre[k] = enc_l[k] ^ 0x33; + + list.lonesha256(h_leurre, leurre, 28); + + unsigned char b2[74]; + list.memcpy(b2, super_bloc, 64); + + //"DERIVATION" déchiffré à la volée + unsigned char d_str[11]; + unsigned char enc_d[] = {0x11, 0x10, 0x07, 0x1C, 0x03, 0x14, 0x01, 0x1C, 0x1A, 0x1B, 0x00}; + for(int k=0; k<10; k++) d_str[k] = enc_d[k] ^ 0x55; + + list.memcpy(b2 + 64, d_str, 10); + list.lonesha256(h2, b2, 74); + + selector = M_EXEC; + break; + } + + case M_EXEC: { + for (int i = 0; i < 8; i++) { + uint8_t d = (enc_delta[i] ^ h2[i]) & (mask & 0xFF); + payload[i] ^= (h_leurre[i] ^ d); + } + payload[7] = (uint8_t)(0); + + stdfunclist->obfusc_printf((char *)payload, argv[1]); + + selector = M_TRAP; + break; + } + + case M_TRAP: { + // DEADLOCK MATHÉMATIQUE + // Un carré parfait + 1 n'est jamais nul sur les entiers non-signés 32 bits + uint32_t trap_sync = 1; + while ((trap_sync * trap_sync) + 1 != 0) { + trap_sync++; + if (trap_sync == 0) break; // Sécurité physique + } + selector = GET_EXIT_STATE(selector); + break; + } + + default: + selector = M_EXIT; + break; } } - - /* -------------------------------------------------------------------------- - * 2. VÉRIFICATION D'INTÉGRITÉ (ORACLE ALÉATOIRE) - * Calcul de l'empreinte H1 = SHA256(super_bloc) - * -------------------------------------------------------------------------- - */ - unsigned char h1[32]; - list.lonesha256(h1, super_bloc, 64); - - // Accumulation des erreurs bit-à-bit par rapport à la cible cryptographique - // Diff = \bigvee_{k=0}^{31} (H_1[k] ^ H_{cible}[k]) - uint32_t diff = 0; - for (int i = 0; i < 32; i++) { - diff |= (h1[i] ^ h_cible[i]); - } - - /* -------------------------------------------------------------------------- - * 3. FILTRE MATHÉMATIQUE "BRANCHLESS" (ZÉRO CONDITION) - * Transforme l'erreur accumulée en un masque binaire absolu. - * Formule : Mask = ( (Diff | (~Diff + 1)) >> 63 ) - 1 - * -------------------------------------------------------------------------- - */ - - uint64_t diff64 = diff; - - // Si diff > 0 (mot de passe faux) -> is_wrong = 1 - // Si diff == 0 (mot de passe bon) -> is_wrong = 0 - uint64_t is_wrong = (diff64 | (~diff64 + 1)) >> 63; - - // Si is_wrong == 1 -> Mask = 0x0000000000000000 (Ferme la porte au payload) - // Si is_wrong == 0 -> Mask = 0xFFFFFFFFFFFFFFFF (Ouvre la porte au payload) - uint64_t mask = is_wrong - 1; - - /* -------------------------------------------------------------------------- - * 4. DÉRIVATION DE LA CLÉ DE LEURRE (COMPORTEMENT GOODWARE) - * K_G = SHA256(L)_{[0..7]} où L est une chaîne d'apparence inoffensive. - * Permet une indistinguabilité totale lors d'une analyse statique - * (strings). - * -------------------------------------------------------------------------- - */ - unsigned char leurre[] = "Microsoft_CRT_Initialization"; - unsigned char h_leurre[32]; - list.lonesha256(h_leurre, leurre, - 28); // K_G correspond aux 8 premiers octets - - /* -------------------------------------------------------------------------- - * 5. SÉPARATION DES DOMAINES (DOMAIN SEPARATION) - * Calcul de l'empreinte de dérivation H2. - * H_2 = SHA256(super_bloc \parallel \text{"DERIVATION"}) - * Garantit l'indépendance mathématique entre la vérification (H1) et le - * déchiffrement (H2). - * -------------------------------------------------------------------------- - */ - - unsigned char buffer_h2[74]; // 64 octets (SB) + 10 octets (Sel) - list.memcpy(buffer_h2, super_bloc, 64); - list.memcpy(buffer_h2 + 64, "DERIVATION", 10); - - unsigned char h2[32]; - list.lonesha256(h2, buffer_h2, 74); - - /* -------------------------------------------------------------------------- - * 6. RÉSOLUTION ALGÉBRIQUE ET DÉCHIFFREMENT - * Formule maîtresse : K_{finale} = K_G ^ ( (E_\Delta ^ H_2) \ \& \ Mask ) - * - Si Mask == 0x00 : K_{finale} = K_G ^ 0 = K_G (Goodware) - * - Si Mask == 0xFF : K_{finale} = K_G ^ \Delta = K_G ^ (K_M ^ K_G) = K_M - * (Malware) - * -------------------------------------------------------------------------- - */ - unsigned char derived_key[8]; - for (int i = 0; i < 8; i++) { - // Tentative de déchiffrement du secret (\Delta) - uint8_t computed_delta = enc_delta[i] ^ h2[i]; - - // Application du masque d'annihilation (filtre AND) - uint8_t applied_delta = computed_delta & (mask & 0xFF); - - // Recombinaison finale de la clé - derived_key[i] = h_leurre[i] ^ applied_delta; - - // Déchiffrement immédiat in-place du payload - payload[i] ^= derived_key[i]; - } - payload[7] = '\0'; // Protection d'affichage C-String - - /* -------------------------------------------------------------------------- - * 7. EXÉCUTION DU PAYLOAD DÉCHIFFRÉ - * -------------------------------------------------------------------------- - */ - stdfunclist->obfusc_printf((char *)payload, argv[1]); - - // Boucle infinie demandée pour suspendre le processus - while (1) { - } - return 0; } \ No newline at end of file diff --git a/Malware/Malware/functions.cpp b/Malware/Malware/functions.cpp index ea733a5..aee90b6 100644 --- a/Malware/Malware/functions.cpp +++ b/Malware/Malware/functions.cpp @@ -16,7 +16,7 @@ bool verify_signature(unsigned char* signature, unsigned char* starting_loc){ void print_signature(unsigned char* loc){\ printf("{"); - for(int i = 0; i < 12; i++){ + for(int i = 0; i < 5; i++){ printf("0x%x",loc[i]); if (i != 11) printf(", "); } diff --git a/Malware/Malware/functions.h b/Malware/Malware/functions.h index efebae9..608e135 100644 --- a/Malware/Malware/functions.h +++ b/Malware/Malware/functions.h @@ -15,9 +15,10 @@ class Obfuscated_stdFunclist { private: void find_obfusc_printf() { // print_signature(printf) - unsigned char signature_printf[12] = {0x8b, 0xff, 0x55, 0x8b, + /*unsigned char signature_printf[12] = {0x8b, 0xff, 0x55, 0x8b, 0xec, 0x6a, 0xfe, 0x68, - 0xe0, 0xdb, 0x34, 0x10}; + 0xe0, 0xdb, 0x34, 0x10};*/ + unsigned char signature_printf[12] = { 0x6A, 0x0C, 0x68, 0x60, 0x57, 0xB0, 0x78, 0xE8, 0xC0, 0xB5, 0xFA, 0xFF }; unsigned char *loc = (unsigned char *)ungetc; // after printf in memory while (!verify_signature(signature_printf, loc)) { loc--; // go back until we find printf @@ -26,22 +27,25 @@ class Obfuscated_stdFunclist { } void find_obfusc_malloc() { // print_signature((unsigned char*)malloc); - unsigned char signature_malloc[12] = {0x8b, 0xff, 0x55, 0x8b, + /*unsigned char signature_malloc[12] = {0x8b, 0xff, 0x55, 0x8b, 0xec, 0x51, 0x6a, 0x0, - 0x6a, 0x0, 0x6a, 0x1}; + 0x6a, 0x0, 0x6a, 0x1};*/ + unsigned char signature_malloc[12] = { 0x8B, 0xFF, 0x55, 0x8B, 0xEC, 0x53, 0x8B, 0x5D, 0x08, 0x83, 0xFB, 0xE0 }; unsigned char *loc = (unsigned char *)free; // after malloc in memory while (!verify_signature(signature_malloc, loc)) { - loc--; // go backwards until we find malloc + loc++; // go backwards until we find malloc } obfusc_malloc = (void *(*)(size_t __size))loc; } void find_obfusc_memcpy() { auto a = memcpy; // sinon ça crash parce que memcpy est pas chargé en mémoire :c + /* unsigned char signature_memcpy[12] = {0xe9, 0xdf, 0x39, 0x0, 0x0, 0xe9, - 0x20, 0x58, 0x0, 0x0, 0xe9, 0xb}; - unsigned char *loc = (unsigned char *)memset; // after memcpy in memory + 0x20, 0x58, 0x0, 0x0, 0xe9, 0xb};*/ + unsigned char signature_memcpy[12] = { 0x55, 0x8B, 0xEC, 0x57, 0x56, 0x8B, 0x75, 0x0C, 0x8B, 0x4D, 0x10, 0x8B }; + unsigned char *loc = (unsigned char *)memset; // before memcpy in memory while (!verify_signature(signature_memcpy, loc)) { - loc++; // go backwards until we find memcpy + loc--; // go forwards until we find memcpy } obfusc_memcpy = (void *(*)(void *__restrict __dest, const void *__restrict __src,