deayzl's blog

https://velog.io/@0range1337/CTF-DEF-CON-CTF-Qualifier-2024-pass-it-on-analysis-deep-dive-into-swift-virtual-machine [CTF] DEF CON CTF Qualifier 2024 - pass-it-on analysis : deep dive into swift virtual machineThis challenge is from DEFCON CTF 32 Qualifier (reversing).This post contains my approach of how I tried to solve it and failed before seeing writeup,velog.io

The binary consists of two functions; main and main[cold]. main: int __cdecl main(int argc, const char **argv, const char **envp) { __int64 v3; // rax char *v4; // rdi char *v5; // rdx char *v6; // rax __int64 v7; // rsi __int64 v8; // rcx signed __int64 v9; // rbx signed __int64 v10; // rax size_t v11; // rdx char *v12; // rsi __int64 v13; // rbx int v14; // ebp char v15; // cl int *v16; // rdi..

이름: 안현준대학: 단국대학교 사이버보안학과 23학번나이: 2003년생ctf 팀: cat :flag_kr:취미: 음악 듣기(발라드 제외), linux kernel, v8좋아하는 분야: Pwn, Revgithub: https://github.com/hyeonjun17 Contact:   email: guswns0863@gmail.com   discord: @deayzl Education:   2023.07 ~ 2024.03 , BoB 12th 취약점분석트랙 (top30)History:   2023.08 ~ , ctf team cat :flag_kr:   2023.09 ~ 2023.12, BOB12 project, Linux kernel에서 발생하는 Memory corruption으로 이어지는 Data-ra..

files: encrypt.c, isThisFileUseful.txt, justBinaries.txt, up_down.py isThisFileUseful.txt: 1001010110001010100011001000101110011110100101001001101010000110 justBinaries.txt: 11110100000101010111111101110011111001001101000010001101101101001100101100000111111110100111000110000001100011011111111101000010001101101100010110100100101100111110000111011111111001001000101010010100100011100000010100010010..

#!/usr/bin/env python3 from Crypto.Cipher import ARC4 from base64 import b64encode import zlib from secret import flag, key file = {"flag.txt" : flag, "key" : key} def print_menu(): print("1. List file") print("2. Download file") print("3. Add file") print("4. Copy file") print("5. Remove File") print("6. Logout") def download_file(): filename = input("File name >> ").strip() if filename not in ..

undefined8 main(int param_1,undefined8 *param_2) { undefined8 uVar1; long in_FS_OFFSET; long canary; canary = *(long *)(in_FS_OFFSET + 0x28); if (param_1 == 1) { stdinaddr = stdin; } else { if (param_1 != 2) { printf("Usage: %s []\n",*param_2); /* WARNING: Subroutine does not return */ exit(8); } stdinaddr = fopen((char *)param_2[1],"r"); if (stdinaddr == (FILE *)0x0) { printf("%s: Error: Couldn..