./dr3dd

  • Matrix of Hell

    Securinets-CTF-2019(Matrix of Hell, 992 pt) An ELF stripped binary is provided. On running binary, it asked for a password which we have to find. It is more like crackme’s problems. So i opened it in my ida to do some static analysis. Renamed variables for easy understanding. There are main...

  • AES-CBC bit flipping Attack

    n00b19CTF(Easy-Flipp, 100 pt) This is simple crypto challenge created by me. At the time of CTF, this challenge had zero solved. So, I thought to write a writeup for beginners to understand how CBC bit flipping works. AES-CBC Encryption and Decryption flow chart The main vulnerable part of CBC is...

  • Simple Shellcode Injection

    TUCTF18(Shelleasy, 345 pt) In this challange we have to overwrite variable to 0xdeadbeef and after that inject 32 bit shellcode to stack thats it. STEP-1 Binary protection and file type : dr3dd@dr3dd-Aspire-F5-573G  ~/ctf-2018/TUctf18/shelleasy  file shella-easy shella-easy: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked, interpreter...