PicoCTF - Bbbbloat

Challenge

Tags

PicoCTF 2022 / Reverse Engineering / binary /obfuscation

Writeup

1. Download the file.
2. We can use file command to check its type.

   
    file bbbbloat
    #bbbbloat: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=99c5c1ce06be240322c15bcabc3cd90318eb2003, for GNU/Linux 3.2.0, stripped
   
   

3. Use IDA analysis its pseudocode. (View > Open subviews > Generate pseudocode)
4. Execute file and answer 549255.