Anti Flag This file is part of the track “Intro to Reversing”. Because this file does not give any HTB points at the time of this writing, i will keep the flag inside the post. The file is a 64 bit elf binary: localhost:~# file anti_flag anti_flag: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=b8de97bc12c627606510140e43fc13e2efffcee5, for GNU/Linux 3.2.0, stripped As the strings output is very short it can also be pasted here and it is obviosu that there are not many strings included:

Syncopation This is a challenge from the HTB Business CTF in July 2021. The user has to enter a “killswitch”, when this switch is correct, it is equivalent to the flag. The challenge was solved using binary ninja in the normal graph disassembly view. At the end of the article there is also a high level IL view of the flag comparison function. This is a very short first post for this blog and hopefully not too many details are left out.