VolgaCTF Quals 2014 - Reverse 200

Reverse Code Engineering — 200

You just need to put 2 numbers in ascending order without spaces.
btsync: BNBPTYNHZR2FGRLULM5G3XHT4T6XDZK4E
direct link

 You can read my write-up at the Hardc0de team blog.

[Reverse] Simple code deoptimization

In this post I would like to write about code deoptimization strategies and where it may be needed.

First of all there is quite a little use of deoptimization and that is why I haven't found anything about it in the Internet. Usually developer should write the fastest running code that is possible. Therefore if he/she writes very inefficient code that will cause program to delay on simple functions and that developer will be fired or noone will accept such performance.

CSCAMP CTF Quals 2013 - Reverse 150 write-up

In this task we are given a x86-64 binary that prints a string.

CSCAMP CTF Quals 2013 - Reverse 100 write-up

Unfortunately tasks currently are unavailable, so I cannot copy task and its name.

We are given a .NET application (You can verify this using file utility.) which checks password. You can try to guess it, but this won't help you anyhow.

Crackmes [Reverse write-up] - Trojaner's Patch/InjectMe write-up (DLL injection)

Task from crackmes:

Patch or Inject it with a DLL, so that it will show the goodboy message :)
Happy Hacking!

Hacklu CTF 2013 - Reverse 150 - RoboAuth

Task:

Oh boy, those crazy robots can't catch a break! Now they're even stealing our liquid gold from one of our beer tents! And on top of that they lock it behind some authentication system. Quick! Access it before they consume all of our precious beverage!

Download: https://ctf.fluxfingers.net/static/downloads/roboauth/RoboAuth.exe

Flag: password1_password2

Sharif CTF Quals 2013 - Exploiting 200 - sweet

Task:

nc ctf.sharif.edu 15478

Download

This service accepts our input and echoes it using variant of printf function. As you might have already understood there will be a format string vulnerability.