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Capture The Flag write-ups

[Kaspersky Industrial CTF 2018] Glardomos Write-up (Reverse587)

Find the flag inside the binary Glardomos.exe Let’s check the file information.

It is a 32-bit .NET executable file. Let’s try to decompile it.

The binary is heavily obfuscated with ConfuserEx v1.0.0. We need to unpack and deobfuscate this… Continue Reading →

[Kaspersky Industrial CTF 2018] Doubles Write-up (Pwn635)

nc doubles.2018.ctf.kaspersky.com 10001 doubles Let’s start with looking at file information and protections.

The file is an 64-bit executable that is dynamically linked and its stack is not executable. Let’s disassemble its main function.

It simply calls a… Continue Reading →

[Kaspersky Industrial CTF 2018] Expression Write-up (Web50)

http://expression.2018.ctf.kaspersky.com/ The website allows us to send two numbers/tokens and an operation among +, -, *, /. Let’s send 1 + 2 to test it.

It calculated the result and gave us a token which is obviously base64 encoded…. Continue Reading →

[P.W.N. CTF 2018] Important Service Write-up (Pwn259)

Very Important Service. Flag in /opt. nc importantservice.uni.hctf.fun 13375 a30577b33492f15d382ef665ee6abda2.tar.xz a30577b33492f15d382ef665ee6abda2.tar.xz MIRROR Let’s look at the file information first.

It is a 64-bit ELF pie executable which is dynamically linked and not stripped. Let’s check its protections.

The… Continue Reading →

[P.W.N. CTF 2018] Kindergarten PWN Write-up (Pwn204)

Thats still kindergarten stuff. Flag in /opt. nc kindergarten.uni.hctf.fun 13373 48800cb1ffbd78f067d68425baa25d88.tar.xz  48800cb1ffbd78f067d68425baa25d88.tar.xz MIRROR Let’s start with looking at the file information.

It is a 64-bit ELF executable which is dynamically linked and not stripped. Let’s take a look at… Continue Reading →

[P.W.N. CTF 2018] BabyPWN Write-up (Pwn115)

This is the babypwn challenge – what are you waiting for student? nc baby.uni.hctf.fun 25251 Binary Libc Binary Mirror Libc Mirror Let’s check the file information first.

It is an 64-bit ELF executable which is dynamically linked and not… Continue Reading →

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