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Category: CTF

CTF/Educational/Tutorials

Cracking an RDP password using Crunch and Hydra

Posted on 9 February 2017 by AukeZwaan / 1 Comment

Lately, I had to crack an RDP password for a known user in an on-site CTF. In this post, I will explain how I solved this challenge.

Crypto/CTF/SECCON 2016 Online CTF/Write-ups

SECCON 2016 Online CTF – Vigenere (100 points)

Posted on 16 December 2016 by AukeZwaan / 0 Comment

As the title of the challenge suggests, we are dealing with a simple Vigenere Cipher here. In Vigenere, each character of the plaintext is shifted using a key. ...

CTF/Pwn/RC3 CTF 2016/Tutorials

RC3 CTF 2016: goodtime (150 points)

Posted on 22 November 2016 by AukeZwaan / 0 Comment

After connecting, a prompt asking for the flag was displayed. After entering an incorrect flag, it would simply return "Nope\n" and quit. What I noticed after s...

CTF/Forensics/RC3 CTF 2016/Write-ups

RC3 CTF 2016: My Lil Droid (100 points)

Posted on 21 November 2016 by AukeZwaan / 0 Comment

First step, of course, is downloading the files. Turned out it was only an apk file called youtube.apk. APKs are just an archive, and can thus be extracted easi...

CTF/RC3 CTF 2016/Web/Write-ups

RC3 CTF 2016: Who’s a Good Boy? (100 points)

Posted on 21 November 2016 by AukeZwaan / 0 Comment

Let's start by having a look at the website at the URL given in the description. Then, I saw that another image was requested through an additional GET request ...

CTF/IceCTF 2016/Write-ups

IceCTF 2016: ChainedIn (75 points)

Posted on 6 October 2016 by AukeZwaan / 0 Comment

After opening the website that was given with the challenge, I was presented a simple-looking website. Of course, I tried to log in with the credentials provide...

CTF/H4CK1T CTF 2016/Write-ups

H4CK1T CTF 2016: China – RTFspy (150 points)

Posted on 3 October 2016 by AukeZwaan / 0 Comment

There is an .rtf file. Considering that the title of this challenge is RTFspy, there must be something in this file. First, of course, I tried to open it in the...

CTF/H4CK1T CTF 2016/Write-ups

H4CK1T CTF 2016: Argentina – r34n1m4710n (100 points)

Posted on 3 October 2016 by AukeZwaan / 0 Comment

Just like I did with Canada – 1n51d3r’5 j0b and Germany – ch17ch47, I started grep'ing. As there was only one file, which was a pcap, I chose to first look for ...

CTF/H4CK1T CTF 2016/Write-ups

H4CK1T CTF: Brazil – p13c3 0f c4k3 (100 points)

Posted on 3 October 2016 by AukeZwaan / 0 Comment

The ZIP archive attached to the challenge contains a ./Docs directory that held several files and directories. First, I looked at all the files to get some idea...

CTF/H4CK1T CTF 2016/Write-ups

H4CK1T CTF 2016: Mozambique – 1magePr1son (150 points)

Posted on 3 October 2016 by AukeZwaan / 0 Comment

The attached ZIP archive contained an image called planet.png. It was a regular-looking image, so let's look for any hidden stuff inside. First, I looked for...

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Recent Posts

  • How we hacked more than 10,000 user accounts at the University of Amsterdam
  • Creating a mobile P2000 receiver using a Raspberry Pi
  • Using a RAT to dump Windows credentials
  • Cracking an RDP password using Crunch and Hydra
  • SECCON 2016 Online CTF – Vigenere (100 points)
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