This was the OSINT challenge with the least solves in CTFZone Quals. We were given an email ronaldhamst_xyz@gmail.com and told that there is a mistake somewhere. This is all we had, I tried different combination by substituting different alphabets in the _ place but I got no valid email…

Challenge Name: Rotation We’ve employed a unique technique to encode the message, one that goes beyond the traditional limits of the Caesar cipher. Keep your wits about you and explore every possible avenue — the answer may be closer than you think 0*%pgs8.K*H5K*#3H"N: Use the following combination to get to…

Hello everyone, today I will guide you how to start GEOINT from satellite imagery. For todays writeup, we are taking the following image as a target: Now we want to know what place this exactly is. We look closely in the photograph and make a list of what we see …

Given is the following: John Doe has escaped our high secruity prison again! We managed to intercept an xor key that he uses to send encrypted messages to people! Your aim is to find classified information on his top secret website! Start with the encrypted message - b'\x13\x00\x1d-A*!\x00Q\x16R\x02\x12\x07\n\x1b>\x0e\x06\x1a~O-D CU\t\x0e\x06 E2\n\x17bA#\x0b\t>O\x11\x011O\tH*\x1b\x10-\x08\x00)E\x02\nMck~)\x07"\x01H*+\n_\x01\x00\x00\x00c\n\x00!\x12V\r\x1d4A\x19\x16\x0b"O!N(\x00\x13Dy\x02\x000\x08\rn\x16\x19E\x16,\x0fS\x17H+\x1c\x03N)\nEU1\x0e\x01c\x10\x1b+\x16\x02\x0c\x1d-A\x11\x15\r8\x16H\x0f#\x0e\x0cOx'…

This writeup is all about GEOINT and using landmarks to identify exact locations from merely any video. This is the video location we are going to hunt. Starting off, we have some of the landmarks from the video Here we see a tall white building, which looks like CN…

The approximate source code was given with the challenge. Upon examining the code, we can determine that it is a chatbot powered by ChatGPT. Additionally, we have discovered that any output string containing the term “flag{“ is censored. To proceed, we can interact with the chatbot and request it to…

In this intriguing scenario, we are presented with a set of files containing multiple “guards” that have imposed restrictions on syscalls. Upon careful examination, it becomes evident that the input is divided by a colon (‘:’) using the partition function in the main.py file. It is also worth noting that…

So for this challenge, we were given an instance which asked for our special ticket for every team. Now it asks for a command. After working out with it with lots of fuzzing I found out that it was a bash shell and each letter was mapped like this …

Given: No description, just brains! Download the task file for this challenge. The flag formate is ctfMCS{}. Solution: Given was a text file which contained the following text: Now this seems like Base-64 encoded so we decrypt and get the following result: type latitude longitude name desc T 60.9304322 -108.7207031 Length: 564.3…