BlockHarbor CTF 2024 Tasks - OSINT
Intro
This September I had a great time playing BlockHarbor Automotive CTF Season 2. This year, the CTF was organized by BlockHarbor & VicOne.
The first round of the comtetition was in jeopardy style. It allowed to team up to 5 people. I played alone in my free time and didn’t solve all the challenges. And after playing, I still decided to publish my writeup, although not full as I initially wanted to. Hope this will be interesting for other organizers, as well as this and next year participants.
This post will describe challenges in the OSINT category. For other tasks, check my other posts.
So, let’s get straight to the challenges!
OSINT category
The first category to solve was OSINT. The tasks go in no particular order.
1 OR 2
What is the make and color of our other vehicle we owned? One is grey.
Write answer in format: bh{color_make}, for example: bh{yellow_cadillac}
Google Images
The task is to find a car owned by BlockHarbor somewhere in the internet. I started from Google Images and searched BlockHarbor string. What I found was mostly grey Ford Mach-O - not our target.
Social Networks
Next step was to check social networks. I started from X (Twitter). Quickly ran through posts and media but didn’t find any suitable car photos. Next I decided to check LinkedIn Images. After some scrolling found the following image:
Red car with Block Harbor logo
To learn the make of the car, I used Google Image Search
Flag
bh{red_ford}
I Know a Lot About Cars
You say you know your cars. Let’s check how well you know them. What is the make and model of this vehicle? 
Unknown car
Write the answer using the following format: Make Model. For example: bh{Volkswagen_Beetle}
Google Images
As in the previous challenge, I used Google Image Search to search by provided image and easily found the answer.
Flag
bh{Lamborghini_Cheetah}
Scanning plates
What country’s license place is this? The answer format is just the country’s name. 
License plate with unknown country of origin
Google Images
Again, I used Google Image Search to search by provided image. But this time I searched only part of the image - the license plate: 
Search by selected image area
Found this link: https://www.olavsplates.com/lithuania.html The link shows exactly the same mark on the license plates issued in Lithuania.
Flag
Lithuania