Thermalentry
One of our undercover officers has been following a suspected financial crime kingpin and they
keep visiting a lockup in a secluded area of London - we have no idea what is in there.
A couple of nights ago, the officer noticed that there is a digital PIN pad used to open the lockup
door, and shortly after the suspect entered and closed the door behind them, our officer promtly
approached the PIN pad and took a photograph of the keys with a thermal camera.
Research into the PIN pad reveals that it only accepts four digit codes, so that should make things
easier.
What is the PIN code for the lockup? It will be much easier for us to make a subdued entry to find
out what is in there without compromising our investigation through forcing our way in.
thermalpin.png
Note: You only have 5 attempts so inspect the image very carefully before checking your answer.
Expected flag format: ####
The image:
While I had a gut guess of what the number would be, I figured some extra analysis was what the challenge was about. Reverse searching for the image yielded this article by Kapersky, which noted that the correct order of the digits was 1485. Unfortunately, Kapersky was WRONG! 1458 also failed, so I am pretty disappointed in them right now.
I can't solely place the blame on Kapersky, Red Current published the same wrong answer back in May of 2015, and the original research paper says that that's the legitimate code as well. I'm beginning to think that the CyberSoc guys may have gotten this one wrong!
Going back to my initial hunch that the 4 looks a little warmer than the 1, I got the true answer they were looking for: 4158. I wasn't a big fan of this one, to say the least!