CTFs

Arrow

Step 1

Use https://www.aperisolve.com/ and upload the image

Step 2

I noticed this in the Exiftool data. The answer here is x=3. I also noticed this weird string sdvvrug : qrmlq. This could be a ceaser cipher with a shift of 3.

Indeed it is. The password is nojin. So we go back to aperisolve and input the password and we unlocked the file hidden within the image

Step 3

Contents of text file:

The answer to these questions:

1. Which component on the Motherboard generates the most heat? (hint:three letters)
CPU

2. What is the name of the fastest cache on the motherboard?
L1

3. What is the maximum amount of DRAM that a 32-bit system can support?
4GB

4. The LGP CPU is mostly used by which company? (Hint: there are two companies that build CPUs; one of them is the answer!)
Intel

Step 4

One problem… where is the zip file. There is a hint at the bottom ARROW#5141. This is a discord tag. I added him and discovered his github was linked in his profile.

The zip file has a password. But we know it is one of the answers to the questions above. I tried all 4, the correct one was Intel

Contents of the file:

Step 5

The audio file was a DMF corresponding to 445599

I assume this is the password to the hidden file within panda.jpg

Step 6

Its an audio file, so I import it into audacity. Nothing interesting in its waveform, but lets check the spectrogram

Step 7

We have the flag! DOCTF{CompTia_A+}