BelkaCTF #7: Stranger Dfings

BelkaCTF #7 is over, and the Earth is safe from the extraterrestrial perpetrators (for now!). Thank you for playing, we hope you enjoyed it! Congratulations to the winners:
Student track: LEEJINUNG, k3vg3n, d1v1ne
Professional track: br1g, its5Q, Flip

đź“„ BelkaCTF #7: Stranger Dfings write-up

I called the Chief myself—an idea had struck me.

—Chief, I think I saw some raw radar logs on that ATC dispatcher’s machine!

—So?

—Never mind, I’ll call you back.

Warmup
348		 Radars
Solved 53 times

With the new info, it’s time to go back to the ATC tower terminal and take a closer look.

Mine the ATC software logs for serial numbers of the radars that spotted a UFO flying by.
For example: L123456, M34567890, K234567
Flag:


100 100 175 100 100 100 198 100 100 181 140 658 146 257 319 40 709 494 348 557 774 800 829 50