Rating: 5.0
I opened the file in WireShark and looked through the contents. Most of the contents were encrypted TLS1.3, which are not easy to decrypt. I decided to check available files from HTTP, and there was something suspicious. I extracted html file and opened it in the browser. Press the button and get the flag!
##### Flag: sdctf{G3T_F*cK3d_W1r3SHaRK}