1. Open pcap file in wireshark. 2. Notice the communication between src and destination. Select any packet. 3. Right click > Follow > TCP Stream. 4. Paste data into tcpstr1.txt file. 5. Run `python sol.py`
Original writeup (https://github.com/s-nirali/squarectf-2017/tree/master/sniffed-off-the-wire).