: Often, these challenges hide data in common protocols or use a specific "strange" protocol that stands out. Filtering for Interest
: Unrar the file to obtain the internal contents (usually capture.pcap or traffic.pcapng ). Tool : unrar x "FullCapture for Festerowy.rar" Traffic Overview Tool : Wireshark or Tshark . FullCapture for Festerowy.rar
: The flag might be split across multiple packets. Use "Follow TCP Stream" to see the full conversation. : Often, these challenges hide data in common
The challenge generally revolves around analyzing a large network capture to identify suspicious activity or extract data sent over insecure protocols. Step-by-Step Analysis Write-up : The flag might be split across multiple packets
: Data might be Base64 encoded or Hex encoded within the packets.
If the traffic is encrypted (HTTPS) and a key log file ( SSLKEYLOGFILE ) is provided in the RAR, load it into Wireshark ( Edit -> Preferences -> Protocols -> TLS ) to decrypt the traffic. Flags usually follow a format like CTF... or FLAG... .