Reading Your First PCAP Without Losing Your Mind
Packet captures look intimidating, but a handful of filters and a clear methodology will get you to the answer fast.
By Cyber Secret Society Team
A packet capture is just a recording of conversations on the wire. The trick is knowing which conversation matters. Open the file, and before touching anything, look at the Protocol Hierarchy — it tells you what kinds of traffic dominate the capture.
Next, use the Statistics > Conversations view to find the loudest talkers. Beaconing malware often shows up as small, regular connections to a single external host. Data exfiltration shows up as a lopsided byte count heading outbound.
Master a few display filters and you will move ten times faster: `http.request`, `dns`, `ip.addr == x.x.x.x`, and `tcp.flags.syn == 1 && tcp.flags.ack == 0` for connection attempts.
Practise this methodology only on captures you are authorised to analyse — published sample captures and your own lab traffic are good places to start.