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Analyzing Network Packets with Scapy

Lets an agent read packet captures, dissect protocols, and flag suspicious traffic patterns using Scapy.

Source Download skill
Repository
mukul975/Anthropic-Cybersecurity-Skills
Stars
35,430
Licence
Apache-2.0
Files
3 files

What it does

Once installed, the agent can work with network traffic recordings (pcap files) using the Scapy Python library. It can summarize which hosts and protocols appear, count TCP flags to spot possible SYN floods, check DNS queries for signs of tunneling, and export the findings as a JSON report. It can also help craft custom test packets, but only for authorized testing. The included script parses a capture file and extracts per-packet details such as IPs, ports, TTL, and flags.

Great for

  • Security analysts reviewing a packet capture from an incident or lab exercise
  • Students learning protocol-level traffic analysis
  • Penetration testers documenting findings during an authorized engagement

Skip it if

  • Monitoring or intercepting traffic on networks you do not own or have written permission to test, since packet sniffing and crafting can be illegal or harmful without authorization
  • Production-grade intrusion detection, since the heuristics are simple and will produce false positives and misses

Try asking

  • “Analyze this pcap file and summarize top talkers and protocol distribution”
  • “Check this capture for signs of a SYN flood by looking at TCP flag ratios”
  • “Look for DNS tunneling indicators in these queries based on length and entropy”
  • “Export the packet analysis findings as a JSON report”
Step-by-step guide: how to use Analyzing Network Packets with ScapyInstall, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 3 original files, the Apache-2.0 licence and an attribution note.

    analyzing-network-packets-with-scapy.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip analyzing-network-packets-with-scapy.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip analyzing-network-packets-with-scapy.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • Start with offline pcap analysis rather than live sniffing, which needs elevated privileges and authorization
  • Give the agent a specific question, such as a suspected attack type, so it focuses the analysis
  • Review the anomaly thresholds the agent uses, since simple ratios can misclassify normal busy traffic

What's inside

  • references/api-reference.md
  • scripts/agent.py
  • SKILL.md

Redistributed unmodified from mukul975/Anthropic-Cybersecurity-Skills under the Apache-2.0 licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.