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Mahipal
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Each rewritten description now states both what the skill does (concrete capability, named tools/artifacts) and an explicit when-to-use trigger, improving agent discovery/activation. Grounded in each skill's own body; changes confined to the `description` field only (bodies and all other frontmatter untouched). Produced by a gated audit->rewrite->recheck loop (548 -> 0 flagged) with a sampled anti-invention check (0 ungrounded). Schema: 817/817 pass. Framework-ID gate: 0 defects.
62 lines
2.4 KiB
Markdown
62 lines
2.4 KiB
Markdown
---
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name: analyzing-network-packets-with-scapy
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description: Use Scapy to craft, send, sniff, and dissect TCP/UDP/ICMP/DNS packets, analyze pcap files, implement SYN scans, and detect anomalous traffic such as fragmented or malformed packets. Use when performing authorized network reconnaissance, protocol-level forensic analysis, or building traffic anomaly detection during security testing.
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domain: cybersecurity
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subdomain: network-security
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tags:
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- scapy
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- packet-analysis
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- network-forensics
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- protocol-dissection
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- pcap
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- traffic-analysis
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version: '1.0'
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author: mahipal
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license: Apache-2.0
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nist_csf:
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- PR.IR-01
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- DE.CM-01
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- ID.AM-03
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- PR.DS-02
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mitre_attack:
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- T1040
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- T1071
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- T1046
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- T1557
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---
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# Analyzing Network Packets with Scapy
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## Overview
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Scapy is a Python packet manipulation library that enables crafting, sending, sniffing, and dissecting network packets at granular protocol layers. This skill covers using Scapy for security-relevant tasks including TCP/UDP/ICMP packet crafting, pcap file analysis, protocol field extraction, SYN scan implementation, DNS query analysis, and detecting anomalous traffic patterns such as unusually fragmented packets or malformed headers.
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## When to Use
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- When investigating security incidents that require analyzing network packets with scapy
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- When building detection rules or threat hunting queries for this domain
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- When SOC analysts need structured procedures for this analysis type
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- When validating security monitoring coverage for related attack techniques
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## Prerequisites
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- Python 3.8+ with `scapy` library installed (`pip install scapy`)
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- Root/administrator privileges for raw socket operations (sniffing, sending)
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- Npcap (Windows) or libpcap (Linux) for packet capture
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- Authorization to perform packet operations on target network
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## Steps
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1. Read and parse pcap/pcapng files with `rdpcap()` for offline analysis
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2. Extract protocol layers (IP, TCP, UDP, DNS, HTTP) and field values
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3. Compute traffic statistics: top talkers, protocol distribution, port frequency
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4. Detect SYN flood patterns by analyzing TCP flag ratios
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5. Identify DNS exfiltration indicators via query length and entropy analysis
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6. Craft custom probe packets for authorized network testing
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7. Export findings as structured JSON report
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## Expected Output
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JSON report containing packet statistics, protocol distribution, top source/destination IPs, detected anomalies (SYN floods, DNS tunneling indicators, fragmentation attacks), and per-flow summaries.
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