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mukul975
cb8d79e068
- Add validated mitre_attack frontmatter to all 754 skills (286 distinct techniques), verified against MITRE ATT&CK v19.1 via the official mitreattack-python library: 0 revoked, deprecated, or invalid IDs - Curate precise per-skill technique IDs for forensics, malware-analysis, threat-intel, and red-team skills (e.g. DCSync -> T1003.006, Kerberoasting -> T1558.003, Pass-the-Ticket -> T1550.003) - Reconcile v19.1 tactic restructuring: Defense Evasion split into Stealth (TA0005) and Defense Impairment (TA0112); revoked T1562.* family and T1070.001/.002 remapped to active equivalents (T1685.*) - Normalize word-split tags across 35 skills (remove filename-derived stopword tags, add semantic cybersecurity tags) - Add api-reference.md for 3 skills that were missing it - Update README ATT&CK section with accurate v19.1 tactic distribution
64 lines
2.3 KiB
Markdown
64 lines
2.3 KiB
Markdown
---
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name: analyzing-network-packets-with-scapy
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description: Craft, send, sniff, and dissect network packets using Scapy for protocol
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analysis, network reconnaissance, and traffic anomaly detection in authorized security
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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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