conducting-internal-network-penetration-test

conducting-internal-network-penetration-test is a skill for Claude Code from 26zl/cybersec-toolkit. It costs 45 tokens per session (3,110 once invoked), scanned A, original, MIT.

An internal network penetration-test procedure that assumes an attacker already has access to a company's private network and tries to move to other systems or gain more privileges.

In plain words
What is it for?
Use it to test lateral movement, credential theft, privilege escalation, data exposure, and internal monitoring from an assumed-breach position. It requires an agreed scope, network access, and written authorization.
Why use it?
It measures the potential damage from a compromised workstation or malicious insider, including how far an attacker could travel and what sensitive data they could reach.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: positional $N argument.

Part of the cybersec-toolkit plugin — 197 skills, 2 hooks, 1 MCP server shipped together

Good fit Use it to test lateral movement, credential theft, privilege escalation, data exposure, and internal monitoring from an assumed-breach position. It requires an agreed scope, network access, and written authorization.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/26zl/cybersec-toolkit/conducting-internal-network-penetration-test
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.

Any agent
npx skills add 26zl/cybersec-toolkit --skill conducting-internal-network-penetration-test
Clone the repo
git clone --depth 1 https://github.com/26zl/cybersec-toolkit

Made for: Claude Code.

Or install cybersec-toolkit, the plugin that ships this one along with the rest of its 197 skills, 2 hooks, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for conducting-internal-network-penetration-test

README.md
[![agentmods](https://agentmods.dev/badge/skills/26zl/cybersec-toolkit/conducting-internal-network-penetration-test/github.svg)](https://agentmods.dev/skills/26zl/cybersec-toolkit/conducting-internal-network-penetration-test)
Your own site
<a href="https://agentmods.dev/skills/26zl/cybersec-toolkit/conducting-internal-network-penetration-test"><img src="https://agentmods.dev/badge/skills/26zl/cybersec-toolkit/conducting-internal-network-penetration-test/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for conducting-internal-network-penetration-test

Your own site · 80×15
<a href="https://agentmods.dev/skills/26zl/cybersec-toolkit/conducting-internal-network-penetration-test"><img src="https://agentmods.dev/badge/skills/26zl/cybersec-toolkit/conducting-internal-network-penetration-test.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 45 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,110 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 7 findings, up to critical

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • critical YARA Match · line 212
    YARA rule matched a known malware signature (reverse shell, backdoor, ransomware, C2 framework, or info stealer).
    Fix: Remove the malware payload or compromised file entirely. Investigate how it entered the skill and audit all other artifacts for additional indicators of compromise.
  • high YARA Match · line 56
    YARA rule matched a hack tool or exploit indicator (offensive tools, reconnaissance, privilege escalation, or exploit frameworks).
    Fix: Remove offensive tool references and exploit code. Legitimate agent skills should not contain penetration testing tools, exploit frameworks, or reconnaissance utilities.
  • high YARA Match · line 223
    YARA rule matched a hack tool or exploit indicator (offensive tools, reconnaissance, privilege escalation, or exploit frameworks).
    Fix: Remove offensive tool references and exploit code. Legitimate agent skills should not contain penetration testing tools, exploit frameworks, or reconnaissance utilities.
  • high YARA Match · line 266
    YARA rule matched a known malware signature (reverse shell, backdoor, ransomware, C2 framework, or info stealer).
    Fix: Remove the malware payload or compromised file entirely. Investigate how it entered the skill and audit all other artifacts for additional indicators of compromise.
  • medium YARA Match · line 73
    YARA rule matched a hack tool or exploit indicator (offensive tools, reconnaissance, privilege escalation, or exploit frameworks).
    Fix: Remove offensive tool references and exploit code. Legitimate agent skills should not contain penetration testing tools, exploit frameworks, or reconnaissance utilities.
  • medium Privilege Escalation · line 144
    Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.
    Fix: Avoid sudo/root unless strictly required. Prefer least-privilege patterns. If elevation is needed, document the justification and scope.
  • medium Privilege Escalation · line 150
    Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.
    Fix: Avoid sudo/root unless strictly required. Prefer least-privilege patterns. If elevation is needed, document the justification and scope.
How audits are shown
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 5.1 $0.00045 $0.03110
Opus 5 $0.00023 $0.01555
Sonnet 5 $0.00009 $0.00622
Haiku 4.5 $0.00005 $0.00311

Measured 8d ago against content hash b8ee89434c59, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

conducting-internal-network-penetration-test scanned grade A 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 8d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/agent.py, scripts/process.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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 rootlowPrivilege escalation

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

sudo responder -I eth0 -dwPv

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

.claude/skills/conducting-internal-network-penetration-test/SKILL.md · 315 lines

How it starts

The opening of the file, as written. The whole thing — 315 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Conducting Internal Network Penetration Test

Overview

An internal network penetration test simulates an attacker who has already gained access to the internal network or a malicious insider. The tester operates from an "assumed breach" position — typically a standard domain workstation or network jack — and attempts lateral movement, privilege escalation, credential harvesting, and data exfiltration to determine the blast radius of a compromised endpoint.

When to Use

  • When conducting security assessments that involve conducting internal network penetration test
  • When following incident response procedures for related security events
  • When performing scheduled security testing or auditing activities
  • When validating security controls through hands-on testing

Prerequisites

  • Signed Rules of Engagement with internal network scope
  • Network access: physical Ethernet drop or VPN connection to internal VLAN
  • Standard domain user credentials (assumed breach model) or unauthenticated access
  • Testing laptop with Kali Linux, Impacket, Responder, BloodHound
  • Coordination with IT/SOC for monitoring and emergency contacts

Legal Notice: This skill is for authorized security testing and educational purposes only. Unauthorized use against systems you do not own or have written permission to test is illegal and may violate computer fraud laws.

Phase 1 — Network Discovery and Enumeration

Initial Network Reconnaissance

# Identify your own network position
ip addr show
ip route show
cat /etc/resolv.conf

# ARP scan for live hosts on local subnet
arp-scan --localnet --interface eth0

# Nmap host discovery across internal ranges
nmap -sn 10.0.0.0/8 --exclude 10.0.0.1 -oG internal_hosts.gnmap
nmap -sn 172.16.0.0/12 -oG internal_hosts_172.gnmap
nmap -sn 192.168.0.0/16 -oG internal_hosts_192.gnmap

# Extract live hosts
grep "Status: Up" internal_hosts.gnmap | awk '{print $2}' > live_hosts.txt

# Port scan live hosts — top 1000 ports
nmap -sS -sV -T4 -iL live_hosts.txt -oA internal_tcp_scan

# Service-specific scans
nmap -p 445 --open -iL live_hosts.txt -oG smb_hosts.gnmap
nmap -p 3389 --open -iL live_hosts.txt -oG rdp_hosts.gnmap
nmap -p 22 --open -iL live_hosts.txt -oG ssh_hosts.gnmap
nmap -p 1433,3306,5432,1521,27017 --open -iL live_hosts.txt -oG db_hosts.gnmap

Read the full file on GitHub · 315 lines

Files

What ships with it

7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 8d ago First seen · 315 lines · 45 tokens per session scan A b8ee89434c59

Subscribe to this mod's changes

conducting-internal-network-penetration-test is a skill published in the GitHub repository 26zl/cybersec-toolkit (54 stars, last pushed today), licensed MIT. It adds 45 tokens to every session and 3,110 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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