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ClaudSkills / Security / ot-ics-security

Harden Iot

Category: Security  ·  Sub-category: ot-ics-security  ·  Last updated:
Harden IoT and embedded devices against firmware tampering, hardware-interface abuse, and RTOS/ICS compromise: firmware replacement, root shells on open UART or JTAG/SWD ports, unlocked bootloader consoles, default credentials, and unauthorized commands or program downloads over Modbus, DNP3, S7comm, and MQTT (MITRE ATT&CK T1542, T1542.001, T1495, T1200, T1078.001; ICS T0857, T0839, T0812, T0843, T0855, T0848). Signals: firmware and boot telemetry (verified boot, OTA signature checks, TPM attestation), device console syslog, OT network monitoring (Zeek, Mosquitto), and Microsoft Defender for IoT alerts. Gives a hunt and a hardening plan mapped to ISO 27001, NIST CSF, and the Essential Eight. Use when hardening an IoT or embedded fleet, locking down debug ports and bootloader consoles, enforcing signed firmware and secure boot, hunting unauthorized PLC program downloads or rogue Modbus writes, or triaging Defender for IoT alerts.
Security AStatic scan found no risk patternsHow grading works ›

What this skill does

Harden Iot is a community-contributed Claude Code skill in the ot-ics-security sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/harden-iot/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when hardening an IoT or embedded fleet, locking down debug ports and bootloader consoles, enforcing signed firmware and secure boot, hunting unauthorized PLC program downloads or rogue Modbus writes, or triaging Defender for IoT alerts.

Who uses this skill

The Harden Iot Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 211,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/harden-iot
curl -L https://claudskills.com/skills/harden-iot/SKILL.md \
  -o ~/.claude/skills/harden-iot/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/harden-iot/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/harden-iot/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\harden-iot\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Harden Iot Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/harden-iot/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Harden Iot skill do?
Harden IoT and embedded devices against firmware tampering, hardware-interface abuse, and RTOS/ICS compromise: firmware replacement, root shells on open UART or JTAG/SWD ports, unlocked bootloader consoles, default credentials, and unauthorized commands or program downloads over Modbus, DNP3, S7comm, and MQTT (MITRE ATT&CK T1542, T1542.001, T1495, T1200, T1078.001; ICS T0857, T0839, T0812, T0843, T0855, T0848). Signals: firmware and boot telemetry (verified boot, OTA signature checks, TPM attestation), device console syslog, OT network monitoring (Zeek, Mosquitto), and Microsoft Defender for IoT alerts. Gives a hunt and a hardening plan mapped to ISO 27001, NIST CSF, and the Essential Eight. Use when hardening an IoT or embedded fleet, locking down debug ports and bootloader consoles, enforcing signed firmware and secure boot, hunting unauthorized PLC program downloads or rogue Modbus writes, or triaging Defender for IoT alerts.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Harden Iot skill?
Use Harden Iot when your Claude Code task falls under the Security category — specifically in the ot ics security area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Harden Iot" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Harden Iot skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Harden Iot is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
umbrasec-labs. (2026). Harden Iot [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/harden-iot/
BibTeX
@misc{harden-iot-2026,
  author    = {umbrasec-labs},
  title     = {Harden Iot [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/harden-iot/}
}

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Security scan

Grade A · scanned 2026-10-25 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

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More Security skills

Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills
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