ctf-osint

ctf-osint is a skill for Claude Code from SeaOf0/dsh-redteam-model. It costs 65 tokens per session (2,313 once invoked), scanned A, a copy of ctf-osint, MIT.

A reference for open-source intelligence, meaning information gathered from public sources, during capture-the-flag security challenges.

In plain words
What is it for?
Use it for tasks involving usernames, social media, websites, DNS, images, locations, metadata, archives, hashes, coordinates, and other public clues.
Why use it?
It organizes many investigation techniques so you can trace clues without relying on one type of public data.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions Claude Code.

Good fit Use it for tasks involving usernames, social media, websites, DNS, images, locations, metadata, archives, hashes, coordinates, and other public clues.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/seaof0/dsh-redteam-model/ctf-osint
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 SeaOf0/dsh-redteam-model --skill ctf-osint
Clone the repo
git clone --depth 1 https://github.com/SeaOf0/dsh-redteam-model

Made for: Claude Code.

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 ctf-osint

README.md
[![agentmods](https://agentmods.dev/badge/skills/seaof0/dsh-redteam-model/ctf-osint/github.svg)](https://agentmods.dev/skills/seaof0/dsh-redteam-model/ctf-osint)
Your own site
<a href="https://agentmods.dev/skills/seaof0/dsh-redteam-model/ctf-osint"><img src="https://agentmods.dev/badge/skills/seaof0/dsh-redteam-model/ctf-osint/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 ctf-osint

Your own site · 80×15
<a href="https://agentmods.dev/skills/seaof0/dsh-redteam-model/ctf-osint"><img src="https://agentmods.dev/badge/skills/seaof0/dsh-redteam-model/ctf-osint.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 65 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,313 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.
Origin 100% copy Near-identical to another mod 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 $0.00065 $0.02313
Opus 5 $0.00032 $0.01156
Sonnet 5 $0.00013 $0.00463
Haiku 4.5 $0.00006 $0.00231

Measured 10d ago against content hash a78f55e0162d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

ctf-osint 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 10d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

apt install whois dnsutils nmap libimage-exiftool-perl imagemagick curl
Origin

This is a copy

100% identical to ctf-osint — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

modes/ctf-solver/refs/ctf-osint/SKILL.md · 193 lines

How it starts

The opening of the file, as written. The whole thing — 193 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CTF OSINT

Quick reference for OSINT CTF challenges. Each technique has a one-liner here; see supporting files for full details.

Prerequisites

Python packages (all platforms):

pip install shodan Pillow

Linux (apt):

apt install whois dnsutils nmap libimage-exiftool-perl imagemagick curl

macOS (Homebrew):

brew install whois bind nmap exiftool imagemagick curl

Additional Resources

  • social-media.md - Twitter/X (user IDs, Snowflake timestamps, Nitter, memory.lol, Wayback CDX), Tumblr (blog checks, post JSON, avatars), BlueSky search + API, Unicode homoglyph steganography, Discord API, username OSINT (namechk, whatsmyname, Osint Industries), username metadata mining (postal codes), platform false positives, multi-platform chains, Strava fitness route OSINT
  • geolocation-and-media.md - Image analysis, reverse image search (including Baidu for China), Google Lens cropped region search, reflected/mirrored text reading, geolocation techniques (railroad signs, infrastructure maps, MGRS), Google Plus Codes, EXIF/metadata, hardware identification, newspaper archives, IP geolocation, Google Street View panorama matching, What3Words micro-landmark matching, Google Maps crowd-sourced photo verification, Overpass Turbo spatial queries, music-themed landmark geolocation with key encoding
  • web-and-dns.md - Google dorking (including TBS image filters), Google Docs/Sheets enumeration, DNS recon (TXT, zone transfers), Wayback Machine, FEC research, Tor relay lookups, GitHub repository analysis, Telegram bot investigation, WHOIS investigation (reverse WHOIS, historical WHOIS, IP/ASN lookup), fake service banner detection via nmap fingerprinting

When to Pivot

  • If you already have the files or packets locally and now need extraction or carving, switch to /ctf-forensics.
  • If the task becomes active exploitation of a live HTTP service, switch to /ctf-web.
  • If you uncover malware samples, beacons, or suspicious binaries during attribution, switch to /ctf-malware.

Read the full file on GitHub · 193 lines

Files

What ships with it

3 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. 10d ago First seen · 193 lines · 65 tokens per session scan A a78f55e0162d

Subscribe to this mod's changes

ctf-osint is a skill published in the GitHub repository SeaOf0/dsh-redteam-model (354 stars, last pushed yesterday), licensed MIT. It adds 65 tokens to every session and 2,313 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to ctf-osint, differing in 0 lines, and is treated as a copy.