Open source intelligence techniques for CTF challenges using public data sources.
Works with
Covers social media OSINT (Twitter/X user tracking, Tumblr investigation, BlueSky API, Discord), username enumeration across 741+ platforms, and Unicode homoglyph steganography detection
Includes geolocation methods: reverse image search, Street View panorama matching, road sign OCR, MGRS/Plus Code conversion, and infrastructure mapping via OpenRailwayMap
Provides web reconnaissance: Google dorking with
AI-first code editor with Composer
Before installing skills in Cursor, ensure your development environment meets these requirements:
node --versionctf-osintExecute the skills CLI command in your project's root directory to begin installation:
Fetches ctf-osint from ljagiello/ctf-skills and configures it for Cursor.
The CLI shows a list of agents. Use arrow keys and space to select Cursor:
Confirm successful installation by checking the skill directory location:
Restart Cursor to activate ctf-osint. Access via /ctf-osint in your agent's command palette.
We perform automated surface-level scans (Gen AI Scanner, Socket, Snyk) during installation. These checks detect common vulnerabilities but do not guarantee complete security. Always review skill source code and verify the publisher's reputation before production use.
Skills execute code in your environment. Always review source, verify the publisher, and test in isolation before production.
Submit your Claude Code skill and start earning
Create detailed user stories, acceptance criteria, and feature specs
Example
Generate user stories for 'password reset feature' with acceptance criteria, edge cases, and test scenarios
Reduce spec writing time by 50%, ensure comprehensive coverage
Research competitors, compare features, identify gaps
Example
Analyze 5 competitor products, create feature comparison matrix, suggest differentiation opportunities
Complete competitive research in 2 hours instead of 2 days
Evaluate features using frameworks (RICE, ICE, Kano) and create prioritized backlogs
Example
Score 20 feature ideas using RICE framework, generate prioritized roadmap with rationale
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Quick reference for OSINT CTF challenges. Each technique has a one-liner here; see supporting files for full details.
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
/ctf-forensics./ctf-web./ctf-malware.# DNS recon
dig -t any target.com
dig -t txt target.com
dig axfr @ns.target.com target.com
whois target.com
# Image metadata
exiftool image.jpg
identify -verbose image.jpg | head -30
# Web archive
curl "https://web.archive.org/web/20230101*/target.com"
# Username lookup
curl -s "https://whatsmyname.app/api/lookup?username=<user>"
# Shodan
shodan search "hostname:target.com"
shodan host <ip>
https://x.com/i/user/<id> works even after renames.(id >> 22) + 1288834974657 = Unix ms.curl -sI for x-tumblr-user header. Avatar at /avatar/512. See social-media.md.XXXX+XXX (chars: 23456789CFGHJMPQRVWX). Drop a pin on Google Maps → Plus Code appears in details. Free, no API key needed. See geolocation-and-media.md.exiftool image.jpg # EXIF data
pdfinfo document.pdf # PDF metadata
mediainfo video.mp4 # Video metadata
site:example.com filetype:pdf
intitle:"index of" password
Image TBS filters: Append &tbs=itp:face to Google Image URLs to filter for faces only (strips logos/banners). See web-and-dns.md.
/export?format=csv, /pub, /gviz/tq?tqx=out:csv, /htmlview. See web-and-dns.md.dig -t txt subdomain.ctf.domain.com
dig axfr @ns.domain.com domain.com # Zone transfer
Always check TXT, CNAME, MX for CTF domains. See web-and-dns.md.
https://metrics.torproject.org/rs.html#simple/<FINGERPRINT> -- check family, sort by "first seen". See web-and-dns.md.gh api. See web-and-dns.md./start, answer verification questions. See web-and-dns.md.curl "http://ip-api.com/json/103.150.68.150"
Pattern: Visually-identical Unicode characters from different blocks (Cyrillic, Greek, Math) encode binary data in social media posts. ASCII = 0, homoglyph = 1. Group bits into bytes for flag. See social-media.md.
No auth needed. Endpoints: public.api.bsky.app/xrpc/app.bsky.feed.searchPosts?q=..., app.bsky.actor.searchActors, app.bsky.feed.getAuthorFeed. Check all replies to official posts. See social-media.md.
Pattern: Port appears open on a standard service port (22/SSH, 80/HTTP) but runs a fake service. nmap -sV or nc host port reveals the flag in the banner. Never trust port numbers alone -- always fingerprint the service. See web-and-dns.md.
Search Shodan by SSH host key fingerprint to identify servers: shodan search "fingerprint:AA:BB:CC:...". See web-and-dns.md.
Lookup usernames across gaming platforms (Steam, Xbox, PSN, MMOs) for character profiles, activity, and linked accounts. See social-media.md.
Make data-driven prioritization decisions faster
Draft PRDs, status updates, and stakeholder presentations
Example
Create executive summary of Q3 roadmap, monthly progress report, feature launch announcement
Save 3-5 hours/week on communication overhead
Prerequisites
Time Estimate
30-60 minutes to see productivity improvements
Steps
Common Pitfalls
✓ Do
✗ Don't
💡 Pro Tips
✓ Use when
Use for user story writing, competitive research, roadmap prioritization, stakeholder communication, and PRD drafting. Best for reducing repetitive documentation and research work.
✗ Avoid when
Avoid for strategic product vision (requires deep customer empathy), pricing decisions (needs market and financial expertise), or when face-to-face customer discovery is more valuable than speed.
mattpocock/skills
parcadei/continuous-claude-v3
cursor/plugins
ailabs-393/ai-labs-claude-skills
pproenca/dot-skills
mattpocock/skills
Keeps context tight: ctf-osint is the kind of skill you can hand to a new teammate without a long onboarding doc.
ctf-osint has been reliable in day-to-day use. Documentation quality is above average for community skills.
Keeps context tight: ctf-osint is the kind of skill you can hand to a new teammate without a long onboarding doc.
Solid pick for teams standardizing on skills: ctf-osint is focused, and the summary matches what you get after install.
ctf-osint is among the better-maintained entries we tried; worth keeping pinned for repeat workflows.
Keeps context tight: ctf-osint is the kind of skill you can hand to a new teammate without a long onboarding doc.
We added ctf-osint from the explainx registry; install was straightforward and the SKILL.md answered most questions upfront.
ctf-osint fits our agent workflows well — practical, well scoped, and easy to wire into existing repos.
Keeps context tight: ctf-osint is the kind of skill you can hand to a new teammate without a long onboarding doc.
ctf-osint is among the better-maintained entries we tried; worth keeping pinned for repeat workflows.
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