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noahfranklinnoahfranklin/gideon/skills/recon-osint/SKILL.md

recon-osint

Skill2 starsChanged 48 days agoMITView on GitHub

Use at the start of any authorized red-team or pentest engagement to map the target's attack surface — passive OSINT (domains, subdomains, certs, DNS, ASN/IP ranges, leaked credentials, employees, tech stack) and active recon (port/service discovery, web asset enumeration). Produces a scoped attack-surface inventory feeding the domain-specific pentest skills. Authorized engagements only.

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SKILL.md

Reconnaissance & OSINT

The first phase of every engagement: understand the target's real attack surface before touching it hard. Passive recon leaves no footprint on the target; active recon interacts and must stay strictly in scope.

0. Authorization gate

  • Written scope: in-scope domains, IP ranges/ASNs, cloud accounts, apps.
  • Explicit out-of-scope assets and third parties (never recon a provider you aren't cleared for).
  • Rules on active scanning (rate, hours, allowed tooling).
  • OSINT-on-people rules (many programs restrict employee targeting).

1. Passive OSINT (no target interaction)

  • Domains & subdomains: certificate transparency logs, passive DNS, subdomain enumeration from public sources; brand/typo domains.
  • IP/ASN footprint: ASN lookups, netblock ownership, cloud IP attribution.
  • DNS records: A/AAAA/MX/TXT/SPF/DMARC/CNAME; zone data from public sources.
  • Tech fingerprinting: frameworks, CDNs, WAFs, versions from public pages/headers.
  • Exposure: public code repos, cloud storage buckets, exposed dashboards, internet-scan datasets, paste sites.
  • People & creds: employees/roles, email formats, breach-corpus credential exposure (for spray/reuse testing when in scope).
  • Documents/metadata: public files and their metadata (authors, software, internal paths).

2. Active recon (in-scope interaction)

  • Host discovery: which in-scope hosts are alive.
  • Port/service scanning: TCP/UDP, service + version detection; note rate limits.
  • Web asset enumeration: virtual hosts, directories, endpoints, API specs, JS-referenced routes.
  • Screenshotting web services at scale to triage quickly.

3. Common tooling

Amass / subfinder / assetfinder, dnsx, httpx, nmap / masscan / naabu, nuclei (for known-CVE triage), gowitness/aquatone, theHarvester, cloud-attribution tooling. Prefer the RoE-approved set; respect rate limits.

4. Output: the attack-surface inventory

Produce a living inventory that feeds the domain skills:

AssetType (web/api/host/cloud)Tech/versionAuth surfacePriorityFeeds skill

Prioritize by exposure × likely impact. Hand web assets to web-app-pentest, APIs to api-security-audit, hosts to network-pentest, cloud to cloud-pentest/entra-cloud-pentest, mobile to mobile-pentest.

5. Blue-team note (remediation value)

Recon findings are attack-surface-reduction wins: retire stale subdomains/hosts, fix DNS hygiene (SPF/DMARC), remove exposed storage/dashboards, rotate leaked credentials, and monitor cert transparency for rogue domains.

See references/recon-checklist.md.


<sub>© 2026 noahfranklin · Part of the Gideon security suite · MIT License · Original work.</sub>

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