attack-surface-recon

Original：🇺🇸 English

Translated

Map an organization's external attack surface — domains, subdomains, exposed services, leaked credentials, and brand abuse. Use at the start of assessments or for continuous monitoring.

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Sourcesecurityskills/skills

Added on2026-10-10

NPX Install

npx skill4agent add securityskills/skills attack-surface-recon

SKILL.md Content

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Attack Surface Recon

Build a complete external attack-surface picture from public sources.

1. Root Domain Discovery

Start from known brands/domains; expand via certificate transparency (crt.sh), ASN lookups, WHOIS reverse lookups, acquisition history
Identify cloud ranges: enumerate owned netblocks (bgp.he.net, ipinfo)

2. Subdomain Enumeration

Passive sources: CT logs, DNS datasets (SecurityTrails-style), web archives
Active: DNS bruteforce, permutation generation (alterations of known hosts:
```
-dev
```
,
```
-staging
```
,
```
-old
```
)
Resolve; probe HTTP(S) for live services; fingerprint technologies (httpx/wappalyzer)

3. Exposed Services

Port scan in-scope IPs (top ports minimum, full range on high-value hosts)
Flag: exposed admin panels, databases (3306/5432/27017), RDP/SMB, Redis/Memcached, Kubernetes API, VPN portals, file shares
Takeover checks: dangling CNAMEs pointing at deprecated cloud services

4. Credential and Code Leaks

Breach data for corporate domains (report presence; never view more than proof)
Public code search (GitHub/gists) for org domains, tokens, internal hostnames in commits
Exposed storage: open S3 buckets/azure blobs matching org naming patterns

5. People and Brand

Employee enumeration via LinkedIn for phishing-simulation scoping (policy permitting)
Lookalike domains registered recently (typosquats), abuse of brand in app stores

Rules

Passive sources preferred; active scanning only within authorization
Found leaked credentials: report immediately, do not log in with them

Output

Ranked asset inventory: exposed services by risk, credential leak notifications, takeover-prone records, and monitoring recommendations.