performing-subdomain-enumeration-with-subfinder
Installation
SKILL.md
Performing Subdomain Enumeration with Subfinder
When to Use
- During the reconnaissance phase of penetration testing or bug bounty hunting
- When mapping the external attack surface of a target organization
- Before performing vulnerability scanning on discovered subdomains
- When building an asset inventory for continuous security monitoring
- During red team engagements requiring passive information gathering
Prerequisites
- Go 1.21+ installed for building from source
- Subfinder v2 installed (
go install -v github.com/projectdiscovery/subfinder/v2/cmd/subfinder@latest) - API keys configured for passive sources (Shodan, Censys, VirusTotal, SecurityTrails, Chaos)
- Provider configuration file at
$HOME/.config/subfinder/provider-config.yaml - Network access to passive DNS and certificate transparency sources
- httpx or httprobe for validating discovered subdomains
Workflow
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