Monitor SSL certificates for brand-impersonating domains with crt.sh, Urlscan.io and Slack

Phishing Lookout (Typosquatting) and Brand Domain Monitor This workflow monitors SSL certificate logs to find and scan new domains that might be impersonating your brand.

Background In modern cybersecurity, Brand Impersonation (or "Typosquatting") is quite common in phishing attacks. Attackers register domains that look nearly identical to a trusted brand—such as .input-n8n.io, n8n.i0, etc. instead of the legitimate— to deceive users into revealing sensitive credentials or downloading malware.

How it works Monitor: Checks crt.sh every hour for new SSL certificates matching your brand keywords.

Process: Uses a Split Out node to handle multi-domain certificates and a Filter node to ignore your own legitimate domains bringing only most recent certificates.

Scan: Automatically sends suspicious domains to Urlscan.io for a headless browser scan and screenshot.

Loop & Triage: Implements a 30-second Wait to allow the scan in loop to finish before fetching results.

Alert: Sends a Slack message with the domain name, report link, and an image of the supposedly suspicious site trying to mimic your site login page, etc. alerting potentially a phishing case.

Setup Steps Credentials: Connect your Urlscan.io API key and Slack bot token.