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Adding some Automation to the favicon.ico method of Host Recon, (Mon, Jun 29th)

ID: 602cbfb3-9c5a-53a5-8d2f-92fc2ee4e082

STIX ID: report--602cbfb3-9c5a-53a5-8d2f-92fc2ee4e082

Feed Name: SANS ISC Diary

Date Published: 2026-06-29

Date Updated: 2026-07-02

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This post demonstrates a reconnaissance workflow that computes an mmh3/base64 hash of a site's favicon.ico, queries Shodan for matching favicons to discover additional hostnames, extracts hostnames via jq, filters and deduplicates them, and then scans resolved IPs with nmap/masscan to enumerate open ports; the author reports 363 hostnames resolving to 373 IPs and 5,091 open TCP ports while noting some false positives and potential honeypots.

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